Preparation Technology And Performance Study Of Iron-based Alloy Powder Block Carbon Arc Surfacing Composite Middle Plate

This paper，putting the simple operation, low cost, and the electrodes in the combustionprocess which can produce a lot of shielding gas as the arc surfacing welding method, putting thehigh hardness and excellent value wear-resistant alloy Fe-Cr-C as surfacing materials, researchesthe Preparation of the alloy powder block, the automatic carbon arc welding technology and theeffect of the alloying elements boron, niobium on the microstructure and performance ofFe-Cr-C department surfacing layer. This paper also provids some theoretical basis and practicalexperience for the preparation of the mine useing scraper conveyor middle plate.The results show that: when the amount of sodium silicate is10%, the alloy powder blockmolding best; when the the surfacing current is300A, the most smooth and beautiful corrugateduniform of the surfacing layer. With the increase of the B content (0-2.5%), macro hardness andwear resistance of the surfacing layer are upward trend; with increasing Nb content (0-5%) themacro hardness and wear resistance of the surfacing layer is first increased and then decreased.A large number of carbide strengthening phase dispersed with the performance of the base bodyhaving a good support is the key of the Fe-Cr-C with excellent wear resistance. The preparationof Fe-Cr-C alloy powder block automatic carbon arc surfacing composite board is penetrated andno flaking; When the boron content are1.3%,2.5%, the niobium content are1%,3%,5%, thehardnesses of the surfacing layer are greater than HRC58and they can satisfy the technicalrequirements of the middle plate in the the scraper conveyor.