CN101338382B - Method for preparing high strength cemented carbide - Google Patents
Method for preparing high strength cemented carbide Download PDFInfo
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- CN101338382B CN101338382B CN200710035293A CN200710035293A CN101338382B CN 101338382 B CN101338382 B CN 101338382B CN 200710035293 A CN200710035293 A CN 200710035293A CN 200710035293 A CN200710035293 A CN 200710035293A CN 101338382 B CN101338382 B CN 101338382B
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Abstract
The invention relates to a preparation method for a hard alloy with high intensity which includes: during re-wetmilling, adding the liquid paraffin with the temperature of 60 to 80 DEG C as a shapingagent; adding the liquid paraffin with a purity of 99.5 percent with a liquid-solid ratio of 10 to 30ml/Kg. The hot water with the temperature of 55 to 80 DEG C is pumped into the jacket of a wetmilling machine; a heat preservation barrel is also used for transferring the slurry of materials. In the invention, as the paraffin is used as the shaping agent and a special method is adopted to add theshaping agent, acetone is added as a wetmilling medium; compared with other mediums, the method of the invention not only is economic, but also has a good effect; the thick and thin tungsten carbide with two different average granularities are adopted to prepare the hard alloy with a bimodal structure; the thick particles ensure the toughness of the alloy; the thin particles then can improve the wear-resistance of the alloy; a working procedure of pre-pressing is increased to improve the pelletization performance thereof; a low-pressure sintering technique is adopted; different atmospheres andpressures in a furnace are adopted according to the different steps of the sintering process, thus ensuring the intensity of a product.
Description
Technical field
The invention belongs to the Wimet technical field, be particularly related to a kind of preparation method of high strength cemented carbide, can arrive the requirement of hard alloy spherical-teeth, hard alloy complex sheet with the product of this method production, to satisfy the specific demand of down-the-hold drill bit, tooth-wheel bit, the first-class instrument of diamond drill machine, and improve the quality of products, reduce the products production cost.
Background technology
The quality of Wimet hardness has very big relation with the forming agent that select to adopt, and the grinding medium that most CEMENTED CARBIDE PRODUCTION producer is selected is alcohol, hexane, but owing to contain moisture content in the alcohol, makes dirtyization of product easily; The hexane purchase cost is too high, and is volatile in addition, is difficult to reclaim.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, and provide a kind of preparation method of high strength cemented carbide, can arrive the requirement of hard alloy spherical-teeth, hard alloy complex sheet with the product of this method production, to satisfy the specific demand of down-the-hold drill bit, tooth-wheel bit, the first-class instrument of diamond drill machine, and improve the quality of products, reduce the products production cost.
Technical scheme of the present invention is: a kind of preparation method of high strength cemented carbide, comprise batching, wet-milling, add-on type agent wet-milling again, drying, fragmentation, precompressed, cross processing steps such as 40 mesh sieves, granulation, compression moulding, sintering dewaxing, passivation, when add-on type agent rewetting is ground, the whiteruss that adds 60～80 ℃ is as forming agent, do not produce segregation and mixes to guarantee paraffin.
Be that 99.5% whiteruss adds with liquid-solid ratio 10-30ml/Kg with purity.
Feed 55～80 ℃ hot water in the wet wheeling machine chuck.
Slip shifts and adopts insulated tank.
During batching, the weight content of metal cobalt powder is 6～16% in the material component, and all the other are two kinds of varigrained wolfram varbides, and the batching requirement of two kinds of different grain size wolfram varbides is: thick wolfram varbide mean particle size is 4～7 μ m, and thin wolfram varbide mean particle size is 1～1.5 μ m; The weight content of two kinds of different grain size wolfram varbides is: the ratio of thick, thin wolfram varbide is 0.55～3.6: 1.
Broken back by preformer with the material precompressed, to improve the pellet performance of material.
The present invention compared with prior art has following characteristics:
Below in conjunction with embodiment detailed structure of the present invention is further described.
