CN1015646B - Microwave sintering process of w-co carbide hard metals - Google Patents
Microwave sintering process of w-co carbide hard metalsInfo
- Publication number
- CN1015646B CN1015646B CN 90109258 CN90109258A CN1015646B CN 1015646 B CN1015646 B CN 1015646B CN 90109258 CN90109258 CN 90109258 CN 90109258 A CN90109258 A CN 90109258A CN 1015646 B CN1015646 B CN 1015646B
- Authority
- CN
- China
- Prior art keywords
- sintering
- microwave
- microwave sintering
- present
- sintered
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
The present invention relates to a method for the microwave sintering of tungsten carbide-cobalt hard alloy. A blank shaped with the conventional method is sent to a cavity of a microwave sintering furnace to be sintered in a hydrogen atmosphere, sintering temperature is 1250 degrees(+/-)50DEGC, and sintering time is 10 min. Compared with the conventional method, the present invention has the advantages of high temperature rise speed, short sintering time shortened by 1/2 to 1/3, energy source saving and high production efficiency. The WC-Co hard alloy sintered with the method of the present invention has the advantages of fine crystal grain, good bending strength and toughness and high hardness.
Description
The invention belongs to the synthetic method of powder metallurgy, a kind of specifically sintering method of WC-Co series hard alloy.
In the prior art, preparation WC-Co series hard alloy adopts resistance furnace or induction furnace to carry out sintering mostly.Adopt this type of sintering method, need lower temperature rise rate and long heating period for obtaining uniform sintered compact.Be to shorten sintering time, people attempt at the thermal shock resistance that improves body of heater or improve on the heat transfer type in the furnace chamber and take measures, and produce thermal stresses and cause material rimose problem but these measures run in temperature-rise period the material internal non-uniform temperature again.In addition, the toughness of stupalith is an important indicator of stupalith, is to reduce its grain-size and improve one of stupalith flexible effective way, promptly forms close grain or superfine crystal particle, and this can't finish above-mentioned normal sintering method.
The research of microwave sintering starts from the seventies, in recent years, some microwave sintering Al is arranged
2O
3, ZrO
2, SiC, B
4The research report of pottery such as C and some crystal whisker excess weld metal toughening ceramics, but the relevant any report that adopts microwave sintering WC-Co series hard alloy of Shang Weijian.
The sintering method that the purpose of this invention is to provide a kind of new WC-Co Wimet adopts this method, can be under lower temperature, realize the densification sintering of WC-Co series hard alloy in relatively shorter time.
The objective of the invention is to realize in the following manner, to send in the microwave sintering furnace cavity with the base substrate of ordinary method moulding, in microwave cavity, feed hydrogen stream, start microwave source, heat up with 100-150 ℃/minute temperature rise rate, insulation is 10 minutes behind temperature rise to 1250 ± 50 ℃, cuts off microwave source, after the intravital temperature in chamber to be sintered is reduced to normal temperature, take out sintered compact.
The present invention utilizes to be sintered kinetic energy and the heat energy that the bulk absorption micro-wave energy is converted into molecule, realizes its densification sintering with a kind of " mode of body heating " whole even heating to certain temperature.Adopt that the present invention can insulation 10-20 divides the Fast Sintering that realizes the WC-Co Wimet under normal sintering 100-200 ℃ the temperature being lower than, whole sintering time shortens 1/2-1/3 than the sintering time of ordinary method.The present invention has save energy, enhances productivity, improves the material structure tissue, improves advantages such as material property.
Embodiment: with WC-94%, Co-6%, add TaC-0.5% after conventional technology is made the sample base outward, send in the microwave sintering furnace cavity.In microwave cavity, feed hydrogen stream.Start microwave source, heat up, 1250 ± 50 ℃ of following heat preservation sinterings 10 minutes with 100-150 ℃/minute temperature rise rate.Cut off microwave source, be cooled to normal temperature, take out and promptly get the tungsten-cobalt carbide Wimet.
Present embodiment agglomerating WC-Co Wimet is contrasted comparing result such as following table with using ordinary method agglomerating WC-Co Wimet: (table is seen the literary composition back)
Contrast as seen from table, the present invention is faster than ordinary method heat-up rate, and the sintering period is short, save energy, production efficiency height.The WC-Co Wimet crystal grain that goes out by sintering of the present invention is thin, and bending strength is good, good toughness, the hardness height.
Sintering method
The microwave sintering normal sintering
The contrast project
Heat-up rate 100-150 ℃/minute 20-30 ℃/minute
1230 ℃ 1460 ℃ of sintering temperatures
Soaking time 10 minutes 60 minutes
30 minutes 180 minutes sintering period
Mean grain size 0.8 μ 1.2 μ
Bending strength 2100MPa 1700MPa
Hardness HRA92.5-93 HRA92
Claims (1)
1, the microwave sintering method of tungsten-cobalt carbide Wimet, it is characterized in that it is to send in the microwave sintering furnace cavity with the base substrate of ordinary method moulding, in microwave cavity, feed hydrogen stream, start microwave source, heat up with 100-150 ℃/minute temperature rise rate, insulation is 10 minutes behind temperature rise to 1250 ± 50 ℃, cuts off microwave source, after the intravital temperature in chamber to be sintered is reduced to normal temperature, take out sintered compact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90109258 CN1015646B (en) | 1990-11-16 | 1990-11-16 | Microwave sintering process of w-co carbide hard metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90109258 CN1015646B (en) | 1990-11-16 | 1990-11-16 | Microwave sintering process of w-co carbide hard metals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1050908A CN1050908A (en) | 1991-04-24 |
| CN1015646B true CN1015646B (en) | 1992-02-26 |
Family
ID=4881348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90109258 Expired CN1015646B (en) | 1990-11-16 | 1990-11-16 | Microwave sintering process of w-co carbide hard metals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015646B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357180C (en) * | 2006-04-07 | 2007-12-26 | 北京科技大学 | Method of microwave synthetizing nano powder of tungsten carbide |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4340652C2 (en) * | 1993-11-30 | 2003-10-16 | Widia Gmbh | Composite and process for its manufacture |
| CN100453217C (en) * | 2007-01-11 | 2009-01-21 | 武汉理工大学 | Sintering method of WC-Co cemented carbide |
| DE102011117042B4 (en) | 2011-10-27 | 2019-02-21 | H. C. Starck Tungsten GmbH | A method of manufacturing a component comprising sintering a cemented carbide composition |
| CN102912207A (en) * | 2012-11-12 | 2013-02-06 | 湖南山联新材科技有限公司 | Method for producing hard alloys by using industrial microwave kiln |
| CN106282717A (en) * | 2016-08-19 | 2017-01-04 | 合肥东方节能科技股份有限公司 | A kind of method of hard alloy molding mill guide wheel based on microwave sintering |
-
1990
- 1990-11-16 CN CN 90109258 patent/CN1015646B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357180C (en) * | 2006-04-07 | 2007-12-26 | 北京科技大学 | Method of microwave synthetizing nano powder of tungsten carbide |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1050908A (en) | 1991-04-24 |
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| CF01 | Termination of patent right due to non-payment of annual fee |