CN100453217C - Sintering method of WC-Co cemented carbide - Google Patents
Sintering method of WC-Co cemented carbide Download PDFInfo
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- CN100453217C CN100453217C CNB2007100512476A CN200710051247A CN100453217C CN 100453217 C CN100453217 C CN 100453217C CN B2007100512476 A CNB2007100512476 A CN B2007100512476A CN 200710051247 A CN200710051247 A CN 200710051247A CN 100453217 C CN100453217 C CN 100453217C
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Abstract
The invention is a sintering method of WC-Co carbide alloy, namely: mixing Co and WC raw material powder uniformly, drying and pilling, pressing the powder to preparing green compact with press machine and putting it in container; putting container in microwave magnetic field which heats Co first, the WC is heated mostly by microwave and only absorbs the heat transferred from Co; then putting the WC-Co material heated by microwave magnetic field under microwave electric field to making the WC-Co main body is heated by microwave, insulation 5 to 10 minutes after reaching the required temperature by art, taking-up the container carrying WC-Co carbide alloy and completing the microwave magnetic field and electric field agglomeration of WC-Co carbide alloy, or no insulation after heating the WC-Co in microwave electric field and reaching the required art temperature, but putting the WC-Co in microwave magnetic field to completing the microwave magnetic field and electric field agglomeration of WC-Co carbide alloy. The invention has advantages of simple process, easy implement and high efficiency.
Description
Technical field
The present invention relates to WC-Co (tungsten-cobalt carbide) Hardmetal materials and microwave heating technique, the microwave magnetic field that particularly relates to a kind of WC-Co carbide alloy is in conjunction with the electric field sinter method.
Background technology
Existing heating using microwave, microwave sintering are studied the effect that the fuel factor of microwave energy mainly is summed up as dielectric loss, i.e. the effect of microwave electric field, and ignored the effect of magnetic field to material.Therefore, in the microwave sintering process, traditional practice is that material is placed microwave electric field or electromagnetic field, electric field and magnetic field branch is not come and uses stage by stage.Like this, because material all is in the strongest zone of microwave electric field when microwave sintering, make the Co high temperature under microwave electric field among the WC-Co very easily discharge, the surperficial moment of WC-Co is reached a high temperature, thereby make microwave sintering process out of control, cause the burning of sample, thereby do not give full play to the advantage of microwave sintering.
Summary of the invention
Technical problem to be solved by this invention is: the microwave magnetic field that a kind of WC-Co carbide alloy is provided is in conjunction with the electric field sinter method, with solve that Co high temperature under microwave field among the WC-Co very easily discharges and microwave sintering WC-Co carbide alloy process in the problem of thermal runaway, and technology is simple, easily enforcement and efficient.
The present invention solve technical scheme that its technical problem adopts be utilize microwave magnetic field and microwave electric field respectively be used for sintering WC-Co carbide alloy, concrete steps comprise:
(1) Co is mixed the back drying-granulating with the WC material powder, be pressed into green compact, put into container with press;
(2) container is placed microwave magnetic field, microwave magnetic field earlier heating Co and WC hardly by heating using microwave, the heat transferred WC that absorbs of Co just;
(3) will place microwave electric field through the WC-Co material after the microwave magnetic field heating, this moment, the microwave heating effect of WC played a major role, and made the main body of WC-Co by heating using microwave;
(4) after WC-Co reaches the temperature of technological requirement, be incubated 5-10 minute, the container that will load the WC-Co carbide alloy again takes out, and the microwave magnetic field of finishing the WC-Co carbide alloy is in conjunction with electric field sinter,
Perhaps, after WC-Co reaches the temperature of technological requirement, do not carry out insulating process in microwave electric field, and WC-Co is placed microwave magnetic field, the microwave magnetic field of finishing the WC-Co carbide alloy is in conjunction with electric field sinter.
