CN102701206A - Manufacturing method of ultra coarse-grain tungsten carbide powder - Google Patents
Manufacturing method of ultra coarse-grain tungsten carbide powder Download PDFInfo
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- CN102701206A CN102701206A CN2011100760345A CN201110076034A CN102701206A CN 102701206 A CN102701206 A CN 102701206A CN 2011100760345 A CN2011100760345 A CN 2011100760345A CN 201110076034 A CN201110076034 A CN 201110076034A CN 102701206 A CN102701206 A CN 102701206A
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- tungsten carbide
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Abstract
The invention discloses a manufacturing method of ultra coarse-grain tungsten carbide powder, which comprises the following steps: stirring and mixing ultra coarse-grain tungsten powder in a carbon addition device for carbon addition; delivering a tungsten-carbon mixture with added carbon into a carbonization device, performing superhigh-temperature carbonization at above 2200 DEG C by intermediate frequency induction heating. The production method can improve the original grain size of tungsten carbide powder. The produced tungsten carbide powder has an original grain size of more than 5.5 microns, and has improved crystal development.
Description
Technical field
The present invention relates to a kind of ultra macrocrystalline tungsten carbide powder method of manufacture.
Background technology
The working method of tradition macrocrystalline tungsten carbide powder is with adding Li
+Or add Na
+The thick tungsten powder of reductive carries out rolling ball grinding-in carbon in common joining in the carbon device, the long-time carbonization of high temperature (1800 ℃～2000 ℃) is carried out in the energising heating in common carbon pipe then.There is following obvious defects in this method:
(1) with adding Li
+Or add Na
+Method is the thick tungsten powder of original production also, and there is open defect in its crystalline structure, has a large amount of pseudomorphic crystal structures, and tungsten powder original grain degree is little, the crystal development imperfection, and lattice defect is many, is prone to fragmentation, and contains a large amount of Li
+, Na
+Deng the detrimental impurity element, the quality defect of the hereditary original tungsten powder of macrocrystalline tungsten carbide powder meeting that such tungsten powder of usefulness is produced;
(2) traditional carbon method of joining is a rolling ball grinding-in carbon, and equipment manufacturing cost is high, efficient is low, energy consumption is high; And can cause the rising of detrimental impurity content such as iron, quality product causes harm.
(3) carbonization temperature is no more than 2000 ℃, and carbonization time is grown (about 100 minutes/boat), output is little, energy consumption is high, and the crystal grain of tungsten carbide powder is generally less than 4.0 μ m.With the alloy that such tungsten carbide powder is produced, its grain fineness number generally can only be difficult to greater than 6 μ m between 3 μ m～5 μ m.Can't satisfy the requirement of ultra coarse-grain or extraordinarily thick cemented carbide production and application.
Summary of the invention
The object of the present invention is to provide a kind of ultra macrocrystalline tungsten carbide powder method of manufacture, make crystal development perfect, and improve tungsten carbide powder original grain degree.
To achieve these goals, technical scheme of the present invention is following:
A kind of ultra macrocrystalline tungsten carbide powder method of manufacture will surpass the coarse-grain tungsten powder earlier and in joining the carbon device, mix to stir and join carbon; Tungsten-carbon the compound that will prepare carbon is again delivered in the carbonizing apparatus, adopts Frequency Induction Heating, carries out ultrahigh-temperature carbonization more than 2200 ℃.
Said structure of joining the carbon device adopts Chinese utility model: the patent No. is 03253385.3 " a kind of stirrer that is used to prepare tungsten carbide powder ".
After adopting such scheme, the present invention compared with prior art has the following advantages:
(1) the carbon device of joining that adopts is that carbon equipment is joined in a kind of stirring, and this device structure is simple, cost is low, production efficiency is high, efficient energy-saving;
(2) tungsten powder of employing high temperature reduction need not to add Li+ or Na+.Therefore, tungsten powder purity is high, and detrimental impurity content is few, and major part is the monocrystalline tungsten powder, and the original grain degree is thick, and crystal development is perfect, and defective is few;
(3) adopt intermediate frequency ultrahigh-temperature carbonization technique, Frequency Induction Heating can produce ultrahigh-temperature more than 2200 ℃, and carbonization temperature is high, and heating uniformity is good, the thermo-efficiency height, and efficient energy-saving helps the carrying out and the crystalline growth and perfect of carburizing reagent;
(4) the tungsten carbide powder original grain degree produced of this method surpasses 5.5 μ m; Shortcoming such as overcome that the original grain degree that exists in traditional macrocrystalline tungsten carbide powder is less than normal, crystal development imperfection, lattice defect are many; Improve the quality of coarse-grain class tungsten carbide powder product, satisfied the production and the application of coarse-grain and ultra coarse-grain series hard alloy.
