CN103741001A - High-hardness and high-strength PY30T hard alloy and preparation method of high-hardness and high-strength PY30T hard alloy product - Google Patents
High-hardness and high-strength PY30T hard alloy and preparation method of high-hardness and high-strength PY30T hard alloy product Download PDFInfo
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Abstract
The invention relates to a high-hardness and high-strength PY30T hard alloy. The high-hardness and high-strength PY30T hard alloy comprises the following main components in percentage by weight: 83-87 percent of wolfram carbide (WC), 6-10 percent of cobalt, 0.4-0.6 percent of chromium carbide (Cr3C2), 0.2-0.4 percent of tantalum carbide (TaC), 0.91-0.99 percent of rare earth oxide and the balance of wolfram powder, wherein the grain size of the wolfram powder and the grain size of the WC do not exceed 0.6 micron. According to reduction and carbonization methods, fine WC powder is obtained, and then grain growth inhibitors such as the TaC, the Cr3C2 and the nano rare earth oxide are added, so that WC grains are prevented from being grown, enlarged and thickened during sintering, and the performance of the hard alloy is greatly improved. The density of the PY30T microcrystal hard alloy is 14.3-14.8g/cm<3>, the Rockwell hardness A (HRA) of the PY30T microcrystal hard alloy is 91.5-92.5, the bending strength of the PY30T microcrystal hard alloy is 2,600-2,800MPa, and the porosity of the PY30T microcrystal hard alloy is A02B00C00.
Description
Technical field:
The present invention relates to Hardmetal materials technical field, refer in particular to the preparation method of a kind of hard high-strength PY30T Wimet and alloy product thereof.
Background technology:
In recent years, along with the development of space flight and aviation industry, nuclear industry and electronic industry, various refractory alloy, titanium alloy and non-magnetic alloy material are widely used.Energy industry also needs to have the novel material of property.Yet existing cutting inserted tool hardness is low, wear resistance is low, can not process above-mentioned novel material.
Existing Wimet is mainly to take WC, TiC or the two to form composite carbide be hard phase, take Co as Binder Phase, a kind of alloy material forming by powder metallurgical technique high-temperature liquid-phase sintering.Wimet has that hardness is high, wear-resisting, intensity and a series of premium propertiess, particularly its high rigidity and wear resistance such as toughness is better, heat-resisting, corrosion-resistant, even also substantially remain unchanged at the temperature of 500 ℃, still has very high hardness in the time of 1000 ℃.
While manufacturing Wimet, select raw material powder particle size between 1～2 micron, and purity is very high.Raw material in accordance with regulations proportion of composing is prepared burden, and adds alcohol or the wet-milling in wet-type ball mill of other media, makes them fully mix, pulverize, and drying, adds the forming agent of classes such as wax or glue after sieving, then through super-dry, sieving makes compound.Mixture granulation, die mould, be heated to when approaching matrix metal fusing point (1300～1500 ℃), sclerosis just forms eutectic alloy with matrix metal.Through overcooling, sclerosis is distributed in the grid of matrix metal composition mutually, closely links together each other, forms a firmly integral body.The hardness of Wimet depends on sclerosis phase content and crystallite size, hardens that phase content is higher, crystal grain is thinner, and hardness is also larger.The toughness that junction temperature reduces Wimet determines by matrix metal, and matrix metal content is higher, and bending strength is larger.
The traditional preparation method of WC-Co Wimet generates WC by W powder and C powder in 1400～1600 solid state reactions, then with Co powder mixing and ball milling, coldmoulding, finally by liquid phase sintering densification.Generally at 1um～10um, there is the problems such as fragility is large, work softening in the alloy grain that this preparation method obtains.For example, though adjust some performance that WC/Co component can be improved final part, increase hardness increase wear resistance and solidity to corrosion that WC content can improve part; Increasing Co content can improve strength and toughness and improve processing characteristics.Yet be difficult to for a long time, when improving hardness, improve intensity and toughness always.
