论文部分内容阅读
精密合金广泛采用真空热处理。一般精密合金的真空热处理,真空度只要达到10~(-4)乇,(0.133Pa)即能获得良好的光亮度。而含Ti、Al元素的精密合金,在高温时与O_2的亲和力很强,所生成的氧化物稳定性甚高,因而随着含Ti、Al合金化学活性的增加、真空度必须达10~(-5)乇。但应指出,含Ti、Al的合金在高真空的情况下仍难以有理想的光亮度,这是操作人员经常遇到的难题。究其原因,不外乎是因为真空设备受污染,微漏,放气等综合因素的影响。例如磁性材料Fe-Ni-Nb-Mo-Ti(Al)的真空热处理,其工作真空度5×10~(-5)乇,温度1150℃。虽然真空度高但处理结果在试样表面仍呈现一层灰色致密的膜。针对这种情况,我们改进了装炉方式,即将试样叠片,片间用一层极细的氧化铝粉隔开,外面用与试样同类的材料(厚0.05mm)制成的屏蔽盒,将试样放在里面,这样处理后,在同样工艺条件下,试样外观光亮、晶粒显现。
Precision alloys widely used in vacuum heat treatment. General precision alloy vacuum heat treatment, as long as the degree of vacuum reaches 10 ~ (-4) Torr, (0.133Pa) that can get good brightness. However, the precision alloys containing Ti and Al are very strong in affinity with O 2 at high temperature and have very high oxide stability. Therefore, as the chemical activity of the alloy containing Ti and Al increases, the degree of vacuum must reach 10 to -5) Torr. However, it should be pointed out that alloys containing Ti and Al are still difficult to achieve their desired brightness under high vacuum conditions, which are often encountered by operators. The reason, nothing more than because of vacuum equipment contaminated, micro-leakage, deflation and other comprehensive factors. For example, the magnetic material Fe-Ni-Nb-Mo-Ti (Al) vacuum heat treatment, the working vacuum 5 × 10 ~ (-5) Torr, temperature 1150 ℃. Although the degree of vacuum is high, the treatment result still shows a gray and dense film on the sample surface. In response to this situation, we have improved furnace loading method, the sample will be laminated, with a thin layer of aluminum powder separated by a layer of the same sample with the same material (thickness 0.05mm) made of shielding box , The sample on the inside, so that after treatment, the same process conditions, the appearance of bright samples, the grain appears.