Nanometer niobium carbide/carbon nanotube reinforced diamond composite and a preparation method thereof

Patent metadata

Field	Value
Publication number	US-11453597-B2
Application number	US-202016802613-A
Country	US
Kind code	B2
Filing date	Feb 27, 2020
Priority date	Apr 4, 2019
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

A nanometer niobium carbide/carbon nanotube reinforced diamond composite and a preparation method thereof, belonging to the field of materials science. The nanometer niobium carbide/carbon nanotube reinforced diamond composite is composed of nanometer niobium carbide/carbon nanotube composite powders, matrix powders and diamond grains, wherein the nanometer niobium carbide/carbon nanotube composite powders are the composites of nanometer niobium carbide which are evenly distributed in the surface defects and interior of the carbon nanotube, the nanometer niobium carbide/carbon nanotube reinforced diamond composite is prepared by mixing the nanometer niobium carbide/carbon nanotube composite powders, matrix powders and diamond grains uniformly and sintering with a hot pressing technique.

First claim

What is claimed is:

1. A method for preparing a nanometer niobium carbide/carbon nanotube reinforced diamond composite, comprising the following step:
(1) preparing nanometer niobium carbide/carbon nanotube composite powders; by,
weighing nanometer niobium carbide and carbon nanotube at a mass ratio of (5˜10):1, which are added into distilled water respectively and ultrasonic dispersed for 0.5 h˜1 h, giving an aqueous dispersion of nanometer niobium carbide and an aqueous dispersion of carbon nanotube; thereafter, magnetically stirring the aqueous dispersion of nanometer niobium carbide and slowly adding the aqueous dispersion of carbon nanotube dropwise, and drying in vacuum after 30 min to obtain the composite powders, adding the composite powders into a hard alloy ball-milling tank, into which are additionally added hard alloy grinding balls, wherein the ratio of grinding balls to materials is 40:1, the ball-milling rate is 400 r/min, the time for ball-milling is 3 h˜6 h, and dried in vacuum to obtain nanometer niobium carbide/carbon nanotube composite powders;
(2) preparing of nanometer niobium carbide/carbon nanotube/matrix composite powders; by,
weighing the nanometer niobium carbide/carbon nanotube composite powders obtained in step (1) and the matrix powders at weight percentages of nanometer niobium carbide/carbon nanotube composite powders of 0.5 wt %˜3 wt % and matrix powders of 97 wt %˜99.5 wt %, on which is then conducted the planetary ball milling, wherein the ratio of grinding balls to materials is 6:1, the ball-milling rate is 320 r/min, the time for ball-milling is 3 h˜6 h, and dried in vacuum to obtain nanometer niobium carbide/carbon nanotube/matrix composite powders;
(3) weighing the nanometer niobium carbide/carbon nanotube/matrix composite powders obtained in step (2) and diamond grains at volume percentages of nanometer niobium carbide/carbon nanotube/matrix composite powders of 70 vol %˜80 vol % and diamond grains of 20 vol %˜30 vol %, and then placed into a three-dimensional mixing machine to mix for 1 h˜3 h, giving mixed powders;
(4) charging into graphite moulds the mixed powders obtained in step (3), and sintering in a hot pressing sintering furnace, giving nanometer niobium carbide/carbon nanotube reinforced diamond composites.

2. The method for preparing a nanometer niobium carbide/carbon nanotube reinforced diamond composite of claim 1 , wherein the particle size of nanometer niobium carbide is 10 nm˜30 nm, the length of carbon nanotube is 10 um˜30 um, and the outer diameter is 20 nm˜70 nm.

3. The method for preparing a nanometer niobium carbide/carbon nanotube reinforced diamond composite of claim 1 , wherein the matrix powder in step (2) is composed of WC tungsten carbide powders at a mass fraction of 40%, 35% of 663 bronze powders, 15% of YG6 hard alloy powders, 5% of Ni nickel powders and 5% of Mn manganese powders.

4. The method for preparing a nanometer niobium carbide/carbon nanotube reinforced diamond composite of claim 3 , wherein the matrix powders are prepared as below: WC tungsten carbide powder at a mass fraction of 40%, 35% of 663 bronze powders, 15% of YG6 hard alloy powders, 5% of Ni nickel powders and 5% of Mn manganese powders are added into a hard alloy ball-milling tank, at the same time adding hard alloy grinding balls, wherein the ratio of grinding balls to materials is 6:1, the ball-milling rate is 320 r/min, the time for ball-milling is 1 h˜2 h, and then dried in vacuum to obtain the matrix powder.

5. The method for preparing a nanometer niobium carbide/carbon nanotube reinforced diamond composite of claim 3 , wherein the particle size of WC tungsten carbide powder is −200 meshes, the particle size of 663 bronze powder is −200 meshes, the particle size of YG6 hard alloy powder is −300 meshes, the particle size of Ni nickel powder is −200 meshes, and the particle size of Mn manganese powder is −200 meshes.

6. The method for preparing a nanometer niobium carbide/carbon nanotube reinforced diamond composite of claim 1 , wherein the diamond grains are artificial diamond monocrystals which are 40 meshes˜100 meshes in size.

7. The method for preparing a nanometer niobium carbide/carbon nanotube reinforced diamond composite of claim 1 , wherein the ball-milling medium used during the ball-milling of step (1) is absolute ethanol.

8. The method for preparing a nanometer niobium carbide/carbon nanotube reinforced diamond composite of claim 1 , wherein the sintering process in step (4) is as below: within 300 s, the temperature of mixed powders is increased to 980° C., the pressure is increased from 0 MPa to 18 MPa, keeping the sintering temperature at 980° C. and the pressure at 18 MPa, with a holding time of 300 s; and then within 300 s, the temperature is reduced to 450° C., the pressure is reduced to 6 Mpa; finally withdrawing the pressure and cooling naturally to room temperature.

9. A nanometer niobium carbide/carbon nanotube reinforced diamond composite prepared with the method of method of claim 1 .

10. A nanometer niobium carbide/carbon nanotube reinforced diamond composite prepared with the method of claim 2 .

11. A nanometer niobium carbide/carbon nanotube reinforced diamond composite prepared with the method of claim 3 .

12. A nanometer niobium carbide/carbon nanotube reinforced diamond composite prepared with the method of claim 4 .

13. A nanometer niobium carbide/carbon nanotube reinforced diamond composite prepared with the method of claim 5 .

14. A nanometer niobium carbide/carbon nanotube reinforced diamond composite prepared with the method of claim 6 .

15. A nanometer niobium carbide/carbon nanotube reinforced diamond composite prepared with the method of claim 7 .

16. A nanometer niobium carbide/carbon nanotube reinforced diamond composite prepared with the method of claim 8 .

Assignees

• Univ Jilin

Inventors

• Liu Baochang
• Dai Wenhao
• Li Siqi
• Han Zhe
• Zhao Xinzhe
• Wang Shujing

Classifications

• C01G33/003

  Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange · CPC title

• C01B32/26 Primary

  Preparation (by using ultra-high pressure B01J3/06; by crystal growth C30B29/04) · CPC title

• C01B32/174 Primary

  Derivatisation; Solubilisation; Dispersion in solvents · CPC title

• C01B32/25

  Diamond · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title