| Budget Amount *help |
¥24,310,000 (Direct Cost: ¥18,700,000、Indirect Cost: ¥5,610,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
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| Outline of Final Research Achievements |
This study aimed to synthesize highly dense diamond composites by designing functionally graded interface and surface structures on the diamond via chemical vapor deposition (CVD) of ceramic layers and to examine the sintering behavior. We have developed the coating process of SiC layers on the surface diamond powders with various particle sizes. The diamond powders with SiC coating layers were consolidated with SiO2 powders to dense compacts by spark plasma sintering at temperatures of 1873-1923 K, forming well adhesive heterophase interfaces of SiO2/SiC/diamond with no crack and pores. The dense structure was attributed to the rapid viscous flow of SiO2 and functionally graded structue with excellent compatibilty and wettarabilty between the multiphases. Besides, we have successfully achieved the laminated coating of SiC and SiO2 multi-layers on diamond particles by CVD to form functionally graded structure on the diamond particle surfaces, prior to the sintering process.
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