Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Stretching or stretch forming
Patent
1992-04-08
1993-09-14
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Stretching or stretch forming
264 65, 264 66, 264325, 264332, 264 60, C04B 3556, C04B 3558
Patent
active
052446212
ABSTRACT:
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.
REFERENCES:
patent: 3895219 (1975-07-01), Richerson et al.
patent: 4184882 (1980-01-01), Lange
patent: 4572902 (1986-02-01), Matano et al.
patent: 4594330 (1986-06-01), Suzuki et al.
patent: 4732719 (1988-03-01), Panda et al.
patent: 4752427 (1988-06-01), Wakai et al.
patent: 4784818 (1988-11-01), Wakai et al.
patent: 4800182 (1989-01-01), Izaki et al.
Wakai et al, A Superplastic Covalent Crystal Composite In Nature, vol. 344, 9 Mar. 1990, pp. 421-423.
Wakai et al, "Superplasticity, of Ceramics, Ceramics International" vol. 17, 153-163 (1991).
Tottle C. R., An Encyclodpardia of Metallurgy and Materials, the Metals Society, 1984, MacDonald & Evans, p. 110.
Karunaratne, Grain-Boundary de-Segregation and Intergranular Cohesion in Si-Al-D-N Ceramics, Journal of Mat. and Sci (1980) No. 7810 & 784
Izaki Kansei
Kawakami Takamasa
Kodama Yasuharu
Wakai Fumihiro
Derrington James
Director-General of the Agency of Industrial Science and Technol
Mitsubishi Gas Chemical Company Inc.
LandOfFree
Process for shaping ceramic composites does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for shaping ceramic composites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for shaping ceramic composites will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2024541