机械合金化制备Ni-B-Si合金粉末

本实验选取成分为92%Ni-4%B-4%Si的混合粉末进行机械合金化,并每隔一定时间定量取粉进行SEM、XRD及DSC分析。实验结果表明,当球磨至30 h时,粉末形貌趋于球状,微量元素B和Si已经完全向镍中固溶,此时起始熔化温度降至1038℃;继续延长球磨时间粉末发生团聚,并在球磨至80 h时,趋于非晶化转变;将球磨40 h的合金粉末与松装镍粉在1100℃进行熔渗烧结时,发现其与镍粉发生冶金结合并形成致密的烧结体。

Mechanical Alloying Preparation of Ni-B-Si Alloy Powers

The 92%Ni-4%B-4%Si alloy powers were prepared by mechanical alloying of nickel carbonyl, boron and silicon powders. The morphology, average particle size, phase composition and initial melting temperature were investigated by laser particle size analyzer, SEM, XRD and DSC. The results show that when the ball milling time is 30 h, the morphology of the 92%Ni-4%B-4%Si alloy powders becomes spherical, the alloying elements B and Si completely dissolve into the Ni matrix, and the initial melting temperature decreases to 1038 °C. When the ball milling time is up to 80 h, the lattice structure collapses and the amorphous transformation tends to occur. The infiltration of 92%Ni-4%B-4%Si alloy powders after 40 h ball milling and the loosely packing nickel powders at 1100 °C lead to the high density sintered alloy through metallurgical bonding