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Development of Metal Matrix Composite for Cylinder Block
Technical Paper
2000-05-0070
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English
Abstract
A new Metal Matrix Composite (hereafter MMC) material for cylinder block bores has been developed, which makes it possible to reduce engine weight and size. To decide type, size and volume fractions of the MMC reinforcements, wear and scuffing characteristics as well as tensile strength were evaluated. Based on wear test results, crystallized alumina-silica fiber and mullite particles were selected as MMC reinforcements. In the case of counter-part (piston ring material) wear, the smaller particle size, the lesser ring material wear. For scuffing characteristics, the smaller particle size and the higher volume fraction, the higher the scuffing resistance. However, it is necessary to limit the volume fraction of reinforcements and particle size, because too high volume fraction and too small particle size causes a degradation in the tensile strength of the MMC. This is caused by an increase in micro porosity of MMC. Therefore, MMC reinforced crystallized alumina-silica fiber (Vf5%) and 12 mullite particle (Vf10%) are selected as optimal material, because this MMC material supported the desired wear characteristic and tensile strength. Electrochemical machining (ECM) was adopted to ensure the scuffing resistance. Relationships between scuffing characteristics and ECM-processed bore surface characteristics were clarified. This MMC cylinder block was commercialized in August 1999.
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Authors
- Manabu Fujine - 1) Toyota Motor Corporation,1,Toyota-cho,Toyota,Aichi,471-8572,Japan 2) Toyota Central R&D Labs.,Inc.,Nagakute,Aichi,480-1192,Japan
- Shinji Kato - 1) Toyota Motor Corporation,1,Toyota-cho,Toyota,Aichi,471-8572,Japan 2) Toyota Central R&D Labs.,Inc.,Nagakute,Aichi,480-1192,Japan
- Toshihiro Takami - 1) Toyota Motor Corporation,1,Toyota-cho,Toyota,Aichi,471-8572,Japan 2) Toyota Central R&D Labs.,Inc.,Nagakute,Aichi,480-1192,Japan
- Shigeru Hotta - 1) Toyota Motor Corporation,1,Toyota-cho,Toyota,Aichi,471-8572,Japan 2) Toyota Central R&D Labs.,Inc.,Nagakute,Aichi,480-1192,Japan
Topic
Citation
Fujine, M., Kato, S., Takami, T., and Hotta, S., "Development of Metal Matrix Composite for Cylinder Block," SAE Technical Paper 2000-05-0070, 2000.Also In
References
- Funatani 1995 Weight Reduction of Engine and Surface Treatment of Aluminum Alloy Metals&Technology 65 4 295 305
- Ohgami E. 1991 Nissan's New V8 and L4 Aluminum Cylinder Block SAE Paper 910431
- Murakami 1995 Diesel Engine Sulfuric Acid Corrosion Wear Analysis Automotive Engineering Society Theses 26 4 45 50
- Bin F. Cole G.S. 1992 Scuffing Resistance of Selected Materials as protection for Bores in Aluminum Engine Blocks SAE Paper 920285