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    • 7. 发明授权
    • Process for shaping ceramic composites
    • 陶瓷复合材料成型工艺
    • US5244621A
    • 1993-09-14
    • US865683
    • 1992-04-08
    • Fumihiro WakaiYasuharu KodamaKansei IzakiTakamasa Kawakami
    • Fumihiro WakaiYasuharu KodamaKansei IzakiTakamasa Kawakami
    • C04B35/593C04B35/645C04B41/00C04B41/80
    • C04B35/5935C04B35/645C04B41/0072C04B41/80
    • There are disclosed in process for shaping ceramic composites which comprises shaping a sintered silicon nitride-silicon carbide composite material having a microstructure formed predominantly of equiaxed grains with an average grain size of 2 .mu.m or below and a silicon carbide content of 10-50% by volume, obtained by liquid-phase sintering, at least 40% by volume of the silicon nitride in the material being in the .beta.-phase, by superplastically deforming said material at a strain rate of 10.sup.-6 sec.sup.-1 to 10.sup.-1 sec.sup.-1 under application of tensile stress or compressive stress in a superplastic temperature region of 1400.degree.-1700.degree. C., and a process for shaping ceramic composites which comprises shaping said sintered composite material by superplastic deformation as described above and then heat-treating the shaped article obtained in a non-oxidizing atmosphere under normal or applied pressure at 1000.degree.-2300.degree. C.
    • 在制造陶瓷复合材料的方法中公开了包括使具有主要由等轴晶粒组成的微结构的氮化硅 - 碳化硅复合材料成型,其平均晶粒尺寸为2μm或更小,碳化硅含量为10-50% 通过液相烧结获得的材料中,至少40体积%的材料中的氮化硅在β相中,通过使所述材料以10-6sec-1至10-1sec -1的应变速率进行超塑性变形, 1在1400°-1700℃的超塑性温度区域中施加拉伸应力或压应力,以及一种用于成形陶瓷复合材料的方法,其包括如上所述通过超塑性变形使所述烧结复合材料成形,然后热处理成形 在正常或施加压力下在1000-2200℃下在非氧化性气氛中得到的制品。