Wearing element with enhanced wear resistance
AssigneeMetalogenia, S.L.
InventorsJordi Brufau Guinovart, Jorge Alcala, Jorge Triginer Boixeda, Jose Sanchez, Jose Lopez Almendros
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Abstract
Wearing element with enhanced wear resistance related to wearing elements, such as cast steel teeth to be specially used in machinery for earth-moving, ground-engaging and/or rock-cutting applications, as well as to inserts to be included within the wearing elements, to enhance their wear resistance thus prolonging their service life.
Claims19
A wearing element for earth engaging machines comprising:
- a gravity-cast steel surrounding and bonded to at least one bulk insert of a cemented tungsten carbide cermet, said insert comprising tungsten carbide grains with a metallic cementing matrix, said wearing element comprising:
- a substitution bonding zone, wherein the steel replaces the cementing matrix metal of the insert, to form a zone in which tungsten carbide grains are surrounded by steel;
- a precipitation bonding zone, comprising a tungsten-rich phase, composed of tungsten and iron, and at least one of coarsened grains of tungsten carbide or precipitated grains of tungsten carbide;
- and
- a tungsten-carbide-free bonding zone, comprising an iron-rich metallic phase comprising iron and tungsten.
Process for producing a wearing element for earth engaging machines having a gravity-cast steel surrounding and bonded to at least one bulk insert of a cemented tungsten carbide cermet, said insert comprising tungsten carbide grains with a metallic cementing matrix, the process comprising:
- pouring liquid steel around the insert at a temperature that is sufficiently high so as to melt, displace, and penetrate the cementing matrix metal of the cermet, as well as to dissolve the tungsten carbide of the cermet in an outer layer of the penetrated cement matrix,
- forming a substitution bonding zone with a penetration of the steel into the cermet of a depth greater than 1.5 mm, and
- cooling the wearing element at an intensity that is sufficiently high to restrict the diffusion of tungsten and carbon to obtain a tungsten-carbide-free bonding zone with an iron-rich metallic phase with a thickness greater than 20 μm.
A wearing element for excavation machines comprising:
- a steel surrounding and bonded to at least one bulk insert of a cemented tungsten carbide cermet, said insert comprising tungsten carbide grains with a metallic cementing matrix;
- a substitution bonding zone, wherein the steel replaces the cementing matrix metal of the insert;
- a precipitation bonding zone, comprising a tungsten-rich phase, wherein the tungsten-rich phase comprises tungsten and iron;
- and
- a tungsten-carbide-free bonding zone, comprising an iron-rich metallic phase, wherein the iron-rich metallic phase comprises iron and tungsten.
Dependencies are inferred from the claim text.