A certain amount of Ti was added to the plasma cladding Fe-Cr-C coating in the early stage in order to improve the quality and properties of the coating.Ti-Fe-Cr-C composite powder was prepared by precursor carbonizat...A certain amount of Ti was added to the plasma cladding Fe-Cr-C coating in the early stage in order to improve the quality and properties of the coating.Ti-Fe-Cr-C composite powder was prepared by precursor carbonization-composition process.In situ synthesized TiC-Fe-Cr coatings were fabricated on substrate of Q235 steel by plasma cladding process with the composite powder.Microstructures of the coatings with different process parameters,including cladding current,cladding speed,number of overlapping cladding layers,were analyzed by scanning electron microscope.The results show that the structure of the TiC-Fe-Cr coating is greatly affected by the cladding current,the cladding speed and the overlapping cladding process.In this test,when the cladding current of 300 A and the cladding process parameter of the cladding speed of 50 mm/min are clad with three layers,a well-formed and well-structured TiC-Fe-Cr coating can be obtained in this test.TiC-Fe-Cr coating has good wear resistance and good load characteristics under dry sliding wear test conditions.展开更多
Fe-Cr-Ti-C composite powder was synthesized by precursor carbonization-composition process using the mixture of ferrotitanium, chromium, iron powder and precursor sucrose as raw material. And then the Fe-Cr-Ti-C coati...Fe-Cr-Ti-C composite powder was synthesized by precursor carbonization-composition process using the mixture of ferrotitanium, chromium, iron powder and precursor sucrose as raw material. And then the Fe-Cr-Ti-C coating was prepared by reactive plasma cladding method. Microstructure of the samples was observed by scanning electron microscope （SEM）, the phases were determined by X-ray diffraction （XRD）, and the wear resistance was evaluated under dry sliding wear test conditions at room temperature. Results indicate that the composite coating consists of primary austenite and dendritic eutectic austenite, chrysanthemum-shaped eutectic （Cr, Fe ） 7 C3 and TiC carbide. TiC presents the gradient distribution and different shapes in the coating, corresponding to equiaxial structure both in fusion zone and central zone, while it presents dendritic structure on the surface, respectively. The wear mass loss is insensitive to load for the coating while it increases rapidly for Q235 steel base metal in this test. The wear mass loss ofQ235 steel is 14 times as that of the composite coating under applied load of 40 kg.展开更多
基金National Natural Science Foundation of China (Grant No. 51905382)the Cooperation in Production and Education by Ministry of Education (Grant No. 201802252016)Weifang University Distinguished Professor Support Programme
文摘A certain amount of Ti was added to the plasma cladding Fe-Cr-C coating in the early stage in order to improve the quality and properties of the coating.Ti-Fe-Cr-C composite powder was prepared by precursor carbonization-composition process.In situ synthesized TiC-Fe-Cr coatings were fabricated on substrate of Q235 steel by plasma cladding process with the composite powder.Microstructures of the coatings with different process parameters,including cladding current,cladding speed,number of overlapping cladding layers,were analyzed by scanning electron microscope.The results show that the structure of the TiC-Fe-Cr coating is greatly affected by the cladding current,the cladding speed and the overlapping cladding process.In this test,when the cladding current of 300 A and the cladding process parameter of the cladding speed of 50 mm/min are clad with three layers,a well-formed and well-structured TiC-Fe-Cr coating can be obtained in this test.TiC-Fe-Cr coating has good wear resistance and good load characteristics under dry sliding wear test conditions.
基金Supported by Natural Science Foundation of Shandong Province （No. ZR2011EMM017 ）.
文摘Fe-Cr-Ti-C composite powder was synthesized by precursor carbonization-composition process using the mixture of ferrotitanium, chromium, iron powder and precursor sucrose as raw material. And then the Fe-Cr-Ti-C coating was prepared by reactive plasma cladding method. Microstructure of the samples was observed by scanning electron microscope （SEM）, the phases were determined by X-ray diffraction （XRD）, and the wear resistance was evaluated under dry sliding wear test conditions at room temperature. Results indicate that the composite coating consists of primary austenite and dendritic eutectic austenite, chrysanthemum-shaped eutectic （Cr, Fe ） 7 C3 and TiC carbide. TiC presents the gradient distribution and different shapes in the coating, corresponding to equiaxial structure both in fusion zone and central zone, while it presents dendritic structure on the surface, respectively. The wear mass loss is insensitive to load for the coating while it increases rapidly for Q235 steel base metal in this test. The wear mass loss ofQ235 steel is 14 times as that of the composite coating under applied load of 40 kg.
