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Proceedings of the 4th International Symposium on Ceramic Materials and Components for Engines : held at Göteborg, Sweden, 10-12 June 1991

معرفی کتاب «Proceedings of the 4th International Symposium on Ceramic Materials and Components for Engines : held at Göteborg, Sweden, 10-12 June 1991» نوشتهٔ R.L. Carlson; T. Johansson; Lars Kahlman، منتشرشده توسط نشر Springer Netherlands : Imprint : Springer در سال 1992. این کتاب در فرمت pdf، زبان انگلیسی ارائه شده است.

Front Matter ....Pages i-xix EC-Adventure in Mobility (Ivo Dubois)....Pages 1-7 The Study of a Heat Insulated Engine Constructed by Ceramics Engine Parts (Hideo Kawamura)....Pages 8-31 Prospects for Ceramics in Airborne Gas Turbine Engines (E. G. Butler, M. H. Lewis)....Pages 32-49 Metal Ceramic Joining for High Temperature Applications (Lars Pejryd)....Pages 50-66 Mass Production of Ceramic Portliners for Piston Engines (Jürgen Heinrich)....Pages 67-83 The Influence of Fibers, Matrices, and Interfaces on the Properties of Ceramic Matrix Composites (John J. Brennan, James R. Strife, Karl M. Prewo)....Pages 84-117 Ceramics for Reciprocating Engines: An Application Review (H. Takao, A. Okada, M. Ando, Y. Akimune, N. Hirosaki)....Pages 118-133 Material and Lubricant Relationships in the Tribology of Internal Combustion Engines (C. S. Yust)....Pages 134-148 Microstructure of Silicon Carbide After Plasma Sintering (Kazunori Kijima)....Pages 149-156 Oxynitride Glass Systems and Subsequent Glass-Ceramic Heat Treatments (S. Hampshire, R. Flynn, J. Lonergan, A. O’Riordan)....Pages 157-164 Tem Studies of SRBSN with Unstabilized ZrO2 Additions (H.-J. Kleebe, W. Braue, W. Luxem, M. Rühle)....Pages 165-171 High-Temperature Reactions in the B-Al-Si-N-C System (R. J. Oscroft, D. P. Thompson)....Pages 172-179 Characterization of Pressureless Sintered Alpha SiC by Advanced Techniques of Scanning Electron Microscopy and X-Ray Diffraction (A. Camanzi, B. A. De Angelis, G. Giunta, S. Loreti, C. Rizzo, P. Alessandrini)....Pages 180-187 Microstructure and Properties of Mixed α’+β’-Sialons (G. Z. Cao, R. Metselaar, G. Ziegler)....Pages 188-195 High-Pressure Carbothermal Preparation of Si3N4. Influence of Temperature Program and Additives. (M. Ekelund, B. Forslund)....Pages 196-203 Thermal Expansion of Diboride Solid Solutions (E. Fendler, O. Babushkin, T. Lindbäck, R. Telle, G. Petzow)....Pages 204-212 Synthesis of AlN Powder by Carbothermal Nitridation of Al2O3 at Elevated N2 Pressures (B. Forslund, J. Zheng)....Pages 213-220 High Temperature Properties and Microstructures of Si3N4 with AZ-Type Non-Toxic, Non-Oxide Additives (Ge Changchun, Xia Yuanluo, Chen Limin, Yuan Yi)....Pages 221-228 Nd-Ce-TZP Powders and Ceramics: Hydrothermal Preparation of High Quality Powders from Sulphate Precursors (Laila Grahl-Madsen, Nanna Petersen, Kathryn Warner, Jesper Sand Damtoft, John Engell)....Pages 229-236 Microstructure and Mechanical Properties of Sintered Reaction Bonded Silicon Nitride (SRBSN) (M. Herrmann, S. Kessler, Ch. Taut, G. A. Gogotsi, V. P. Zavada)....Pages 237-243 Effect of Intergranular Microstructure on Properties of Si3N4 Based Composite Ceramic Materials (E. Maria Knutson-Wedel, Lena K. L. Falk, Tommy Ekström)....Pages 244-251 The Microstructure and the Oxidation