COMPOSITE MATERIAL BASED ON IN_SITU PRODUCED ALLOYS REINFORCED WITH TUNGSTEN CARBIDE AND METHODS FOR ITS PRODUCTION Russian patent published in 2023 - IPC B22D19/02 B22F7/06 C22C1/05 B22F3/23 C22C29/06 

FIELD: powder metallurgy.

SUBSTANCE: present invention relates to a composite material based on alloys produced in situ, in particular iron-based alloys, reinforced with tungsten carbide in the form of crystals and/or particles. It can be used for the manufacture of wear parts of machines. A composite material based on iron-based alloys reinforced with tungsten carbide in the form of crystals and/or particles is obtained in the form of a composite layer or composite zone of a cast structural element. The composite material is formed by applying to the cavity or core of the mould a liquid reactive casting coating comprising a mixture of powders comprising tungsten in the range from 90 to 97 wt.% and carbon in the range from 3 to 10 wt.%, and a carrier, or introducing into the mould cavity of at least one casting liner obtained by pressing a mixture comprising tungsten and carbon. An iron-based alloy of high temperature at the same time, the heat coming from the liquid alloy in the form of high temperature is then poured into the mould cavity to provide the energy needed to initiate the in-situ reaction of the ceramic phase in the form of at least one type of tungsten carbide or tungsten carbide with other types of carbides added, which undergo a self-propagating high temperature fusion reaction and are a catalyst for the tungsten carbide synthesis reaction. The microstructure of the composite material comprises faceted crystals and/or faceted particles of tungsten carbide, providing a uniform macroscopic and microscopic distribution, which comprise nano- and/or microregions of irregular and/or round and/or oval shape, filled with a metal-based alloy.

EFFECT: high hardness and resistance to abrasive wear within the working surfaces.

18 cl, 19 dwg, 2 tbl, 8 ex