Embodiment
A kind of preparation method of high strength cemented carbide comprises batching, wet-milling, add-on type agent wet-milling again, drying, fragmentation, precompressed, crosses processing steps such as 40 mesh sieves, granulation, compression moulding, sintering dewaxing, passivation; During batching, the weight content of metal cobalt powder is 6～16% in the material component, and all the other are two kinds of varigrained wolfram varbides, and the batching requirement of two kinds of different grain size wolfram varbides is: thick wolfram varbide mean particle size is 4～7 μ m, and thin wolfram varbide mean particle size is 1～1.5 μ m; The weight content of two kinds of different grain size wolfram varbides is: the ratio of thick, thin wolfram varbide is 0.55～3.6: 1; During wet-milling, ratio of grinding media to material is 3.25～3.5: 1, adds acetone as grinding medium by solid-to-liquid ratio 3～3.5: 1, milling time 20～28 hours, drum's speed of rotation 25～29r/min; In rewetting when mill,, the whiteruss that adds 60～80 ℃ is as forming agent, is that 99.5% whiteruss adds with liquid-solid ratio 10-30ml/Kg with purity; Feed 55～80 ℃ hot water in the wet wheeling machine chuck, slip shift to adopt special insulated tank, guarantees that paraffin does not produce segregation and mixes; When broken, adopt the blade pulverizer of high speed rotating, exsiccant thing powder is further broken; Broken back by preformer with the material precompressed, to improve the pellet performance of material; Adopt low pressure sintering stove sintering after the precompressed, adopt different furnace atmosphere and pressure according to the different times in the sintering process, thereby the density and the intensity of product have been guaranteed, 300～400 ℃ of dewaxing temperatures, 4～6 hours dewaxing time, sintering temperature≤1430 ℃. the Wimet by the two peak structure of method for preparing of the present invention has high strength and high rigidity, can satisfy the requirement of hard alloy spherical-teeth, hard alloy complex sheet.
Table 1 provides hardness and the bending strength synopsis for preparing Wimet by six kinds of specific embodiments of the product Wimet of the present invention of preceding method preparation and every kind of embodiment.
Table 2 provides with the whether precompressed and adopt the impact of performance synopsis of the product Wimet of the present invention of different pressures precompressed preparation of a kind of powder of the trade mark.
Subordinate list 1: the hardness of Wimet and bending strength synopsis
Subordinate list 2: the impact of performance synopsis of Wimet
The present invention adopts paraffin to make forming agent and special methods adds forming agent, adds acetone and makes wet grinding media, compares both economy with other media, and effect is good again; The Wimet of the two peak structure of thick, the thin wolfram varbide preparation of two kinds of different mean particle sizes of employing, coarse particles keeps the toughness of alloy, and fine particle then can improve its wear resistance; Increase prepressing procedures, improve its pellet performance; Adopt low pressure sintering technology,, guaranteed the density and the intensity of product according to the different furnace atmosphere and the pressure of different steps employing of sintering process.
Claims (1)
1. the preparation method of a high strength cemented carbide, it comprises batching, wet-milling, add-on type agent wet-milling again, drying, fragmentation, precompressed, crosses 40 mesh sieves, granulation, compression moulding, sintering dewaxing, passivation technology step; When rewetting was ground, the whiteruss that adds 60～80 ℃ was as forming agent, was that 99.5% whiteruss adds with liquid-solid ratio 10-30mL/Kg with purity; During batching, the weight content of metal cobalt powder is 6～16% in the material component, and all the other are two kinds of varigrained wolfram varbides, and the batching requirement of two kinds of different grain size wolfram varbides is: thick wolfram varbide mean particle size is 4～7 μ m, and thin wolfram varbide mean particle size is 1～1.5 μ m; The weight content of two kinds of different grain size wolfram varbides is: the ratio of thick, thin wolfram varbide is 0.55～3.6: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710035293A CN101338382B (en) | 2007-07-06 | 2007-07-06 | Method for preparing high strength cemented carbide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710035293A CN101338382B (en) | 2007-07-06 | 2007-07-06 | Method for preparing high strength cemented carbide |
