Abstract: A powder composition is used for the fabrication of casting inserts, designed to produce local composite zones resistant to abrasive wear. The composite zones are reinforced with carbides and borides or with mixtures thereof formed in situ in castings. The powder includes powder reactants of the formation of carbides and/or borides selected from the group of TiC, WC, ZrC, NbC, TaC, TiB2, ZrB2, or mixtures thereof. The carbides and/or borides forming after crystallization particles reinforces the composite zones in castings. The powder composition further includes moderator powders in the form of a mixture of metal powders, which after crystallization form matrix of the composite zone in casting. A casting insert is disclosed for the fabrication in casting of local composite zones resistant to abrasive wear. A method for the fabrication of local composite zones in castings uses for this purpose the reaction of the self-propagating high temperature synthesis (SHS).

Abstract: A cast structural element of a pump, filter or compressor is disclosed with wear resistant layer comprising in situ produced composite material based on alloys, especially cast iron based alloys, reinforced with tungsten carbide in the form of crystals and/or particles, characterized by the microstructure of the composite material within the layer comprising faceted crystals and/or faceted particles tungsten carbide that provide uniform macroscopic and microscopic distribution, wherein the crystals and/or particles of tungsten carbide include irregular and/or round and/or oval nano and/or micro-areas filled with alloy based on metal. A method of producing the cast structural element in the form of a pump, filter or compressor is also disclosed.

Abstract: A composite material is disclosed based on in situ produced alloys, especially iron based alloys, reinforced with tungsten carbide in the form of crystals and/or particles, that can be characterized by the fact that the microstructure of the composite material within the composite layer and/or the composite zone comprises faceted crystals and/or faceted particles tungsten carbide that provide uniform macroscopic and microscopic distribution, wherein the crystals and/or particles of tungsten carbide include irregular and/or round and/or oval nano and/or micro-areas filled with alloy based on metal. Compositions of powders used to produce the composite material and methods of its production as well as to cast working element made of such composite materials or using the method are disclosed.

Abstract: A powder composition is used for the fabrication of casting inserts, designed to produPce local composite zones resistant to abrasive wear. The composite zones are reinforced with carbides and borides or with mixtures thereof formed in situ in castings. The powder includes powder reactants of the formation of carbides and/or borides selected from the group of TiC, WC, ZrC, NbC, TaC, TiB2, ZrB2, or mixtures thereof. The carbides and/or borides forming after crystallization particles reinforces the composite zones in castings. The powder composition further includes moderator powders in the form of a mixture of metal powders, which after crystallization form matrix of the composite zone in casting. A casting insert is disclosed for the fabrication in casting of local composite zones resistant to abrasive wear. A method for the fabrication of local composite zones in castings uses for this purpose the reaction of the self-propagating high temperature synthesis (SHS).

Abstract: A powder composition is used for the fabrication of casting inserts designed to produce local composite zones resistant to abrasive wear. The composite zones are reinforced with carbides and borides or with mixtures thereof formed in situ in castings. The powder includes powder reactants of the formation of carbides and/or borides selected from the group of TiC, WC, ZrC, NbC, TaC, TiB2, ZrB2, or mixtures thereof. The carbides and/or borides forming after crystallization particles reinforces the composite zones in castings. The powder composition further includes moderator powders in the form of a mixture of metal powders, which after crystallization form matrix of the composite zone in casting. A casting insert is disclosed for the fabrication in casting of local composite zones resistant to abrasive wear. A method for the fabrication of local composite zones in castings uses for this purpose the reaction of the self-propagating high temperature synthesis (SHS).

Abstract: This invention relates to a powder composition used for the fabrication of casting inserts, designed to produce local composite zones resistant to abrasive wear. The composite zones are reinforced with carbides and borides or with mixtures thereof formed in situ in castings. The powder includes powder reactants of the formation of carbides and/or borides selected from the group of TiC, WC, ZrC, NbC, TaC, TiB2, ZrB2, or mixtures thereof. The carbides and/or borides forming after crystallization particles reinforcing the composite zones in castings. The powder composition further includes moderator powders in the form of a mixture of metal powders, which after crystallization form matrix of the composite zone in casting.