Behaviour of Si2N2O/Zro2 Composites (Colette O’Meara)....Pages 252-259 Surface Acid-Base, and Electrokinetic Properties of Si3N4, ZrO2, Al2O3, Y2O3, and TiO2 Powders (Alf B. A. Pettersson, Hedvig Byman-Fagerholm, Jarl B. Rosenholm)....Pages 260-268 Structural Details of Sialons — Their Influence on Phase Stability (Jörgen Sjöberg, Robert Pompe)....Pages 269-276 The Microstructure Control in the Sol-Gel Derived Alumina-Zirconia Composite (V. Srdić, L. Radonjić)....Pages 277-283 Interfaces in Ceramic Matrix Composites Following High Temperature Deformation (Håkan A. Swan, Colette O’Meara, Gordon L. Dunlop)....Pages 284-291 Phase Relationships of α′, β′-Sialons in the Y,Si,Al/N,O System and Design of Sialon Composite Materials (W. Y. Sun, L. J. Tong, T. S. Yen)....Pages 292-299 Effect of ZrO2 on the Crystallization of Grain Boundary Glassy Phase in Sintered Silicon Nitride (J. Zhao, L. Wang, G. Peng, J. G. Wu)....Pages 300-306 The Influence of Pre-Oxidation on the Processing of Silicon Powder (R. G. Stephen, F. L. Riley)....Pages 307-314 An Oxidation Resistant Al2O3-TiO2 Sintered Silicon Nitride (D. N. Ovreboe, S. K. Biswas, F. Castro, F. L. Riley)....Pages 315-323 A Brazed Ceramic-to-Metal Joint in a Car Engine Tappet (I. A. Bucklow, S. B. Dunkerton, W. G. Hall, B. Chardon)....Pages 324-331 Joining of Silicon Nitride Ceramics (M. G. Nicholas, S. D. Peteves)....Pages 332-339 Diffusion Bonding of Si3N4/TiN and Si3N4/TiB2 Composites to Incology 909 (Richard Larker, Liu-Ying Wei, Mikael Olsson, Bengt Loberg)....Pages 340-347 Application of Ceramic-Metal Eutectics for Solid-State Bonding Between Ceramics (Stanislaw Serkowski)....Pages 348-355 Fe-TiC/N Ceramic-Metal Composites (I. W. M. Brown, G. V. White, G. L. Dunlop)....Pages 356-363 Wetting and Interactions Between Selected Ceramics and Ni-Base Braze Alloys (M. Holmström, L. Ljungberg, A. Warren, R. Warren)....Pages 364-371 CMZP — A New High Temperature Thermal Barrier Material (D. A. Hirschfeld, D. M. Liu, J. J. Brown)....Pages 372-380 Microstructure and Mechanical Properties of ZrO2 Toughened Mullite Synthesized by Sol-Gel Method (M. G. M. U. Ismail, H. Shiga, K. Katayama, Z. Nakai, T. Akiba, S. Somiya)....Pages 381-388 Sintering and Characteristics of Electroconductive Al2O3-Based Composites (Alida Bellosi, Gian Nicola Babini)....Pages 389-396 Fabrication and Characterization of Slip-Cast Layered Al2O3-ZrO2 Composites (Raymond A. Cutler, Charla B. Brinkpeter, Anil V. Virkar, Dinesh K. Shetty)....Pages 397-408 Laser Assisted Plasma Coating for Carbon Matrix Composites (S. Sasaki, H. Shimura, K. Hasegawa, K. Hirano)....Pages 409-415 SiC-Si 3N4 Gradient Composite Ceramics by Special Hip Processing (Jiang Dongliang, She Jihong, Tan Shouhong, Guo Jingkun, Peter Greil)....Pages 416-423 Novel α′/β′ Sialon Ceramics (C. A. Jasper, M. H. Lewis)....Pages 424-431 Yttria Doped Si2N2O Ceramics (T. Ekström, M. Holmström, P.-O. Olsson)....Pages 432-439 Mechanical Properties of Gas Pressure Sintered Silicon Nitride (Cornelia Boberski, Rainer Hamminger)....Pages 440-450 Static and Cyclic Fatigue Behavior of Gas Pressure Sintered Silicon Nitride (Satoshi Iio, Tomonori Niwa, Yo Tajima, Masakazu Watanabe)....Pages 451-458 Mechanical Properties and Microstructure of Pressureless Sintered Duophase Sialon (Ran-Rong Lee, Bruce E. Novich, George Franks, Debbie Ouellette, Mattison K. Ferber, Camden R. Hubbard et al.)