摘要
介绍了两种模拟试验。在流动性试验中，使金属液取代泡沫材料，金属在短时间暴露后从铸型中排出。热分析和热失重试验表明，涂料的透气性和金属温度对液态聚苯乙烯的输送速度有很大的影响，聚合物残余很快从金属一泡沫材料界面排除。在第二次试验中，用加热的钢块模拟熔融金属，同时研究了加热温度和加热时间对泡沫材料分解、耐火涂料润湿和过滤的影响。此外发现，分解的聚苯乙烯可通过高透气性涂料快速输送，以及一种不规则的金属一泡沫材料界面，这有助于说明空气等气体在浇注过程中是怎样通过涂料逸出的。
Two types of simulation teat were introduced. In the fluidity testing the liquid metal is replaced by a foam, and is excluded from casting mold after being short-time exposed. From heat analysis and weight-loss test it was seen that the permeability of coating and the metal temperature had considerably effect on delivery rate of the liquid polystyrene, and that the residual polymer was rapidly excluded from the metal-foam interface. In second testing, the simulation test was done by replacing the molten metal by a heated steel block, and the effects of the temperature and duration of heating on decomposition of the foam and on wettability and filterability of refractory coating were investigated. In addition, it was discovered that the decomposed polystyrene may be rapidly delivered through the coating with good permeability, and that there is an irregular metal-foam interface, which will help explain how gases such as air escape from coating during pouring.
作者
徐庆柏
XU Qingbai(Hefei University of Technology, Hefei 230009, Anhui Chin)
出处
《铸造工程》
2017年第5期5-10,共6页
Foundry Engineering
关键词
消失模铸造
泡沫
金属
涂料
investment casting
foam
metal
coating
