球形烧结态Cr_3C_2-25%NiCr复合粉末制备研究

Research on preparation of spheroidal sintered Cr_3C_2-25%NiCr composite powder

试验通过添加高分子分散剂配制Cr3C2–25%NiCr料浆,采用喷雾干燥技术制备球形粉末,在保护气氛下进行液相烧结,气流粉碎分级后形成合适粒度粉末。实验研究了不同分散剂含量对喷雾干燥制备Cr3C2–25%NiCr复合粉末性能的影响,液相烧结工艺对Cr3C2与NiCr合金相之间冶金化结合状态的影响。研究结果表明:高分子分散剂能够很好的调解料浆性能,使喷雾干燥粉末具有良好的物性。采用SEM、XRD及化学成分分析表明粉末物理性能与国外粉末相当,超音速火焰喷涂涂层性能较好。

A type of high polymer disperser was added in slurry for preparing Cr3C2-25%NiCr spheroidal powder by spray dried,which was liquid sintered under protective gas,and finally the suitable grain powder was obtained through comminution by gas stream. The effect of different content of disperser in the slurry to spray dried powder properties and liquid sinter process to metallurgical bonding of Cr3C2 and NiCr alloy was studied in this paper. The result indicates that the better physical properties of spray dried powder is obtained through high polymer disperser conciliated slurry. SEM and X-ray diffraction are used to analyze chemical component and physical properties of powder. Properties of nickel chrome chromium carbide powders are similar to the international powders ,HVOF sprayed coating has excellent mechanical properties.