论文部分内容阅读
针对提高化铝用铸铁坩锅抗融蚀寿命的实际问题，选用价格较低、耐高温、抗融蚀性好的 Ａｌ２Ｏ３陶瓷材料作为坩锅内壁的工作层，采用等离子喷涂技术来提高其抗融蚀性。但由于Ａｌ２Ｏ３陶瓷涂层的致密性差、结合强度及抗热震寿命低等缺点，不适宜化铝坩埚在７２０℃长时间加温，且液铝呈搅拌行为的工作条件下使用。本文在Ａｌ２Ｏ３喷涂粉末中加入１３％ ＴｉＯ２，促使涂层的组织结构发生变化，提高了涂层的结合强度，改善了涂层的致密性，同时有效地提高了涂层的抗铝融蚀性能，大大地延长了坩埚的使用寿命。
Aiming at the practical problems of improving the anticorrosive life of cast aluminum crucibles for aluminum casting, Al2O3 ceramic materials with lower price, high temperature resistance and good ablation resistance are selected as the working layer of the crucible inner wall, and the plasma spraying technique is adopted to improve its anti- Erosive. However, due to the poor compactness of the Al2O3 ceramic coating, the shortcoming of the bond strength and the low heat shock life, the unsuitable aluminum crucible is heated at 720 ° C. for a long time and the liquid aluminum is used under the working conditions of the stirring. In this paper, 13% TiO2 was added into Al2O3 spray powder to promote the change of the microstructure of the coating, the bonding strength of the coating was improved, the compactness of the coating was improved, the corrosion resistance of the coating to aluminum was effectively improved, Greatly extend the life of the crucible.