....Pages 459-467 Cyclic Fatigue of Silicon Nitrides and a Whisker-Reinforced Silicon Nitride (T. A. Mäntylä, A.-P. Nikkilä, P. T. Vuorinen, M. Enoki, T. Kishi)....Pages 468-475 Mechanical Properties of Ce-TZP/Al2O3 Ceramics with Small TiO2 Additions (Senfeng Chen, YiYuan Wu, JianDong Ye, ShaoTang Zhao)....Pages 476-482 Superplastic Deformation of α′-Sialon (J. Gerretsen, J. P. G. M. van Eijk, P. R. Put)....Pages 483-490 Determination of Subcritical Crack Growth Threshold in Ceramics with Indentation Flaws (J. H. Gong, Z. D. Guan)....Pages 491-497 Delayed Failure of Hot Isostatic Pressed Silicon Nitride at High Temperatures (Anders Micski, Bill Bergman)....Pages 498-506 Comparison Between Impact and Hertzian Indentation on Glass (Jonas Persson, David J. Rowcliffe, Kristin Breder)....Pages 507-515 Testing of Engineering Ceramics under Biaxial Loading (Ewald Staskewitsch, Klemens Stiebler, Andreas Burblies, Remanuel Arone)....Pages 516-523 Toughening Investigation of Mode III Crack by Holographic Interference Technique (Sun Qing-Ping, Huang Yong, Lin Shu-Tian, Si Wen-Jie)....Pages 524-528 Mechanical Properties and Microstructure of ZrO2/ Si3N4 Composite (Baoqing Zhang, Jiemo Tian, Xiaohua Tong, Limin Dong, Lingling Wang)....Pages 529-535 The Characteristic Stress between Two Kinds of Delayed Failure for Ceramics at Elevated Temperature (Z. D. Guan, J. H. Gong, Y. Y. Zhao, X. F. Zhao)....Pages 536-543 Fast Catalytic Debinding of Injection Moulded Parts (J. H. H. Ter Maat, J. Ebenhöch, H.-J. Sterzel)....Pages 544-551 Advanced Processing of Silicon Nitride Ceramics (J. T. Neil, S. Natansohn, A. E. Pasto)....Pages 552-560 Ceramized Injection Moulding Machine for Contamination Free Preforming (J. O. H. Nilsson, H. T. Larker)....Pages 561-568 The Causes and Prevention of Injection Moulding Defects in Large Ceramic Sections (T. Zhang, J. R. G. Evans)....Pages 569-576 The Effect of Cleanroom Processing on the Properties of Silicon Nitride (H. Schubert)....Pages 577-583 Self-Reinforced Silicon Nitride — A new Microengineered Ceramic (Aleksander J. Pyzik, Daniel F. Carroll, C. James Hwang, Arthur R. Prunier)....Pages 584-593 Development of β-Si3N4 for Self-Reinforced Composites (Dale E. Wittmer, Dilip Doshi, Thomas E. Paulson)....Pages 594-602 Sinter-Canning for Hip-Processing of Silicon Nitride (Horst Wedemeyer, Hans-Joachim Ritzhaupt-Kleissl, Elmar Günther)....Pages 603-608 SiC Dispersoid — Reinforced Si3N4 Composites (S. M. Ketchion, G. Leng - Ward, M. H. Lewis)....Pages 609-616 Investigation on the Synthesis Process and Characteristics of Si3N4 Powders and Whiskers Made from Imide (Ge Changchun, Xia Yuanluo, Xie Jiangang, Huang Xiangdong)....Pages 617-624 Fabrication of Silicon Nitride / Oxynitride by Reaction Bonding and Post Sintering (A. Bartek, T. Johansson, D. E. Niesz, T. Lindbäck, B. Q. Lei)....Pages 625-632 Optimization of the Silicon Nitridation Process (B. Q. Lei, D. Ashkin, T. Johansson, T. Lindbäck)....Pages 633-640 Gas Phase Production of Silicon Nitride Using a DC Plasma (P. D. Harmsworth, A. G. Jones, T. A. Egerton, S. R. Blackburn)....Pages 641-648 Pressureless Sintering in the Si-Y-Mg-O-N System (F. M. Mahoney, M. J. Hoffmann, G. Petzow, C. Boberski)....Pages 649-656 Some