氧化物结合碳化硅复合材料的研究

Study of Silicon Carbide Material Bonded with Oxide

通过对氧化物结合碳化硅复合材料中添加的氧化物种类和数量 ,以及烧结温度、试样尺寸的分析发现 :氧化钙的加入有利于试样抗弯强度的提高 ;氧化硅的质量分数为 0 5 %时试样抗弯强度最高 ,达 4 2 0 3MPa ;最高烧结温度为 15 30℃时试样无晶粒长大现象 ,抗弯强度较高 ;试样的强度有明显的尺寸效应 ,尺寸越大 ,即试样的有效体积越大 ,则试样的断裂概率越大 。

Studied are the effects of type and amount of the oxide additions, the sintering temperature, and the sample size on the properties of silicon carbide material. The experimental results show that calcium oxide is of benefit to improving bending strength, and the maximal value 42 03 MPa could be obtained when silicon dioxide is 0 5%.When sintering temperature reaches to 1 530 degrees C,the grains stop growing and a high bending strength is obtained;the bending strength and fracture probability vary with sample size.With sample size increasing, the fracture probability increases,thus causes a decreasing of bending strength.