CN101338383A - Method for preparing high-density cemented carbide - Google Patents
Method for preparing high-density cemented carbide Download PDFInfo
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- CN101338383A CN101338383A CNA2007100352941A CN200710035294A CN101338383A CN 101338383 A CN101338383 A CN 101338383A CN A2007100352941 A CNA2007100352941 A CN A2007100352941A CN 200710035294 A CN200710035294 A CN 200710035294A CN 101338383 A CN101338383 A CN 101338383A
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Abstract
The invention relates to a preparation method for a hard alloy with high intensity which includes the technical steps of batching, wetmilling, adding a shaping agent and re-wetmilling, drying, cracking, pre-pressing, passing through a screen of 40 meshes, pelletizing, pressing and shaping, sintering and dewaxing, passivating, etc. After cracking, a pre-pressing machine is used to pre-press the materials so as to improve the pelletization performance of the materials; the pressure value of pre-pressing is 8.5 to 15MPa; a pre-pressing time is 30 to 120 seconds; the batching demands for the tungsten carbide with two different granularities include: the average granularity of the thick tungsten carbide is 4 to 7Mum; the average granularity of the thin tungsten carbide is 1 to 1.5Mum. The hard alloy with a bimodal structure prepared by the method of the invention has high intensity and rigidness; the rigidness is 91HBA; the anti-bending intensity is 3100MPa; the demands for the spherical gear and the compound sheet of the hard alloy can be met; compared with the spherical gear and the compound sheet of the hard alloy prepared by the prior art, the service life and the effect are greatly improved. Besides, the use efficiency of a product is improved and the production cost of the product is reduced.
Description
Technical field
The invention belongs to the Wimet technical field, be particularly related to a kind of preparation method of high-density 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 size of Wimet density has very big relation with the grinding medium of different pressing modes and selection and the forming agent of employing.The preparation method of existing Wimet comprises batching, wet-milling, add-on type agent wet-milling again, drying, crosses processing steps such as 40 mesh sieves, granulation, compression moulding, sintering dewaxing, passivation, there are not these two processing steps of dried fragmentation and precompressed, cause the pellet performance of product poor, can't guarantee the density of product, the product of producing is difficult to arrive the requirement of hard alloy spherical-teeth, hard alloy complex sheet, can not satisfy the specific demand of down-the-hold drill bit, tooth-wheel bit, the first-class instrument of diamond drill machine.
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-density 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-density cemented carbide, and it comprises batching, wet-milling, add-on type agent wet-milling again, drying, crosses processing steps such as 40 mesh sieves, granulation, compression moulding, sintering dewaxing, passivation; Broken back by preformer with the material precompressed.
The force value of precompressed is 8.5～15Mpa, and squeeze time is 30～120 seconds.
Behind drying step, increase broken and two processing steps of precompressed; 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.
In rewetting when mill, add 60～80 ℃ whiteruss as forming agent, is that 99.5% whiteruss adds with liquid-solid ratio 10-30ml/Kg with purity.
Adopt the blade pulverizer of high speed rotating that exsiccant thing powder is further broken when broken.
Add acetone during wet-milling as grinding medium.
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-density 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; With the material precompressed, to improve the pellet performance of material, the force value of precompressed is 8.5～15Mpa by preformer in broken back, and squeeze time is 30～120 seconds; Adopt low pressure sintering stove sintering after the precompressed, adopt different furnace atmosphere and pressure, thereby guaranteed the density and the intensity of product, 300～400 ℃ of dewaxing temperatures, 4～6 hours dewaxing time, sintering temperature≤1430 ℃ according to the different times in the sintering process.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.
Subordinate list 1: the hardness of Wimet and bending strength synopsis
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 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 (6)
1, a kind of preparation method of high-density cemented carbide, it comprises batching, wet-milling, add-on type agent wet-milling again, drying, crosses processing steps such as 40 mesh sieves, granulation, compression moulding, sintering dewaxing, passivation; It is characterized in that broken back by preformer with the material precompressed.
2, preparation method according to claim 1, the force value that it is characterized in that precompressed is 8.5～15Mpa, squeeze time is 30～120 seconds.
3, preparation method according to claim 2 is characterized in that behind drying step, increases broken and two processing steps of precompressed; 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.
4, according to claim 2 or 3 described preparation methods, it is characterized in that rewetting when mill add 60～80 ℃ whiteruss as forming agent, be that 99.5% whiteruss adds with liquid-solid ratio 10-30ml/Kg with purity.
5,, adopt the blade pulverizer of high speed rotating that exsiccant thing powder is further broken when it is characterized in that fragmentation according to claim 2 or 3 described preparation methods.
6,, add acetone when it is characterized in that wet-milling as grinding medium according to claim 2 or 3 described preparation methods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100352941A CN101338383A (en) | 2007-07-06 | 2007-07-06 | Method for preparing high-density cemented carbide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100352941A CN101338383A (en) | 2007-07-06 | 2007-07-06 | Method for preparing high-density cemented carbide |
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| CN101338383A true CN101338383A (en) | 2009-01-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857937B (en) * | 2009-04-08 | 2012-06-20 | 西峡县鑫龙保温材料有限公司 | Ferro-silico-aluminum high-pressure alloying pellet and processing technique thereof |
| CN102652999A (en) * | 2011-03-02 | 2012-09-05 | 深圳市常兴金刚石磨具有限公司 | Process for machining super-hard product by using pre-alloy powder |
| CN104032153A (en) * | 2014-06-06 | 2014-09-10 | 河源正信硬质合金有限公司 | Production method of high-toughness microcrystal hard alloys |
| CN106756160A (en) * | 2016-11-10 | 2017-05-31 | 无锡市明盛强力风机有限公司 | A kind of preparation method of cermet material |
| CN107557639A (en) * | 2017-09-27 | 2018-01-09 | 武汉新锐合金工具有限公司 | A kind of three-phase structure hard alloy and preparation method thereof |
-
2007
- 2007-07-06 CN CNA2007100352941A patent/CN101338383A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857937B (en) * | 2009-04-08 | 2012-06-20 | 西峡县鑫龙保温材料有限公司 | Ferro-silico-aluminum high-pressure alloying pellet and processing technique thereof |
| CN102652999A (en) * | 2011-03-02 | 2012-09-05 | 深圳市常兴金刚石磨具有限公司 | Process for machining super-hard product by using pre-alloy powder |
| CN104032153A (en) * | 2014-06-06 | 2014-09-10 | 河源正信硬质合金有限公司 | Production method of high-toughness microcrystal hard alloys |
| 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 |
| CN106756160A (en) * | 2016-11-10 | 2017-05-31 | 无锡市明盛强力风机有限公司 | A kind of preparation method of cermet material |
| CN107557639A (en) * | 2017-09-27 | 2018-01-09 | 武汉新锐合金工具有限公司 | A kind of three-phase structure hard alloy and preparation method thereof |
| CN107557639B (en) * | 2017-09-27 | 2019-03-08 | 武汉新锐合金工具有限公司 | A kind of three-phase structure hard alloy and preparation method thereof |
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Open date: 20090107 |