Features and Limitations of Zirconia Toughened Nitrogen Ceramics (Y. Cheng, C. O’Meara, S. Slasor, R. Pompe, D. P. Thompson)....Pages 657-664 Fabrication of Silicon Nitride Ceramics by Microwave Heating (T. N. Tiegs, J. O. Kiggans)....Pages 665-671 Preparation of Ln-α-Sialon Powders and Sintering Behavior (T. Yamada, T. Nakayasu, T. Takahashi, T. Yamao, Y. Kohtoku)....Pages 672-679 Mechanical Testing of Glass-Ceramic Matrix Composites (T. Grenier, G. Bessenay, M. Parlier, M. H. Ritty)....Pages 680-690 The Influence of Static Loads on the Oxidation Behaviour of Fibre Reinforced SiC/SiC Composites (Robert Lundberg, Torgny Stenholm, Lars Pejryd, Lars Kahlman)....Pages 691-698 Microstructure and Mechanical Properties of Hot Isostatically Pressed Whisker Reinforced Si3N4 Ceramics (L. K. L. Falk, H. Björklund, J. E. Adlerborn, H. T. Larker)....Pages 699-706 Sintering and Toughening of Silicon Nitride-Based Composites (S. Hampshire, Y-J. Song, D. O’Sullivan, V. Gunay)....Pages 707-714 Processing Routes and Microstructure of Ceramic-Matrix/Platelet Composites (Thomas Claassen, Nils Claussen)....Pages 715-725 Mullite and SiC Matrix SiC Fibre Composites for High Temperature Application (M. Parlier, T. Grenier, S. Renevey, B. Passilly, E. Mouchon, E. Bruneton et al.)....Pages 726-734 Measurement of Ktip in Fiber and Whisker Composites (W. R. Cannon, E. A. Mendoza)....Pages 735-742 Residual Stresses in Ceramic Fiber Composites: Effect of Non-Uniform Fiber Distribution (Bent Fruergaard Sørensen, Ramesh Talreja, Ole Toft Sørensen)....Pages 743-756 SiC Particulate Reinforced Y-TZP Composites (Xiaoxian Huang, Jingkun Guo, Linhua Gui, Baoshun Li)....Pages 757-764 Development of Silicon Nitride Based Matrices (Jesper Brandt, Kent Rundgren, Robert Pompe, Robert Lundberg, Lars Pejryd)....Pages 765-772 Influence of Processing on Thermal and Elastic Properties in Alumina Silicon Carbide Whisker Composites (+) (E. Scafè, L. Di Rese, L. Fabbri, G. Dinelli, G. Giusto, M. Tiengo)....Pages 773-780 Interface Design and a New Process to Produce SiC(w)/Si3N4 Ceramic Composite (Jianbao Li, Huirong Le, Yong Huang, Longlie Zheng, Jianguang Wu)....Pages 781-788 Toughening Ceramics by Laminating Composite Elements (W. J. Clegg, L. R. Seddon)....Pages 789-794 SiC Particle and Y-TZP Reinforced Mullite Matrix Composites (X. X. Huang, J. S. Hong, J. K. Guo)....Pages 795-803 Reinforcing Mechanism of SiC Whiskers in SiCw / Carbon Ceramic Composites (Jiemo Tian, Xiaohua Tong, Limin Dong, Zhenwen Wang, Lingling Wang)....Pages 804-812 Excimer Laser Machining of Silicon Nitride (Martin Wehner, Martin Burström)....Pages 813-820 The Strength and Fracture Behaviour of Engineering Ceramics — Influence of Machining and Residual Stresses (Thomas Hollstein, Wulf Pfeiffer)....Pages 821-829 Residual Stress in Si3N4 and SiC after Grinding and Cooling from High Temperature (M. Odén, T. Ericsson)....Pages 830-837 Grinding Advanced Ceramics with Crushable Diamond Wheels (M. Burström, J. M. Banard)....Pages 838-845 Effects of Testing Methods and Surface Grinding Conditions on Strength Values of Ceramics (Jan M. Lindemann, Arne Nissen)....Pages 846-855 Machining of Ceramic Components — Approaches to Higher Flexibility and Economy (W. König, C. Bönsch, E. Verlemann, A. Wagemann)....Pages 856-864 Some Aspects on Super-Finish