Process for preparing Mo2FeB2-based metal ceramic

Abstract

The invention discloses a process for preparing Mo2FeB2-based metal ceramic. The process comprises the following steps: firstly selecting high-purity Fe2B powder and Mo powder as raw materials, controlling weight ratio at (0.25-0.5):(0.75-0.5), adding a small amount of absolute ethyl alcohol as a process control agent, weighing, and then carrying out vacuum ball milling for 5-25 hours; then filling mixed powder into a metal mould for compression moulding forming; and finally placing a compression moulding forming blank into a graphite mould, carrying out pressureless sintering in a vacuum sintering furnace at the sintering temperature of 1250-1350 without carrying out heat insulation treatment, and after the sintering is finished, cooling with the vacuum sintering furnace together. The process disclosed by the invention is simple in process. The Mo2FeB2-based metal ceramic prepared through the process disclosed by the invention has the advantages of higher relative density and good main mechanical property index, not only is suitable for an occasion in the filed of abrasion resistance, but also is used for the field of corrosion resistance.

Description

technical field [0001] The invention relates to a preparation technology of cermets, in particular to a preparation method of cermets composed of a hard phase (about 60%-80% by volume) and a binding phase. Background technique [0002] Mo 2 FeB 2 Base cermet (composed of hard phase Mo 2 FeB 2 and the binder phase Fe, in which the volume percentage of the hard phase is generally controlled between 60%-80%) has excellent comprehensive properties and has broad application prospects in the fields of wear resistance and corrosion resistance. Mo can also be used 2 FeB 2 Cermet has good bonding performance with steel. It adopts welding or combined sintering method to form a coating with excellent wear resistance and corrosion resistance on the surface of high-strength steel substrate. It can be applied to roll rings of high-speed wire-lined rolling mills, The sliding plate in the coal mine, the protective plate of the nuclear reactor, the armor plate of the tank, the scraper o...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic and foreign preparations of Mo 2 FeB 2 The raw materials used in the base cermet are mainly ferroboron powder, hydroxyl iron powder and molybdenum powder (reported in a large number of literatures), however, due to the high amount of inherent silicon in the boron-iron powder, the formed during the sintering process A large number of brittle compounds such as silicon-boron, silicon-molybdenum, etc. 2 FeB 2 The mechanical properties of the base cermet are greatly damaged, making it unable to achieve the best performance

For this reason, the Chinese patent CN102618769A provides the successful preparation of Mo with BN, hydroxyl iron and molybdenum as raw materials 2 FeB 2 cermet, but this method needs to add a forming agent (gasoline rubber), a debinding stage is required during the sintering process, and heat preservation treatment is required when the debinding is completed and the final sintering is completed, which undoubtedly increases the preparation cycle; in addition, due to There are three kinds of substances in the raw materials. In the early powder mixing process, the mixing uniformity of the powder must be strictly controlled, otherwise other hard phases will appear during the reaction and sintering process, and the preparation of high-performance Mo 2 FeB 2 The ultimate goal of base metal ceramics

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