海绵钛中残留氯化镁对钛及钛合金熔铸的影响

摘要

分析了海绵钛残留氯化镁对钛及钛合金熔铸的影响。在钛及钛合金铸锭生产过程中，由于氯化镁吸湿现象导致压制的电极块出现白色析出物、一次锭表面有潮湿的黑斑以及真空系统内沉积物水化等现象。残留氯化镁对真空熔炼及设备的危害主要有：①增大发气量，降低熔炼真空度；②使铸锭气体杂质含量偏高，气孔增加；③使铸锭中残留的高熔点颗粒增加；④腐蚀真空系统，降低设备寿命。最后对出现的问题，提出了相应的预防措施。%The influence of residual magnesium chloride in sponge titanium on casting of titanium and its alloys has been studied .The results show that during the casting process , white precipitates were found on the electrode surface , while humid black spots appeared on the primary ingot and precipitates inside vacuum system hydrated , due to the moisture absorption of magnesium chloride .Damages to the vacuum system and equipments were mainly as follows:①increased gas generation to lower vacuum of the system;②more gas impurities in ingots , then higher porosity;③in-creasing retained particles with high melting point; and ④ vacuum system corrosion to decrease life span of equipments .And measures were raised to prevent occurred problems .