Hollow sphere structure of metal-containing tungsten carbide, method for manufacturing the same, method for manufacturing film

Abstract

A hollow sphere structure of metal-containing tungsten carbide is provided, which includes a porous shell of metal-containing metal carbide surrounding a hollow core. The hollow sphere structure has a diameter of 5 micrometers to 45 micrometers, and the porous shell has a thickness of 0.1 micrometers to 12 micrometers. The metal is cobalt, nickel, or a combination thereof.

What is claimed is: 
     
         1 . A hollow sphere structure of metal-containing tungsten carbide, comprising:
 a porous shell of metal-containing tungsten carbide surrounding a hollow core,   wherein the hollow sphere structure has a diameter of 5 micrometers to 45 micrometers, the porous shell has a thickness of 0.1 micrometers to 12 micrometers, and the metal is cobalt, nickel, or a combination thereof.   
     
     
         2 . The hollow sphere structure of metal-containing tungsten carbide as claimed in  claim 1 , wherein an inner surface or an outer surface of the porous shell has a worm-shaped structure or a multi-edge angle structure. 
     
     
         3 . The hollow sphere structure of metal-containing tungsten carbide as claimed in  claim 1 , wherein the porous shell has a plurality of pores, and the pores have a diameter of 0.3 micrometers to 2 micrometers. 
     
     
         4 . The hollow sphere structure of metal-containing tungsten carbide as claimed in  claim 1 , wherein the porous shell is formed of a plurality of connected metal-containing tungsten carbide particles. 
     
     
         5 . The hollow sphere structure of metal-containing tungsten carbide as claimed in  claim 4 , wherein the metal-containing tungsten carbide particles have a metal formed on tungsten carbide particles. 
     
     
         6 . The hollow sphere structure of metal-containing tungsten carbide as claimed in  claim 4 , wherein the metal-containing tungsten carbide particles have a diameter of 0.05 micrometers to 0.6 micrometers. 
     
     
         7 . The hollow sphere structure of metal-containing tungsten carbide as claimed in  claim 4 , wherein the metal and the tungsten carbide particles of the metal-containing tungsten carbide particles have a weight ratio of 10:90 to 14:86. 
     
     
         8 . A method of forming a hollow sphere structure of metal-containing tungsten carbide, comprising:
 wet-dispersing a plurality of metal-containing tungsten carbide particles to form slurry; and   spray drying the slurry to connect the metal-containing tungsten carbide particles for forming the hollow sphere structure of metal-containing tungsten carbide,   wherein the hollow sphere structure of metal-containing tungsten carbide includes a porous shell of metal-containing tungsten carbide surrounding a hollow core,   wherein the hollow sphere structure has a diameter of 5 micrometers to 45 micrometers, the porous shell has a thickness of 0.1 micrometers to 12 micrometers, and the metal is cobalt, nickel, or a combination thereof.   
     
     
         9 . The method as claimed in  claim 8 , wherein the porous shell has a plurality of pores, and the pores have a diameter of 0.3 micrometers to 2 micrometers. 
     
     
         10 . The method as claimed in  claim 8 , wherein the metal-containing tungsten carbide particles have a metal formed on tungsten carbide particles. 
     
     
         11 . The method as claimed in  claim 8 , wherein the metal-containing tungsten carbide particles have a diameter of 0.05 micrometers to 0.6 micrometers in the slurry. 
     
     
         12 . The method as claimed in  claim 8 , wherein the metal-containing tungsten carbide particles after spray drying include two grades, wherein Grade I particles have a diameter of 0.05 micrometers to 0.2 micrometers and Grade II particles have a diameter of 0.2 micrometers to 0.6 micrometers. 
     
     
         13 . The method as claimed in  claim 12 , wherein Grade I particles and Grade II particles have a weight ratio of 0.08 to 1. 
     
     
         14 . The method as claimed in  claim 8 , wherein the metal and the tungsten carbide particles of the metal-containing tungsten carbide particles have a weight ratio of 10:90 to 14:86. 
     
     
         15 . The method as claimed in  claim 8 , further sintering the hollow sphere structure of metal-containing tungsten carbide to form a worm-shaped structure or a multi-edge angle structure at an inner surface or an outer surface of the porous shell. 
     
     
         16 . A method for manufacturing a film, comprising:
 thermal spraying a hollow sphere structure of metal-containing tungsten carbide to form a metal-containing tungsten carbide film on a substrate,   wherein the hollow sphere structure of metal-containing tungsten carbide includes a porous shell of metal-containing tungsten carbide surrounding a hollow core,   wherein the hollow sphere structure has a diameter of 5 micrometers to 45 micrometers, the porous shell has a thickness of 0.1 micrometers to 12 micrometers, and the metal is cobalt, nickel, or a combination thereof.