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《Cemented Carbide》 2009-03
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Effects of BaF_2/CaF_2 Addition on the Cr_3C_2 Matrix Cermet Coating Prepared by Detonation Gun Spraying

Zhang Youcha1 He Limin2 Jia Chengchang1 Li Weiguang2(1.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,2.Beijing Institute of Aeronautical Materials,Beijing 100095)  
The Cr3C2 matrix cermet coatings with BaF2/CaF2 eutectic addition were made by detonation gun spraying.The morphology of the milled powder,microstructure,micro -hardness and porosity of the coatings are studied by XRD,SEM and microhardness tester to learn the effect of incorporation method and the content of BaF2/CaF2 eutectic on the Cr3C2 matrix cermet coating.The results show that the mixed Cr3C2 matrix cermet powder with 10% BaF2/CaF2 milled for 1h in high energy mill has the minimal and the most homogeneous particle size.The microhardness(HV) of the sprayed coatings decreases due to addition of eutectic.The micro-hardness and porosity decrease with increasing of eutectic amount.The pre-milling of eutectic and NiCr alloy powder helps to improve the density,uniformity and HV of the sprayed coatings.The porosity is 0.2% and the HV is 665.6.
【CateGory Index】: TG174.4
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