【摘要】 综述了碳化硅非线性导电特性的意义和碳化硅材料的特性、非线性导电特性的测试及计算方法,讨论了α-SiC和β-SiC的非线性导电特性及其影响因素。前人研究结果表明,对于α-SiC,颗粒越粗,电阻率ρ0越低、非线性系数β越大;颗粒越细,电阻率ρ0越高、非线性系数β越小;不同种类,不同工厂生产的碳化硅的电阻率ρ0和非线性系数β是不同的;α-SiC制成防晕带后电阻率升高,β值下降,颗粒越粗,β值下降越大;防晕带与粉料的非线性性质有相似的规律,而β-SiC具有比α-SiC低得多的电阻率和较大的非线性系数,并且其电阻率和非线性系数受到粉料的粒径、合成温度和涂层有机物含量等因素的直接影响。更多还原

【Abstract】 The purpose of studying silicon carbide non-linear property is described,the material property of silicon carbide,the measurement and calculation methods are summarized,the properties and the influencing factors ofα-SiC andβ-SiC are discussed.Forα-SiC,the resistivityρ 0 is decreased and the non-linear coefficientβis increased with the increasing of SiC powder size,whereas the resistivityρ 0 is increased and the non-linear coefficientβis decreased with the decreasing of SiC powder size.The resistivityρ 0 and non-linear coefficientβof silicon carbide differs from varieties and manufacture.The resistivityρ 0 ofβ-SiC is much lower than the resistivity ofα-SiC and the non-linear coefficientβofβ-SiC is higher thanα-SiC.The resitivityρ 0 and non-linear coefficientβofβ-SiC are also affected by SiC powder size and synthesis temperature.更多还原