Cermet powder

Abstract

A powder material of the present invention contains ceramic-metal composite particles, wherein at least a part of the composite particles exhibit no breaking point in a stress-strain diagram obtained by applying a compressive load that increases up to a maximum value of 10 mN or more at a loading rate of 15.0 mN/s or less.

1 . A powder material comprising ceramic-metal composite particles, wherein at least a part of the composite particles exhibit no breaking point in a stress-strain diagram that is obtained by applying a compressive load that increases up to a maximum value of 10 mN or more at a loading rate of 15.0 mN/s or less. 
     
     
         2 . The powder material according to  claim 1 , wherein the composite particles have a proportion of the composite particles exhibiting no breaking point of 10% or more. 
     
     
         3 . The powder material according to  claim 1 , wherein the composite particles each include metal particle portions having an average diameter of 3 μm or less. 
     
     
         4 . The powder material according to  claim 1 , wherein the composite particles each include metal particle portions and ceramic particle portions and have a ratio of an average diameter of the metal particle portions to an average diameter of the ceramic particle portions of less than 1.5. 
     
     
         5 . The powder material according to  claim 1 , wherein the composite particles each include metal particle portions and ceramic particle portions and have a ratio of an average diameter of the metal particle portions to an average diameter of the ceramic particle portions of less than 1.5, and the average diameter of the metal particle portions is 3 μm or less. 
     
     
         6 . The powder material according to  claim 1 , wherein the composite particles each include metal particle portions, and a ratio of an average diameter of the metal particle portions to an average diameter of the composite particles is 0.15 or less. 
     
     
         7 . The powder material according to  claim 1 , wherein the composite particles have an aspect ratio of 1.30 or less. 
     
     
         8 . The powder material according to  claim 1 , wherein the composite particles each include pores having a median diameter of 2.0 μm or less. 
     
     
         9 . The powder material according to  claim 1 , wherein the composite particles have a porosity of 30% or less. 
     
     
         10 . The powder material according to  claim 1 , wherein the powder material is used as a thermal spray powder. 
     
     
         11 . The powder material according to  claim 10 , wherein the powder material is thermally sprayed at a thermal spraying temperature of 3,000° C. or lower. 
     
     
         12 . A method for forming a thermal spray coating, comprising thermally spraying the powder material according to  claim 1  at a thermal spraying temperature of 3,000° C. or lower. 
     
     
         13 . The powder material according to  claim 1 , wherein the at least a part of the composite particles exhibit no breaking point in a stress-strain diagram that is obtained by applying a compressive load that increases up to a maximum value of 100 mN or more at a loading rate of 15.0 mN/s or less. 
     
     
         14 . The powder material according to  claim 1 , wherein the composite particles each include ceramic particle portions containing at least one selected from tungsten carbide, chromium carbide, molybdenum boride, chromium boride, and aluminum nitride. 
     
     
         15 . The powder material according to  claim 1 , wherein the composite particles each include metal particle portions having a face-centered cubic lattice structure or a body-centered cubic lattice structure. 
     
     
         16 . A powder material comprising ceramic-metal composite particles, wherein
 at least 10% of the composite particles exhibit no breaking point in a stress-strain diagram that is obtained by applying a compressive load that increases up to a maximum value of 200 mN or more at a loading rate of 15.0 mN/s or less,   the composite particles each include ceramic particle portions containing tungsten carbide and metal particle portions containing cobalt, nickel, iron, or chromium, the composite particles have a ratio of an average diameter of the metal particle portions to an average diameter of the ceramic particle portions of less than 1,   the average diameter of the metal particle portions is 1 μm or less,   a ratio of the average diameter of the metal particle portions to the average diameter of the composite particles is 0.1 or less, and   the composite particles each include pores having a median diameter of 2.0 μm or less.