支柱瓷绝缘子的组织结构及其可靠性

Microstructure and Reliability of Ceramic Stanchion Insulators

本文研究了包括铝质瓷及硅质瓷质的4种支柱瓷绝缘子的成分、物相、组织结构及性能,采用抗热冲击试验及断裂韧性(KIC)测试,评价瓷绝缘子的可靠性。结果表明:Al2O3、Si O2含量及氧化铝、残余石英颗粒与基体的界面结合状态,气孔的形态与分布等对瓷绝缘子的强度、KIC等力学性能起着至关重要的作用。除力学性能外,铝质瓷绝缘子的抗热冲击性能主要受其热膨胀系数及弹性模量影响;而硅质瓷绝缘子的抗热冲击性能则主要受其热导率影响。

Compositions,microstructures and mechanical properties of four alumina and silica based stanchion porcelain insulators were investigated. Reliability of these stanchion porcelain insulators was also evaluated in terms of thermal-shocking and fracture toughness（ KIC） tests. The results show that Al2O3 and Si O2 contents, interfacial bonding between alumina or residual silica particles and the substrate,morphologies and distributions of pores in the ceramic insulators and etc have great effects on mechanical properties of the ceramic insulators,such as bending strength and KIC. Except the mechanical properties,thermal-shocking resistance of the alumina porcelain insulators depends on their coefficient of thermal expansion and elasticity modulus,while that of the silica porcelain insulators is mainly affected by their thermal conductivity.