单晶相β-SiC改性大电机防晕材料研究

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

本文研究了 β- Si C微粉及 β- Si C-环氧脂漆复合防晕涂层的非线性导电性。表明小粒径 β- Si C非线性好 ,粒径越小电阻越低非线性系数越大 ,粒径在 14～ 2 1μm之间时非线性最好。与粒径相近的α- Si C相比 ,β- Si C的非线性系数大、电阻率低。β- Si C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- Si C含量提高而增大 ,防晕电压升高。β- Si C调节α- Si C防晕涂层的电阻率和非线性可有效地提高材料的非线性 。

Non linear electrical conductivity property of β SiC and β SiC epoxy ester lacquer composite coating layer was investigated. Smaller particle size β SiC has lower resistance and greater non linear coefficient. β SiC has the most excellent non linearity when particle size varies from 14~21μm. Non linearity of composite coating layer becomes greater by increasing β SiC powder particle size or synthesis temperature. With same particle size, non linear coefficient and corona voltage are rising with β SiC content increased. Good effect has been 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 improve anti corona property greatly.