Below in conjunction with embodiment the present invention is described further.
Embodiment
Preferred embodiment of the present invention.
To surpass the coarse-grain tungsten powder earlier and in joining the carbon device, mix to stir and join carbon, joining the carbon device is that the patent No. is 03253385.3 " a kind of stirrer that is used to prepare tungsten carbide powder "; Tungsten-carbon the compound that will prepare carbon is again delivered in the carbonizing apparatus, adopts Frequency Induction Heating, carries out ultrahigh-temperature carbonization more than 2200 ℃.
Below be the tungsten carbide powder raw material of different grain fineness numbers, the grain fineness number of the ultra macrocrystalline tungsten carbide powder that comes out through traditional technology and explained hereafter of the present invention relatively.
Visible by tabulation, technology of the present invention makes crystal development perfect, and the tungsten carbide powder grain fineness number improves greatly, surpasses 5.5 μ m.
Claims (1)
1. ultra macrocrystalline tungsten carbide powder method of manufacture is characterized in that: will surpass the coarse-grain tungsten powder earlier and in joining the carbon device, mix to stir and join carbon; Tungsten-carbon the compound that will prepare carbon is again delivered in the carbonizing apparatus, adopts Frequency Induction Heating, carries out ultrahigh-temperature carbonization more than 2200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100760345A CN102701206A (en) | 2011-03-28 | 2011-03-28 | Manufacturing method of ultra coarse-grain tungsten carbide powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100760345A CN102701206A (en) | 2011-03-28 | 2011-03-28 | Manufacturing method of ultra coarse-grain tungsten carbide powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102701206A true CN102701206A (en) | 2012-10-03 |
Family
ID=46894346
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100760345A Pending CN102701206A (en) | 2011-03-28 | 2011-03-28 | Manufacturing method of ultra coarse-grain tungsten carbide powder |
Country Status (1)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3642219A1 (en) * | 1986-12-10 | 1988-06-23 | Devender Dr Dhingra | Process for preparing coarse-grained tungsten carbide |
| US5061661A (en) * | 1989-04-26 | 1991-10-29 | Gte Products Corporation | Method for producing tungsten carbide and cemented tungsten carbide article therefrom having a uniform microstructure |
| US5071473A (en) * | 1989-02-10 | 1991-12-10 | Gte Products Corporation | Uniform coarse tungsten carbide powder and cemented tungsten carbide article and process for producing same |
| US5096689A (en) * | 1989-01-23 | 1992-03-17 | Kennametal Inc. | Process for producing tungsten monocarbide |
| CN2647419Y (en) * | 2003-09-10 | 2004-10-13 | 厦门金鹭特种合金有限公司 | Stirring machine for producing tungsten carbide powder |
| CN101664809A (en) * | 2009-10-09 | 2010-03-10 | 株洲硬质合金集团有限公司 | Uniform macromeritic tungsten powder and method for preparing tungsten carbide powder |
-
2011
- 2011-03-28 CN CN2011100760345A patent/CN102701206A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3642219A1 (en) * | 1986-12-10 | 1988-06-23 | Devender Dr Dhingra | Process for preparing coarse-grained tungsten carbide |
| US5096689A (en) * | 1989-01-23 | 1992-03-17 | Kennametal Inc. | Process for producing tungsten monocarbide |
| US5071473A (en) * | 1989-02-10 | 1991-12-10 | Gte Products Corporation | Uniform coarse tungsten carbide powder and cemented tungsten carbide article and process for producing same |
| US5061661A (en) * | 1989-04-26 | 1991-10-29 | Gte Products Corporation | Method for producing tungsten carbide and cemented tungsten carbide article therefrom having a uniform microstructure |
| CN2647419Y (en) * | 2003-09-10 | 2004-10-13 | 厦门金鹭特种合金有限公司 | Stirring machine for producing tungsten carbide powder |
| CN101664809A (en) * | 2009-10-09 | 2010-03-10 | 株洲硬质合金集团有限公司 | Uniform macromeritic tungsten powder and method for preparing tungsten carbide powder |
Non-Patent Citations (1)
| Title |
|---|
| 张玉华等: "中频碳化钨粉末特性及其对合金性能影响的研究", 《硬质合金》, 31 December 2006 (2006-12-31) * |
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Application publication date: 20121003 |