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By Shigeyuki Somiya (Eds.)

ISBN-10: 0126546304

ISBN-13: 9780126546309

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Mori, Masaki, Komeya, Katsutoshi, Tsuge, Akihiko; and Inoue, Hiroshi. (1982). Chikka keisο funmatsu [Silicon nitride powder], Ceramics Japan, 17, 834-840. Nishida, Katsutoshi, et al. (1973). Chikka keiso kaatsu shöketsutai no kyodo [Strength of hot-pressed silicon nitride]. In Shöwa 48 nen funtai funmatsu yakin kyökai shunki taikai köen yoköshü [Proceedings of the Spring 1983, meeting of the Japan Society of Powder and Powder Metallurgy]. Kyoto: Funtai Funmatsu Yakin Kyokai, pp. 3 4 - 3 6 . Okabe, Yasuzö, H ö j ö , Jun'ichi, and Katö, Akio.

T h e r e has been much discus­ sion of the crystal structure of S i N , which has not yet been fully resolved, but it is thought that the a form is apt to contain oxygen as a solid solution within the crystal. Powders principally of the a form with a slight a m o u n t of the β form as well as those of the a m o r p h o u s phase are commercially available. All transform into ß - S i N after sintering. 3 4 3 4 3. 14. Effect of the alpha ratio in the powdered material on strength. From Nishida et al (1973).

10. Sketch of an SiC (Acheson) production furnace, a, graphite resistance core; b, decompositionformed graphite; c, a-SiC ingot; d, unreacted materials ß-SiC; e, unreacted materials. and distance apart in an electric resistance furnace (an Acheson furnace), with the electrodes connected by graphite powder. A n electric current is passed b e t w e e n the poles, heating the furnace and causing the reaction to advance. T h e reaction within the furnace is complex but, in general, following the formula Si0 2 + 3 C - > SiC + 2CO an ingot zone of α-SiC, passing through the /3-SiC stage, is formed in the h i g h - t e m p e r a t u r e zone around the graphite core.

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Advanced Technical Ceramics by Shigeyuki Somiya (Eds.)

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