IPC분류정보
국가/구분 |
United States(US) Patent
공개
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0744964
(2015-11-17)
|
공개번호 |
US-0209019
(2018-07-26)
|
우선권정보 |
CN-201510465155.7 (2015-07-31) |
국제출원번호 |
PCT/CN2015/094749
(2015-11-17)
|
발명자
/ 주소 |
- ZHANG, Hao
- ZHANG, Zhongjian
- XU, Tao
- ZHANG, Weibing
- Kong, Defang
- Zhang, Donghua
|
출원인 / 주소 |
- ZHUZHOU CEMENTED CARBIDE GROUP CORP. LTD.
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
0 |
초록
A wolfram carbide based hard alloy includes a wolfram carbide base having a first binder. A plurality of hard particles with different sizes are dispersed in the wolfram carbide base, and hardness of the hard particles is larger than hardness of the wolfram carbide base.
대표청구항
▼
1. A wolfram carbide based hard alloy, comprising a wolfram carbide base including a first binder, wherein a plurality of hard particles with different sizes are dispersed in the wolfram carbide base, and hardness of the hard particles is larger than hardness of the wolfram carbide base. 2. The allo
1. A wolfram carbide based hard alloy, comprising a wolfram carbide base including a first binder, wherein a plurality of hard particles with different sizes are dispersed in the wolfram carbide base, and hardness of the hard particles is larger than hardness of the wolfram carbide base. 2. The alloy according to claim 1, wherein the hard particles comprise first hard particles having a first size and second hard particles having a second size, wherein a ratio of the first size to the second size is in a range from 1:5 to 1:7. 3. The alloy according to claim 2, wherein hardness of the first hard particles is larger than hardness of the second hard particles. 4. The alloy according to claim 2, wherein the first hard particles comprise wolfram carbide and a second binder, and the second hard particles comprise wolfram carbide and a third binder, wherein a weight content of the first binder in the wolfram carbide base is larger than a weight content of the second binder in the first hard particles, and the weight content of the second binder in the first hard particles is larger than a weight content of the third binder in the second hard particles. 5. The alloy according to claim 4, wherein the first binder, the second binder, and the third binder are all cobalt. 6. The alloy according to claim 5, wherein a weight content of cobalt in the wolfram carbide base is in a range from 7% to 40%; a weight content of cobalt in the first hard particles is in a range from 6% to 13%; and a weight content of cobalt in the second hard particles is in a range from 5% to 12%, and wherein, preferably, the weight content of cobalt in the wolfram carbide base is in a range from 10% to 20%; the weight content of cobalt in the first hard particles is in a range from 8% to 13%;and the weight content of cobalt in the second hard particles is in a range from 5% to 10%. 7. The alloy according to claim 6, wherein, in the alloy, a weight content of the wolfram carbide base is in a range from 10% to 30%; a weight content of the first hard particles is in a range from 18% to 24%; and a weight content of the second hard particles is in a range from 52% to 66%. 8. A method for preparing a wolfram carbide based hard alloy according to claim 1, wherein a first binder is cobalt, and hard particles comprise first hard particles having a first hardness and a first size and second hard particles having a second hardness and a second size, wherein the method comprises steps of: mixing wolfram carbide powder with cobalt uniformly so as to prepare first particles;mixing wolfram carbide powder with cobalt uniformly so as to prepare second particles;mixing wolfram carbide powder with cobalt uniformly so as to prepare base slurry;coating surfaces of the first particles and surfaces of the second particles with a layer of the base slurry so as to form unit granules; andsintering by hot-pressing a plurality of unit granules so as to obtain the wolfram carbide based hard alloy, wherein the base slurry on surfaces of the first particles and surfaces of the second particles forms a base of the wolfram carbide based hard alloy; the first particles form the first hard particles; and the second particles form the second hard particles, andwherein a weight content of cobalt in the first hard particles is larger than a weight content of cobalt in the second hard particles, and the weight content of cobalt in the second hard particles is less than a weight content of cobalt in the base slurry. 9. The method according to claim 8, wherein a temperature of sintering by hot-pressing is in a range from 1320° C. to 1350° C., and a pressure thereof is in a range from 80 MPa to 100 MPa. 10. The method according to claim 8, wherein a size of the first hard particles is smaller than a size of the second hard particles. 11. The alloy according to claim 3, wherein the first hard particles comprise wolfram carbide and a second binder, and the second hard particles comprise wolfram carbide and a third binder, wherein a weight content of the first binder in the wolfram carbide base is larger than a weight content of the second binder in the first hard particles, and the weight content of the second binder in the first hard particles is larger than a weight content of the third binder in the second hard particles. 12. The alloy according to claim 11, wherein the first binder, the second binder, and the third binder are all cobalt. 13. The alloy according to claim 12, wherein a weight content of cobalt in the wolfram carbide base is in a range from 7% to 40%; a weight content of cobalt in the first hard particles is in a range from 6% to 13%; and a weight content of cobalt in the second hard particles is in a range from 5% to 12%, and wherein, preferably, the weight content of cobalt in the wolfram carbide base is in a range from 10% to 20%; the weight content of cobalt in the first hard particles is in a range from 8% to 13%; and the weight content of cobalt in the second hard particles is in a range from 5% to 10%. 14. The alloy according to claim 13, wherein, in the alloy, a weight content of the wolfram carbide base is in a range from 10% to 30%; a weight content of the first hard particles is in a range from 18% to 24%; and a weight content of the second hard particles is in a range from 52% to 66%. 15. The method according to claim 10, wherein a size of the first hard particles is smaller than a size of the second hard particles.
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