单晶相β-SiC改性大电机防晕材料研究

本文研究了β－SiC－环氧脂漆复合防晕涂层的非线性导电性。表明小粒径β－SiC非线性好，粒径越小阻越低非线性系数越大，粒径在14－21μm之间时非线性最好。与粒径相近的α－SiC相比，β－SiC防晕涂层的非线性系数随粒径增大或合成温度提高而变大；同粒度条件下则随β－SiC含量提高而增大，防晕电压升高。β－SiC调节α－SiC防晕涂层的电阻率和非线性可有效地提高材料的非线性，改善防晕效果。

Study on modified anti-corona material with single crystal β-SiC for large electric machine

Non-linear electrical conductivity property of β-SiC and β-SiC-ep oxy ester lacquer composite coating layer was investigated. Smaller particle size β - SiC has lower resistance and greater non-linear coefficient. β-SiC has the mo st excellent non-linearity when particle size varies from 14～21μm. Non-linearit y of composite coating layer becomes greater by increasing β-SiC powder particle size or synthesis temperature. With same particle size, non-linear coefficient a nd corona voltage are rising with β-SiC content increased. Good effect has bee n obtained as β-SiC is used to regulate the non-linear electrical conductivity of α-SiC anti-corona material, showing that it can increase non-linearity and i mprove anti-corona property greatly.