邱羽
,
高濂
无机材料学报
研究了NH4Cl/KCl添加剂对铝粉氮化反应的影响.运用TG/DSC考察了Al粉、Al+NH4Cl和Al+NH4Cl/KCl等前驱体粉末的氮化过程.运用XRD、SEM、XRF对氮化产物进行了表征.研究结果表明:NH4Cl能降低氮化温度,避免铝粉发生熔化和结块,保证得到纳米尺度的AlN颗粒;KCl的蒸发则可以破坏铝粉表面的氮化膜,促进铝粉的完全氮化,且只有两种同时作为添加剂使用,才能实现铝粉的完全氮化.用氨气做为反应气体可以消除因添加剂引入水分杂质的影响.NH4Cl/KCl还是一种低残留的添加剂,可以用来制备高纯度的AIN.
关键词:
NH4Cl
,
KCl
,
aluminium
,
nitridation
Y.L.Zhu
,
S.N.Ma
,
C.H.Yang and R.F.Fu Surface Engineering Research Inst.
,
CMES
,
Beijing 100072
,
China
金属学报(英文版)
Cored wires for electric arc spraying of Al/Al 2 O 3 MMC coatings were developed, with Al 2 O 3 powder as the core material and commercial aluminium strip as the retaining sheath. The bond strength, Al 2 O 3 content, microstructure, micro-hardness and wear resistance of coatings produced by arc spraying of the cored wires were experimentally investigated and were compared with those of pure aluminum coating.
关键词:
Al 2 O 3
,
null
,
null
,
null
,
null
