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为了制取掺杂均匀的高性能稀土氧化物钼合金,采用液-液掺杂新工艺将稀土硝酸盐溶液加入到多钼酸铵溶液中,并向溶液中加入柠檬酸作为络合剂,加入硝酸调节溶液的pH值,当柠檬酸根离子将稀土离子和带正电的钼酸根离子完全络合后,即可采用溶胶-凝胶技术制备出干凝胶。当初始溶液的pH=1～1.5且柠檬酸的添加量为仲钼酸铵质量的1.19倍时可以制备出成胶效果最好的干凝胶。继而将干凝胶在560℃下直接烧结,制得的均匀掺杂稀土氧化物的MoO3混合粉体,可直接用于高性能稀土氧化物钼合金的制备。
In order to obtain high-performance rare-earth doped molybdenum alloy doped with rare earth nitrate solution was added to the solution of ammonium polymolybdate solution, and citric acid was added to the solution as a complexing agent, adding Nitric acid adjusts the pH of the solution. When the citrate ions completely complex the rare earth ions with the positively charged molybdate ions, the sol-gel technique can be used to prepare xerogels. When the initial pH of the solution = 1 ~ 1.5 and citric acid was 1.19 times the mass of ammonium paramolybdate can be prepared when the best gelling gel. Then the xerogel is directly sintered at 560 ° C to obtain the uniformly mixed MoO3 mixed powder doped with the rare earth oxide, which can be directly used for preparing the high-performance rare earth oxide molybdenum alloy.