In this paper , the multifactors - electrical , thermal , cool and thermal circulation of accelerating ageing experiment based on the stator bar of 220mw turbine generator has been conducted in the laboratory . the results of the experiment show that there has not fixed rule between maximum pd quantity and insulation , but the increasing of maximum pd grads increase along with ageing time of insulation 本论文通过对220mw的汽轮发电机真机线棒进行电、热、冷热循环等多因子老化试验，发现局部放电的最大放电量与绝缘老化时间之间没有固定的规律可寻，而最大放电量的梯度随绝缘老化时间的增大而增大。
A reliability experiment of thermal aging was carried out for the two types of joints , scanning electron microscopy , energy dispersive x - ray spectrometer and micro x - ray diffractomer were adopted to investigate the interfacial evolution behavior of joints , and kinetics model of imc formation was established . the results show that imc growth follows the parabolic law as a function of aging time at certain aging temperature , imc growth is more sensitive to the aging temperature than the aging time , the activation energy of cu - al imc growth is 97 . 1kj / mol and the major forming cu - al imc are cual2 and cu9al4 , the activation energy of au - al imc growth is 40 . 1kj / mol and the main au - al imc are au4al and au5al2 , with au2al and aual at the interfacial periphery of joints , the rate of cu - al imc growth is about 1000 times slower than that of au - al imc , and kirkendall voids and cracks are easily appeared during thermal aging in gold ball bonds while voids and cracks are absent in copper ball bonds even after aging at 200 for 2900 hours and 250 for 169 hours 研究结果表明:金属间化合物厚度与老化时间的关系符合抛物线法则,金属间化合物的生长对老化温度比老化时间更加敏感; cu - al金属间化合物生长的激活能为97 . 1kj / mol ,老化后金属间化合物呈层状分布,主要相为cual2和cu9al4 ; au - al金属间化合物生长的激活能为40 . 1kj / mol ,主要相为au4al和au5al2 ,同时在界面周边区域生成了au2al和aual ;老化过程中cu - al金属间化合物生长速率比au - al金属间化合物生长速率小103数量级;金丝球键合点200老化96小时出现了明显的kirkendall空洞和裂纹,但铜丝球键合点200老化2900小时和250老化169小时都没有形成空洞和裂纹。