The present invention compared with prior art, its major advantage is: the magnetic of having utilized metal Co, under microwave magnetic field to add thermal effect strong, so the microwave energy difficulty that almost is reflected is heated under microwave electric field, and WC under microwave electric field to add thermal effect strong, utilize the effect of microwave electric field and microwave magnetic field respectively, then can make full use of microwave energy, thereby avoided the problem that high temperature very easily discharges under microwave field of the Co among the WC-Co, fully utilized the effect in microwave electric field and magnetic field simultaneously, can control the problem of the grain growth of WC-Co effectively, realized heating efficiently, can save the energy, and technology is simple, implements easily.
The specific embodiment
Sintering process of the present invention is to utilize the effect of microwave magnetic field to material, the WC-Co green compact are placed microwave magnetic field earlier, microwave magnetic field earlier heating Co and WC hardly by heating using microwave, be the heat transferred WC that Co absorbs, after reaching 900～1100 ℃ of temperature, the WC-Co material that will have uniform temperature again places microwave electric field, this moment, the microwave heating effect of WC played a major role, after WC-Co reaches 1200～1340 ℃ of temperature of technological requirement, be incubated 5～10 minutes, the container that will load the WC-Co carbide alloy again takes out, or after WC-Co reaches the temperature of technological requirement, in microwave electric field, do not carry out insulating process, and WC-Co is placed microwave magnetic field, thereby the microwave magnetic field of having implemented the WC-Co carbide alloy is in conjunction with electric field sinter.This sintering process is first microwave magnetic field, microwave electric field again; Or first microwave magnetic field, microwave electric field, microwave magnetic field at last again.
Sintering process of the present invention can change according to actual conditions, promptly all right first microwave electric field, microwave magnetic field again; Perhaps first microwave electric field, microwave magnetic field, microwave electric field at last again.
Above-mentioned microwave magnetic field and microwave electric field, its corresponding microwave power all can be 1.0～5.0kW.
The invention will be further described below in conjunction with specific embodiment, but do not limit the present invention.
Embodiment 1: will contain weight ratio and be 10% Co and mix the back drying-granulating with WC powder, and be pressed into the green compact of the φ 17-25 * 7mm with certain initial density with press, and put into container; Container is placed microwave magnetic field, after the microwave heating temperature of Co reached 900～1100 ℃, armrest moves or mechanism moves to container in the microwave electric field, main body to WC-Co is carried out heating using microwave, reach after the sintering temperature of 1200～1340 ℃ of technological requirements the more moving or mechanism of armrest and move in the microwave magnetic field, thereby the microwave magnetic field of finishing the WC-Co carbide alloy is in conjunction with electric field sinter.
The selection of microwave power changes along with material powder average grain diameter and sample size different have some, and the power of typical microwave is generally selected 1.5kW.Manually or mechanism make the container extruding of back and promote the container of front, thereby realize the variation in microwave field of WC-Co material in the container from magnetic field-electric field-magnetic field.
Embodiment 2: according to the average grain diameter (nanometer, sub-micron, micron) and the Co powder content (6～25wt%) of Co powder and WC powder, suitably regulate the power (1～5kW of microwave, adjustable continuously) control the rate of heat addition, so that implement the microwave magnetic field of WC-Co carbide alloy better in conjunction with electric field sinter according to actual conditions.Other is with embodiment 1.
Embodiment 3: the microwave magnetic field of WC-Co carbide alloy in conjunction with the electric field sinter process in, can adopt mechanically operated mode, by controlling mechanically operated speed, the container extruding of back and the container of promotion front, thus realize automatically continuous sample presentation and control the position that WC-Co carbide alloy sample is in microwave electric field or magnetic field.Other is with embodiment 1 and 2.