Wimet has become its development trend from traditional to ultra-fine, nano level conversion at present, and in the more than ten years in the past, in high-performance rigid alloy field, the research of ultra-fine cemented carbide and nano level hard alloy is a hot issue always.Yet undue preparation nanometer or the ultra-fine cemented carbide pursued, cost is increased sharply, the effect obtaining be not very obviously, and be difficult to control the grain growth in sintering process with this traditional technology production of powder metallurgy Wimet, cause the Wimet of acquisition small grains very difficult.
Summary of the invention:
The object of the invention is to overcome the deficiencies in the prior art part, the preparation method of a kind of hard high-strength PY30T Wimet and alloy product thereof is provided.
The technical scheme that the present invention realizes its object employing is: a kind of hard high-strength PY30T Wimet, in this Wimet, main component and weight percent content thereof are: wolfram varbide 83%-87%, cobalt 6%-10%, chromium carbide 0.4%-0.6%, tantalum carbide 0.2%-0.4%, rare earth oxide 0.91%-0.99% and surplus tungsten powder, wherein, described tungsten powder, wolfram varbide particle diameter are no more than 0.6 micron.
A production technique for hard high-strength PY30T hard metal article, this production technique comprises following steps:
A. by tungsten powder carbonization at low temperature, make tungsten carbide powder;
B. by quality proportioning wolfram varbide 83%-87%, cobalt 6%-10%, chromium carbide 0.4%-0.6%, tantalum carbide 0.2%-0.4%, rare earth oxide 0.91%-0.99%, surplus tungsten powder, be equipped with raw material;
C. the raw material being equipped with is dropped in ball mill and carries out wet-milling
D. wet-milling complete after drying and granulating, as required compression moulding Wimet work in-process;
E. work in-process are detected to rear dewaxing, pre-burning, then carry out vacuum sintering, make hard alloy finished product.
In described step c, the condition of wet-milling is: in totally-enclosed workshop, tilting wet wheeling machine, carry out, wet-milling liquid medium is raw spirit, in wet-milling, the mass ratio of mill ball and mixture is 3:1, in wet-milling, solid-liquid mass ratio is 20:1, the rotating speed of ball milling is 36r/min-40r/min, and Ball-milling Time is 96h.
In described step e, the processing condition of Wimet work in-process being carried out to pre-burning are: first heat 50min-70min and make it to be warming up to 340 ℃-360 ℃, be then incubated 50min-70min; Reheat 50min-70min and make temperature be warming up to 640 ℃-660 ℃ from 340 ℃-360 ℃, then be incubated 50min-70min; And then carry out vacuum sintering.
The processing condition of described vacuum sintering are: under vacuum condition, to the product heating 50min-70min after pre-burning, make its temperature rise to 1090 ℃-1110 ℃ from 640 ℃-660 ℃, be then incubated 50min-70min; Then rapid heating makes its temperature rise to 1190 ℃-1210 ℃ and be incubated 20min-40min; And then heating 50min-70min makes its temperature rise to 1450 ℃-1470 ℃, then be incubated 50min-70min; The last cooling hard metal article that obtains.
The present invention adopts reduction and carbonization method, first obtains thin WC powder, then adds TaC, Cr
3c
2with the grain growth inhibitor such as oxide nano rare earth, prevent that WC grain from growing up when sintering and become large chap, greatly promoted Cemented Carbide Properties.The performance of PY30T crystallite Wimet of the present invention is: density 14.3～14.8g/cm3, hardness HRA91.5～92.5, bending strength 2600～2800Mpa, porosity A02B00C00.
Accompanying drawing explanation:
Fig. 1 is process flow sheet of the present invention.
Embodiment:
Below in conjunction with specific embodiments and the drawings, the present invention is further described.