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| Publication Number | Publication Date |
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| CN101338382A CN101338382A (en) | 2009-01-07 |
| CN101338382B true CN101338382B (en) | 2010-05-12 |
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| CN200710035293A Expired - Fee Related CN101338382B (en) | 2007-07-06 | 2007-07-06 | Method for preparing high strength cemented carbide |
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921924B (en) * | 2010-09-06 | 2011-11-09 | 株洲肯特硬质合金有限公司 | Method for doping paraffin forming agent in cemented carbide mixture |
| CN102717061A (en) * | 2011-03-29 | 2012-10-10 | 厦门钨业股份有限公司 | A paraffin base compound forming agent for a water base cemented carbide mixture |
| CN102303114B (en) * | 2011-05-30 | 2013-06-26 | 深圳市格林美高新技术股份有限公司 | Cladding cobalt powder and preparation method thereof |
| 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 |
| CN102994792B (en) * | 2012-12-10 | 2016-08-03 | 湖南世纪钨材股份有限公司 | A kind of high intensity, the preparation method of high hardness nanocomposite crystalline substance tungsten-cobalt hard alloy |
| CN102990069B (en) * | 2012-12-10 | 2016-04-20 | 湖南世纪钨材股份有限公司 | A kind of preparation method utilizing useless tungsten-cobalt alloy to make coarse-grain carbide alloy pick |
| CN104032153B (en) * | 2014-06-06 | 2016-09-07 | 河源正信硬质合金有限公司 | A kind of manufacture method of high tough crystallite hard alloy |
| CN104451221B (en) * | 2014-12-15 | 2016-07-27 | 技锋精密刀具（马鞍山）有限公司 | A kind of preparation method of hard alloy cutting tool material |
| CN104741615A (en) * | 2015-04-08 | 2015-07-01 | 华北电力大学（保定） | Super-fine grain twin-peak copper preparing method |
| CN104998966B (en) * | 2015-05-18 | 2017-03-22 | 株洲固纳特硬质合金有限公司 | Forming and manufacturing method for red stamping die type hard alloy die base body |
| CN105970062B (en) * | 2016-05-18 | 2018-01-16 | 湖南世纪钨材股份有限公司 | Erosion resistant hard alloy and preparation method thereof |
| EP3577242B1 (en) * | 2017-01-31 | 2022-10-12 | Tallinn University of Technology | Method of making a double-structured bimodal tungsten cemented carbide composite material |
| CN107034407B (en) * | 2017-05-27 | 2018-07-13 | 遵义中铂硬质合金有限责任公司 | A kind of production method of hard alloy |
| CN109249030A (en) * | 2018-09-06 | 2019-01-22 | 晋城鸿刃科技有限公司 | The preparation method of tungsten-cobalt series hard alloy |
| CN109112338B (en) * | 2018-10-17 | 2020-10-30 | 四川铭泰顺硬质合金有限公司 | Preparation method of hard alloy body |
| CN111218576B (en) * | 2020-02-25 | 2022-01-18 | 自贡硬质合金有限责任公司 | Preparation method of heterogeneous alloy |
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| CN1487110A (en) * | 2003-09-04 | 2004-04-07 | 株洲硬质合金集团有限公司 | Prepn of hard W-Co alloy |
| CN1554789A (en) * | 2003-12-29 | 2004-12-15 | 株洲硬质合金集团有限公司 | Process for preparing tungsten-cobalt hard alloy |
| CN1686644A (en) * | 2005-05-10 | 2005-10-26 | 自贡硬质合金有限责任公司 | Production method of tungsten carbide base ball shaped thermal spray coating powder |
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- 2007-07-06 CN CN200710035293A patent/CN101338382B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1487110A (en) * | 2003-09-04 | 2004-04-07 | 株洲硬质合金集团有限公司 | Prepn of hard W-Co alloy |
| CN1554789A (en) * | 2003-12-29 | 2004-12-15 | 株洲硬质合金集团有限公司 | Process for preparing tungsten-cobalt hard alloy |
| CN1686644A (en) * | 2005-05-10 | 2005-10-26 | 自贡硬质合金有限责任公司 | Production method of tungsten carbide base ball shaped thermal spray coating powder |
Non-Patent Citations (1)
| Title |
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| JP昭61-194148A 1986.08.28 |
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| CN101338382A (en) | 2009-01-07 |
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