Embodiment 4: will contain weight ratio and be 10% Co and mix the back drying-granulating with WC powder, and be pressed into the green compact of the φ 17-25 * 7mm with certain initial density with press, and put into container; Container is placed microwave magnetic field, after the microwave heating temperature of Co reached 900～1100 ℃, armrest moves or mechanism moves to container in the microwave electric field, main body to WC-Co is carried out heating using microwave, after reaching the sintering temperature of 1200～1340 ℃ of technological requirements, be incubated 5-10 minute, the container that will load the WC-Co carbide alloy again takes out, thereby the microwave magnetic field of finishing the WC-Co carbide alloy is in conjunction with electric field sinter.
The selection of microwave power changes along with material powder average grain diameter and sample size different have some, and the power of typical microwave is generally selected 1.5kW.Manually or mechanism make the container extruding of back and promote the container of front, thereby realize the variation in microwave field of WC-Co material in the container from magnetic field-electric field.
Embodiment 5: will contain weight ratio and be 10% Co and mix the back drying-granulating with WC powder, and be pressed into the green compact of the φ 17-25 * 7mm with certain initial density with press, and put into container; Container is placed microwave electric field, after the microwave heating temperature of WC-Co reached the sintering temperature of 1200～1340 ℃ of technological requirements, armrest moves or mechanism moves to container in the microwave magnetic field, be incubated 5-10 minute, the container that will load the WC-Co carbide alloy again takes out, thereby finishes the microwave electric field combined magnetic field sintering of WC-Co carbide alloy.
The selection of microwave power changes along with material powder average grain diameter and sample size different have some, and the power of typical microwave is generally selected 1.5kW.Manually or mechanism make the container extruding of back and promote the container of front, thereby realize the variation in microwave field of WC-Co material in the container from electric field-magnetic field.
Embodiment 6: will contain weight ratio and be 10% Co and mix the back drying-granulating with WC powder, and be pressed into the green compact of the φ 17-25 * 7mm with certain initial density with press, and put into container; Container is placed microwave electric field, after the microwave heating temperature of WC-Co reached the sintering temperature of 1200～1340 ℃ of technological requirements, armrest moves or mechanism moves to container in the microwave magnetic field, be incubated 3～5 minutes, moving or the mechanism of armrest moves to container in the microwave electric field again, thereby finishes the microwave electric field combined magnetic field sintering of WC-Co carbide alloy.
The selection of microwave power changes along with material powder average grain diameter and sample size different have some, and the power of typical microwave is generally selected 1.5kW.Manually or mechanism make the container extruding of back and promote the container of front, thereby realize WC-Co material in the container in microwave field from electric field-magnetic field-variation of electric field.
Claims (5)
1. the sintering method of a WC-Co carbide alloy, what it is characterized in that utilizing respectively microwave magnetic field and microwave electric field is used for sintering WC-Co carbide alloy, and concrete steps comprise:
(1) Co is mixed the back drying-granulating with the WC material powder, be pressed into green compact, put into container with press;
(2) container is placed microwave magnetic field, microwave magnetic field earlier heating Co and WC hardly by heating using microwave, the heat transferred WC that absorbs of Co just;
(3) will place microwave electric field through the WC-Co material after the microwave magnetic field heating, this moment, the microwave heating effect of WC played a major role, and made the main body of WC-Co by heating using microwave;
(4) after WC-Co reaches the temperature of technological requirement, be incubated 5～10 minutes, the container that will load the WC-Co carbide alloy again takes out, and the microwave magnetic field of finishing the WC-Co carbide alloy is in conjunction with electric field sinter;
Perhaps, after WC-Co reaches the temperature of technological requirement, do not carry out insulating process in microwave electric field, and WC-Co is placed microwave magnetic field, the microwave magnetic field of finishing the WC-Co carbide alloy is in conjunction with electric field sinter.
2. the sintering method of WC-Co carbide alloy according to claim 1, the microwave power that it is characterized in that described microwave magnetic field correspondence is 1.0～5.0kW.
3. the sintering method of WC-Co carbide alloy according to claim 1, the microwave power that it is characterized in that described microwave electric field correspondence is 1.0～5.0kW.