Embodiment 1
First by tungsten powder carbonization at low temperature, make tungsten carbide powder, screening particle diameter is no more than tungsten carbide powder and the tungsten powder of 0.6 micron;
Get tungsten carbide powder 83kg, cobalt 10kg, chromium carbide 0.4kg, tantalum carbide 0.2kg, rare earth oxide 0.91kg and tungsten powder 5.49kg;
The good raw material of above-mentioned outfit is dropped in ball mill and carries out wet-milling; The condition of wet-milling is: in totally-enclosed workshop, tilting wet wheeling machine, carry out, wet-milling liquid medium is raw spirit, and in wet-milling, the mass ratio of mill ball and mixture is 3:1, and in wet-milling, solid-liquid mass ratio is 20:1, the rotating speed of ball milling is 36r/min, and Ball-milling Time is 96h.
Drying and granulating after wet-milling completes, as required compression moulding Wimet work in-process; Work in-process are detected to rear dewaxing, pre-burning, then carry out vacuum sintering, make hard alloy finished product.The processing condition of carrying out pre-burning are: first heat 50min and make it to be warming up to 340 ℃, be then incubated 50min; Reheat 50min and make temperature be warming up to 640 ℃ from 340 ℃, then be incubated 50min; And then carry out vacuum sintering; The processing condition of vacuum sintering are: under vacuum condition, to the product heating 50min after pre-burning, make its temperature rise to 1090 ℃ from 640 ℃, be then incubated 50min; Then rapid heating makes its temperature rise to 1190 ℃ and be incubated 20min; And then heating 50min makes its temperature rise to 1450 ℃, then be incubated 50min; The last cooling hard metal article that obtains.
Embodiment 2
First by tungsten powder carbonization at low temperature, make tungsten carbide powder, screening particle diameter is no more than tungsten carbide powder and the tungsten powder of 0.6 micron;
Get tungsten carbide powder 87kg, cobalt 6kg, chromium carbide 0.6kg, tantalum carbide 0.4kg, rare earth oxide 0.99kg and tungsten powder 5.01kg;
The good raw material of above-mentioned outfit is dropped in ball mill and carries out wet-milling; The condition of wet-milling is: in totally-enclosed workshop, tilting wet wheeling machine, carry out, wet-milling liquid medium is raw spirit, and in wet-milling, the mass ratio of mill ball and mixture is 3:1, and in wet-milling, solid-liquid mass ratio is 20:1, the rotating speed of ball milling is 40r/min, and Ball-milling Time is 96h.
Drying and granulating after wet-milling completes, as required compression moulding Wimet work in-process; Work in-process are detected to rear dewaxing, pre-burning, then carry out vacuum sintering, make hard alloy finished product.The processing condition of carrying out pre-burning are: first heat 70min and make it to be warming up to 360 ℃, be then incubated 70min; Reheat 70min and make temperature be warming up to 660 ℃ from 360 ℃, then be incubated 70min; And then carry out vacuum sintering.
The processing condition of vacuum sintering are: under vacuum condition, to the product heating 70min after pre-burning, make its temperature rise to 1110 ℃ from 660 ℃, be then incubated 70min; Then rapid heating makes its temperature rise to 1210 ℃ and be incubated 40min; And then heating 70min makes its temperature rise to 1470 ℃, then be incubated 70min; The last cooling hard metal article that obtains.
Embodiment 3
First by tungsten powder carbonization at low temperature, make tungsten carbide powder, screening particle diameter is no more than tungsten carbide powder and the tungsten powder of 0.6 micron;
Get tungsten carbide powder 85kg, cobalt 8kg, chromium carbide 0.5kg, tantalum carbide 0.3kg, rare earth oxide 0.95kg and tungsten powder 5.25kg;
The good raw material of above-mentioned outfit is dropped in ball mill and carries out wet-milling; The condition of wet-milling is: in totally-enclosed workshop, tilting wet wheeling machine, carry out, wet-milling liquid medium is raw spirit, and in wet-milling, the mass ratio of mill ball and mixture is 3:1, and in wet-milling, solid-liquid mass ratio is 20:1, the rotating speed of ball milling is 38r/min, and Ball-milling Time is 96h.