Machining of Ceramic Components for Engines (Li Gang, Fu Youtong, Xu Yanshen, Peng Zemin)....Pages 865-871 Analysis of Ceramic Composites by 3D Microtomography (Thomas LÜthi, William A. Ellingson)....Pages 872-879 Nondestructive Testing of Ceramics by Computed Tomography and High-Frequency Ultrasonics (Holger Reiter, Michael Maisl, Udo Netzelmann, Walter Arnold)....Pages 880-887 Characterization of Defects in Ceramics by Computerized Tomography with High Spatial Resolution (B. Illerhaus, J. Goebbels, H. Heidt, W. Müller, Y. Onel, P. Reimers et al.)....Pages 888-896 Detection of Surface Defects in Ceramic Rolling Elements (S. A. Horton)....Pages 897-904 Material Selection and Quality for Ceramic Rolling Elements (R. T. Cundill)....Pages 905-912 Ultrasonic Inspection of Rocker-Arm Pad Inserts (D. Fargeot, C. Gault, E. Breton)....Pages 913-919 Analysis of Physical Properties of Ceramic Powders in an International Interlaboratory Comparison Program (S. G. Malghan, S. M. Hsu, A. L. Dragoo, H. Hausner, R. Pompe)....Pages 920-935 A Proposed Standard Practice for Fractographic Analysis of Monolithic Advanced Ceramics (Jeffrey J. Swab, Michael J. Slavin, George D. Quinn)....Pages 936-943 FEM-LIFTAP, A Finite Element Lifetime Analysis Postprocessor for Ceramic Components (K. Kussmaul, S. Lauf, K. Turan)....Pages 944-952 CM1 — A Simple Model for the Dynamic Deformation and Failure Properties of Brittle Materials (Ake Persson)....Pages 953-960 An OTD Mathematical Model for Process Optimization of Ce-TZP and Al2 TiO3 Ceramics (ShaoTang Zhao, SenFeng Chen, JianDong Ye, YiYuan Wu)....Pages 961-969 CMC Evaluation for Use in Military Aircraft Engines (G. Gauthier, G. Bessenay, Y. Honnorat)....Pages 970-984 Development and Reliability Evaluation of a Ceramic Stator Vane for Industrial Gas Turbines (Kimiaki Nakakado, Takashi Machida, Hiroshi Miyata, Tooru Hisamatu, Noriyuki Mori, Isao Yuri)....Pages 985-992 Joining Method with High Heat Resistance for Ceramic Rotors (Hiroaki Makino, Katsunori Yamada, Nobuo Kamiya, Shigetaka Wada)....Pages 993-1000 Ceramic Materials and Component Design for Aerospace Applications (W. Krüger, W. Bunk)....Pages 1001-1008 Development of Silicon Nitride Radial Turbine Rotors (Keiichiro Watanabe, Tadao Ozawa, Yoshito Kobayashi, Eito Matsuo)....Pages 1009-1016 Scientific Aspects of the Development and the Application of Ceramic Materials and Structural Components (A. G. Romashin)....Pages 1017-1024 Experimental Investigation of Ceramic Materials and Turbine Rotor Components Strength (Y. Nozhnitsky, L. Smirnov, S. Egorov, A. Markov, V. Sakovich)....Pages 1025-1034 Designing Gas Turbine Ceramic Elements (V. Navrotsky, Y. Nozhnitsky, Y. Shekhtman, N. Boutourlinova, Y. Fedina, E. Chyiaston)....Pages 1035-1041 Applications of Ceramics for the Rotary Engine (Nobuo Sakate, Tsutomu Shimizu, Akihide Takami)....Pages 1042-1049 Considerations in the Manufacture of Ceramic Valve Train Components and Wear (M. W. Langer, J. Strobel)....Pages 1050-1058 Using Ceramics for Mass Reduction in Valve Train (Herbert Gasthuber, Roland Krebser)....Pages 1059-1066 Research and Development on Ceramic Engines in China (Xiren Fu, Tungsheng Yen, Xiaohong Gao, Zongrong Wang)....Pages 1067-1074 Analysis and Testing of Ceramic Matrix Composites in Diesel Engines (Dieter Sygulla, Petar