4. the sintering method of WC-Co carbide alloy according to claim 1 is characterized in that in the step (2) that microwave magnetic field is 900～1100 ℃ to the microwave heating temperature of Co.
5. the sintering method of WC-Co carbide alloy according to claim 1 is characterized in that in the step (3) that the temperature that microwave electric field is carried out the technological requirement of heating using microwave to the main body of WC-Co is 1200～1340 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100512476A CN100453217C (en) | 2007-01-11 | 2007-01-11 | Sintering method of WC-Co cemented carbide |
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| CNB2007100512476A CN100453217C (en) | 2007-01-11 | 2007-01-11 | Sintering method of WC-Co cemented carbide |
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| CN100453217C true CN100453217C (en) | 2009-01-21 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071386B (en) * | 2011-01-13 | 2012-03-07 | 中南大学 | Thermo-magnetic composite file processing technique for hard alloy |
| CN102382997B (en) * | 2011-10-24 | 2013-02-27 | 中南大学 | Method for preparing WC-Co cemented carbide through microwave sintering |
| CN102615283B (en) * | 2012-02-17 | 2013-10-02 | 湖南航天工业总公司 | Method for sintering radially-oriented sintering samarium cobalt integrated magnetic ring |
| CN103695685B (en) * | 2013-12-26 | 2016-02-24 | 昆明理工大学 | A kind of microwave sintering reaction prepares the method for WC-Co hard alloy |
| CN104190942B (en) * | 2014-08-19 | 2016-08-31 | 天津市华辉超硬耐磨技术有限公司 | A kind of microwave sintering method of hard alloy |
| CN107900328A (en) * | 2017-09-30 | 2018-04-13 | 重庆琅博宛冶金材料有限公司 | Powder furnace charge sintering equipment |
| CN109943761B (en) * | 2019-03-13 | 2021-04-20 | 河源富马硬质合金股份有限公司 | Extrusion method for producing hard alloy bar |
| CN112828290B (en) * | 2020-12-15 | 2023-03-31 | 晋城富联鸿刃科技有限公司 | Sintering method of hard alloy die and hard alloy die |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02101167A (en) * | 1988-10-06 | 1990-04-12 | Idemitsu Petrochem Co Ltd | Production of diamond coated member |
| CN1050908A (en) * | 1990-11-16 | 1991-04-24 | 武汉工业大学 | The microwave sintering method of tungsten-cobalt carbide Wimet |
| DE19725914A1 (en) * | 1997-03-10 | 1998-09-17 | Widia Gmbh | Carbide or cermet sintered body and process for its production |
| US20040175284A1 (en) * | 2002-10-23 | 2004-09-09 | Mckay John Russell | Method of cryogenic treatment of tungsten carbide containing cobalt |
-
2007
- 2007-01-11 CN CNB2007100512476A patent/CN100453217C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02101167A (en) * | 1988-10-06 | 1990-04-12 | Idemitsu Petrochem Co Ltd | Production of diamond coated member |
| CN1050908A (en) * | 1990-11-16 | 1991-04-24 | 武汉工业大学 | The microwave sintering method of tungsten-cobalt carbide Wimet |
| DE19725914A1 (en) * | 1997-03-10 | 1998-09-17 | Widia Gmbh | Carbide or cermet sintered body and process for its production |
| US20040175284A1 (en) * | 2002-10-23 | 2004-09-09 | Mckay John Russell | Method of cryogenic treatment of tungsten carbide containing cobalt |
Non-Patent Citations (2)
| Title |
|---|
| 微波烧结WC-Co细晶硬质合金的工艺与性能. 周健，程吉平，袁润章，章韵瑾，邱进宇.中国有色金属学报，第9卷第3期. 1999 |
| 微波烧结WC-Co细晶硬质合金的工艺与性能. 周健，程吉平，袁润章，章韵瑾，邱进宇.中国有色金属学报，第9卷第3期. 1999 * |
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