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Beta-type CVD-Si3 N4 plates (up to 1.1 mm thick) have been prepared by adding TiCl4 vapor to the system SiCl4 -NH3 -H2 at deposition temperatures of 1350° to 1450°C, while α-type or amorphous CVD-Si3 N4 was obtained without TiCl4 vapor at the same deposition temperature. Three to four wt % 777V was included in the β-type CVD-Si3 N4 matrix. The density, preferred orientation, and lattice parameters of β-type CVD-Si3 N4 were examined. 相似文献
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MICHIO INAGAKI KAZUHIRO URASHIMA SHINSUKE TOYOMASU YASUO GOTO MOTOTSUGU SAKAI 《Journal of the American Ceramic Society》1985,68(12):704-706
The work of fracture, γwoF, of a soda-lime-silica glass was determined as 5.5 J/m2 in an inert atmosphere and 4.4 J/m2 in air by using a short bar specimen with a chevron notch. The critical stress intensity factor KIC calculated from γwof obtained in an inert atmosphere agreed with the value, 0.88 MN/m3/2 , determined by the indentation method. In unloading-loading cycles during stable crack growth, crack healing was observed both on the diagram of load vs load-point displacement and visually. Crack healing is more prevalent in an inert atmosphere, occurring only minimally in air. The energy for healing was measured as 0.65 J/m2 in an inert atmosphere and ∼0.21 J/m2 in air. 相似文献
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