Influence of Binder Phase Content on the Microstructure and Properties of HVOF Sprayed TiB_2-Ni Coatings
Influence of Binder Phase Content on the Microstructure and Properties of HVOF Sprayed TiB_2-Ni Coatings
复制标题
粘结相含量对HVOF喷涂TiB_2-Ni涂层组织与性能的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Yu Wang
中科院分区：
文献类型：
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作者：
Xiao Chen;Hongtao Wang;G. Ji;X. Bai;Yu Wang
采用机械合金化方法制备了TiB 2 - 40 Ni和TiB 2 - 50 Ni粉末，采用超音速火焰喷涂技术制备了TiB 2-Ni涂层，利用扫描电镜（SEM）和X射线衍射仪（XRD）分析了涂层的显微组织和相结构，采用压痕法测量了涂层的显微硬度。研究了两种涂层的抗热震性和耐熔融Al-12.07%Si合金腐蚀性能，结果表明：两种涂层均致密，孔隙率分别为1.25%和0.12%，两种涂层的相组成均为TiB 2和Ni，两种涂层的硬度均为（643.5±56.8）HV0.3和（597.9±36.1）HV 0.3，特别是TiB 2 - 50 Ni涂层具有优异的抗热震性能，两种涂层在Al-12.07%的熔体中具有良好的耐久性经120 ℃浸泡试验后，TiB 2 - 50 Ni涂层具有较好的耐蚀性能。
TiB2-40Ni and TiB2-50Ni powder fabricated by mechanical alloying were sprayed by high velocity oxygen fuel(HVOF)to obtain TiB2-Ni coating.The microstructure and phase structure were analyzed by scanning electron microscope(SEM)and X-ray diffraction(XRD).The microhardness was measured by indentation method,the properties of thermal shock resistance and corrosion resistance to molten Al-12.07%Si alloy were investigated.The results show that both of coatings are compact,and their porosities are 1.25% and 0.12%respectively,the phase constitution of two coatings are TiB2and Ni,the hardness of two coatings are(643.5±56.8)HV0.3and(597.9±36.1)HV0.3respectively.The coatings,especially TiB2-50Ni coating have excellent performance of thermal shock resistance.And two coatings have good durability in the molten Al-12.07%Si after 120himmersion test,TiB2-50Ni coating has better performance of corrosion resistance.