Agatonovic)....Pages 1075-1083 Ceramic Composite Applications in Diesel Engines — Experiences and Chances (Martin Leuchs)....Pages 1084-1092 Manufacturing of Ceramic Valve Discs and their Use in a Rotor CAM Engine (Jesper Brandt, Lars Kahlman, Robert Pompe, Karl-Erik Lindblad)....Pages 1093-1100 Si3N4 Composite Piston Cap for Adiabatic Engine (Jiemo Tian, Lingling Wang, Xiaohua Tong, Jianhua Zhou, Baoqing Zhang)....Pages 1101-1104 Fabrication and Testing of a Silicon Carbide Piston and Cylinder for Diesel Engine (D. L. Jiang, S. H. Tan, J. H. Wang, Y. L. Li, Y. J. Xu, D. Q. Cui)....Pages 1105-1112 Advanced Ceramic/Metal Composite Piston and Liner in LHR Engine (Xiaohong Gao, R. Lu, J. Wu, Y. Qian)....Pages 1113-1120 Low Heat Rejection Diesel Ceramic Coupon Tests (C. R. Brinkman, K. C. Liu, R. L. Graves, B. H. West, G. M. Begun)....Pages 1121-1130 Effects of Sodium Sulfate Induced Corrosion on the Static Fatigue Life of Silicon Nitride Containing Different Dopants (Jeffrey J. Swab, Gary L. Leatherman)....Pages 1131-1138 Effect of Microstructural Degradation on the Strength of Sintered Silicon Nitride after High Temperature Exposure (Nobuhiko Nishimura, Eito Masuo, Katsuhiko Takita, Yoshito Kobayashi)....Pages 1139-1145 Fabrication and Testing of Corrosion Resistant Coatings (D. P. Stinton, J. C. Mclaughlin, L. Riester)....Pages 1146-1153 Characteristics of Porous Cordierite Traps Intentionally Contaminated with Calcium and Zinc (L. Agostini, G. de Portu, S. Guicciardi, C. Borello, P. P. Demaestri, A. Giachello)....Pages 1154-1161 The Corrosion Behaviour of HIP Si3N4 and SiC/SiC Composite in Simulated Combustion Environments (J. Chen, J. Sjöberg, C. O’Meara, L. Pejryd)....Pages 1162-1169 Improved Thermal Stability of Y2O3 or Fe2O3 Doped Aluminium Titanate (P. P. Demaestri, A. Giachello)....Pages 1170-1178 Sodium Vanadate-SO3 Equilibria in the Hot Corrosion of Zirconia Thermal Barrier Coatings (R. L. Jones)....Pages 1179-1186 Oxidation Studies of Si2N2O (J. Persson, P.-O. Käll, M. Nygren, R. Larker)....Pages 1187-1194 Hot Corrosion of Alumina Matrix-Composites (Jeffrey J. Swab, Gary L. Leatherman, Mary H. Adair)....Pages 1195-1202 Boundary Lubrication of Ceramic Materials by Soft Metallic Coatings and Synthetic Oil (O. O. Ajayi, A. Erdemir, J.-H. Hsieh, R. A. Erck, F. A. Nichols)....Pages 1203-1210 Tribopolymerization as a Novel Approach to Ceramic Lubrication (Michael J. Furey, Czeslaw Kajdas)....Pages 1211-1218 Ceramic-Ceramic Composite Materials with Improved Friction and Wear Properties (M. Woydt, A. Skopp, R. Wäsche)....Pages 1219-1239 Pin-on-Disc Tests with Ceramics in Air and Aqueous Media (Peter Andersson)....Pages 1240-1247 Ceramic Coatings in Internal Combustion Engines (B. Ineichen, C. Klukowski)....Pages 1248-1259 Tribological and Thermal Ceramic Coatings for Advanced Adiabatic Engine (Roy Kamo, Walter Bryzik)....Pages 1260-1275 The Influence of Mechanical Characteristics of Ceramic Materials on the Regularity of Friction and Wear of Ceramic/Steel Couples under Friction with Lubricant (Ju N. Drozdov, A. G. Khurshudov, V. E. Mandrusov, D. H. Valeev)....Pages 1276-1281 Back Matter ....Pages 1283-1293
دانلود کتاب Proceedings of the 4th International Symposium on Ceramic Materials and Components for Engines : held at Göteborg, Sweden, 10-12 June 1991