Drying and granulating after wet-milling completes, as required compression moulding Wimet work in-process; Work in-process are detected to rear dewaxing, pre-burning, then carry out vacuum sintering, make hard alloy finished product.The processing condition of carrying out pre-burning are: first heat 60min and make it to be warming up to 350 ℃, be then incubated 60min; Reheat 60min and make temperature be warming up to 650 ℃ from 350 ℃, then be incubated 60min; And then carry out vacuum sintering; The processing condition of vacuum sintering are: under vacuum condition, to the product heating 60min after pre-burning, make its temperature rise to 1100 ℃ from 650 ℃, be then incubated 60min; Then rapid heating makes its temperature rise to 1100 ℃ and be incubated 30min; And then heating 60min makes its temperature rise to 1460 ℃, then be incubated 60min; The last cooling hard metal article that obtains.
The present invention adopts reduction and carbonization method, first obtains thin WC powder, then adds TaC, Cr
3c
2with the grain growth inhibitor such as oxide nano rare earth, prevent that WC grain from growing up when sintering and become large chap, greatly promoted Cemented Carbide Properties.The performance of PY30T crystallite Wimet of the present invention is: density 14.3～14.8g/cm3, hardness HRA91.5～92.5, bending strength 2600～2800Mpa, porosity A02B00C00.
Claims (5)
1. a hard high-strength PY30T Wimet, it is characterized in that: in this Wimet, main component and weight percent content thereof are: wolfram varbide 83%-87%, cobalt 6%-10%, chromium carbide 0.4%-0.6%, tantalum carbide 0.2%-0.4%, rare earth oxide 0.91%-0.99% and surplus tungsten powder, wherein, described tungsten powder, wolfram varbide particle diameter are no more than 0.6 micron.
2. a production technique for hard high-strength PY30T hard metal article, is characterized in that: this production technique comprises following steps:
A. by tungsten powder carbonization at low temperature, make tungsten carbide powder;
B. by quality proportioning wolfram varbide 83%-87%, cobalt 6%-10%, chromium carbide 0.4%-0.6%, tantalum carbide 0.2%-0.4%, rare earth oxide 0.91%-0.99%, surplus tungsten powder, be equipped with raw material;
C. the raw material being equipped with is dropped in ball mill and carries out wet-milling;
D. wet-milling complete after drying and granulating, as required compression moulding Wimet work in-process;
E. work in-process are detected to rear dewaxing, pre-burning, then carry out vacuum sintering, make hard alloy finished product.
3. the production technique of hard high-strength PY30T hard metal article according to claim 2, it is characterized in that: in described step c, the condition of wet-milling is: in totally-enclosed workshop, tilting wet wheeling machine, carry out, wet-milling liquid medium is raw spirit, in wet-milling, the mass ratio of mill ball and mixture is 3:1, in wet-milling, solid-liquid mass ratio is 20:1, the rotating speed of ball milling is 36r/min-40r/min, and Ball-milling Time is 96h.
4. the production technique of hard high-strength PY30T hard metal article according to claim 2, it is characterized in that: in described step e, the processing condition of Wimet work in-process being carried out to pre-burning are: first heat 50min-70min and make it to be warming up to 340 ℃-360 ℃, be then incubated 50min-70min; Reheat 50min-70min and make temperature be warming up to 640 ℃-660 ℃ from 340 ℃-360 ℃, then be incubated 50min-70min; And then carry out vacuum sintering.
