Body comprising hard face structure and method for making same

摘要

A body, such as a pick tool for cutting coal, includes a steel substrate and a hard face structure fused to the steel substrate. The hard face structure includes at least 1 weight percent Si, at least 5 weight percent Cr and at least 40 weight percent W. Substantially the balance of the hard face structure includes carbon and an iron group metal M selected from Fe, Co, Ni and alloy combinations of these elements. The hard face structure includes a plurality of elongate or platelike micro-structures having a mean length of at least 1 micron, a plurality of nano-particles having a mean size of less than 200 nanometers, and a binder material.

主权项

1. A body comprising a steel substrate and a hard face structure fused to the steel substrate, in which the hard face structure comprises at least 1 weight percent Si, at least 5 weight percent Cr and at least 40 weight percent W and substantially the balance of the hard face structure consisting essentially of an iron group metal M and carbon C, M being selected from the group consisting of Fe, Co, Ni and alloy combinations of these elements; the hard face structure including a plurality of elongate micro-structures having a mean length of at least 1 micron, a plurality of nano-particles having a mean size of less than 200 nanometers, and a binder material; the micro-structures comprising more than 1 weight percent Cr and a phase having the formula MxWyCz, where x is in the range from 1 to 7, y is in the range from 1 to 10 and z is in the range from 1 to 4; the nano-particles comprising more than 20 weight percent W, the metal M, and C; and the binder material comprising more than 3 weight percent W, more than 2 weight percent Cr, more than 0.5 weight percent Si, the metal M and C.