5. according to the production technique of the hard high-strength PY30T hard metal article described in claim 2 or 4, it is characterized in that: the processing condition of described vacuum sintering are: under vacuum condition, to the product heating 50min-70min after pre-burning, make its temperature rise to 1090 ℃-1110 ℃ from 640 ℃-660 ℃, be then incubated 50min-70min; Then rapid heating makes its temperature rise to 1190 ℃-1210 ℃ and be incubated 20min-40min; And then heating 50min-70min makes its temperature rise to 1450 ℃-1470 ℃, then be incubated 50min-70min; The last cooling hard metal article that obtains.
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| CN104998966A (en) * | 2015-05-18 | 2015-10-28 | 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 |
| CN105057672A (en) * | 2015-07-27 | 2015-11-18 | 常州西利合金工具有限公司 | Machining method for cemented carbide tool |
| CN106399797A (en) * | 2016-10-28 | 2017-02-15 | 四川科力特硬质合金股份有限公司 | Cobalt-bonded titanium carbide based wear-resisting corrosion-resistant hard alloy and preparation method thereof |
| CN107263737A (en) * | 2017-05-22 | 2017-10-20 | 宁波妙力斯五金工具有限公司 | A kind of sintered carbide circular saw |
| CN107287460A (en) * | 2017-05-27 | 2017-10-24 | 徐平芳 | A kind of preparation method of hard alloy |
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| CN109365823A (en) * | 2018-10-25 | 2019-02-22 | 上海材料研究所 | A kind of whole hard alloy hobboing cutter and its manufacturing process |
| CN109468515A (en) * | 2018-12-11 | 2019-03-15 | 嘉禾福顺机械实业有限公司 | A kind of high hardness alloy and preparation method thereof for pump |
| CN115505776A (en) * | 2022-09-22 | 2022-12-23 | 长沙华信合金机电有限公司 | Hard alloy material for manufacturing engineering cutting pick and preparation method thereof |
| CN116083767A (en) * | 2022-11-01 | 2023-05-09 | 厦门通耐钨钢有限公司 | Tungsten carbide-based hard alloy and preparation method thereof |
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| CN104998966A (en) * | 2015-05-18 | 2015-10-28 | 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 |
| 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 |
| CN105057672A (en) * | 2015-07-27 | 2015-11-18 | 常州西利合金工具有限公司 | Machining method for cemented carbide tool |
| CN106399797A (en) * | 2016-10-28 | 2017-02-15 | 四川科力特硬质合金股份有限公司 | Cobalt-bonded titanium carbide based wear-resisting corrosion-resistant hard alloy and preparation method thereof |
| CN106399797B (en) * | 2016-10-28 | 2017-12-01 | 四川科力特硬质合金股份有限公司 | One kind is with cobalt binder titanium carbide base wear-resisting and corrosion-resisting hard-alloy and preparation method |
| CN107263737A (en) * | 2017-05-22 | 2017-10-20 | 宁波妙力斯五金工具有限公司 | A kind of sintered carbide circular saw |
| CN107287460A (en) * | 2017-05-27 | 2017-10-24 | 徐平芳 | A kind of preparation method of hard alloy |
| CN108315623A (en) * | 2018-04-18 | 2018-07-24 | 吉林大学 | A kind of diamond composite and preparation method thereof of addition oxide nano rare earth |
| CN109365823A (en) * | 2018-10-25 | 2019-02-22 | 上海材料研究所 | A kind of whole hard alloy hobboing cutter and its manufacturing process |
| CN109468515A (en) * | 2018-12-11 | 2019-03-15 | 嘉禾福顺机械实业有限公司 | A kind of high hardness alloy and preparation method thereof for pump |
| CN115505776A (en) * | 2022-09-22 | 2022-12-23 | 长沙华信合金机电有限公司 | Hard alloy material for manufacturing engineering cutting pick and preparation method thereof |
| CN116083767A (en) * | 2022-11-01 | 2023-05-09 | 厦门通耐钨钢有限公司 | Tungsten carbide-based hard alloy and preparation method thereof |
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Application publication date: 20140423 |