CN1271004C - Sintering process of superfine pure WC without adhering phase - Google Patents
Sintering process of superfine pure WC without adhering phase Download PDFInfo
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- CN1271004C CN1271004C CNB2004100680228A CN200410068022A CN1271004C CN 1271004 C CN1271004 C CN 1271004C CN B2004100680228 A CNB2004100680228 A CN B2004100680228A CN 200410068022 A CN200410068022 A CN 200410068022A CN 1271004 C CN1271004 C CN 1271004C
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Abstract
The present invention relates to a sintering method of ultra-fine pure WC without binding phase, which is applied to the application areas of powder metallurgy and hard materials. In the method, ultra-fine pure WC powder without binding phase preserved by vacuum or inert gas is used as a raw material, and the raw material powder is compacted by a high-strength graphite mold in an electrode and then put between upper and lower electrodes of an SPS spark plasma sintering device together with the mold to be vacuumized; when the vacuum degree reaches more than 5Pa, the powder is electrified for temperature rise and pressurized within the bearing limit range of the graphite mold; when reaching the sintering temperature, the temperature is preserved, and after power cut and cooling, the sample material is taken out, wherein the electrification is carried out when the vacuum degree reaches more than 5Pa, the temperature is increased at the speed of 180 DEG C /min, the sintering temperature is from 1400 to 1600 DEG C, and the heat preservation time is from 0 to 8 minutes. The present invention adopts the SPS technology to directly sinter the ultra-fine pure WC material without binding phase so as to overcome the defects of the existing hard materials, and has the advantages of simple technology, low cost, short production periodicity and acquirement of hard materials with superior performance.
Description
Technical field
The present invention relates to a kind of sintering method of wolfram varbide, specifically is a kind of sintering method of superfine pure WC without adhering phase.Be used for powder metallurgy and and mechanically resistant material Application Areas.
Background technology
Wolfram varbide (WC) is the most frequently used mechanically resistant material.Because the fusing point of WC is produced utilization in the mode of sintered hard alloys such as WC-Co usually up to 3048K, Co etc. play cohesive action.The interpolation of bonding phases such as Co has not only reduced the hardness of material, and erosion resistance and scale resistance make that also production process is complicated, and owing to causes thermal stresses easily with the difference of the thermal expansivity of WC.In addition, when processing steel part usually, smear metal is bonded at easily influences cutter on the cutter the result of use that exists of phase Co because low melting point bonds, and tiny grain-size helps improving the performance of mechanically resistant material.The normal sintering mode needs Partial Liquid Phase, and some WC grain are dissolved in liquid phase, separates out on other crystal grain then, and the latter is grown up.The particle of original WC powder is thin more, and solubleness and the dissolution rate of WC in liquid phase is big more, and growing up during sintering is serious more, and the normal sintering mode treatment time is long, is difficult to obtain ultra-fine mechanically resistant material.In recent years the SPS discharge plasma sintering technique of Chu Xianing (hereinafter to be referred as the SPS technology) is added to press-powder body test portion by the ON-OFF DC-pulse impression that the particular power source control device is taken place, except the caused sintering promoter action of common electrodischarge machining(E.D.M.) (discharge impact pressure and Jiao Er heating), also effectively utilize the caused sintering promoter action of spark discharge phenomenon (moment produces high-temperature plasma) that produces between impulsive discharge initial stage powder.
Find by prior art documents, " Microstructures of binderlesstungsten carbides sintered by spark plasma sintering process " (Seng I.Cha etc. that people such as Seung I.Cha deliver on " Materials Science andEngineering A " 356 (2003) 381-389, " utilize SPS technology agglomerating not have the microstructure of bonding phase wolfram varbide ", Materials Science and Engineering A, 2003 356 volume 381-389 pages or leaves) literary composition, this article utilizes the SPS technology for the pure WC sintering, by reducing sintering temperature (below 1700 ℃) and shortening sintering time, having suppressed crystal grain grows up unusually, but the starting powder particle diameter is thin more, sintered density is low more, the material hole that the WC particle diameter is thin is more, and the WC median size does not reach the degree of ultra-fine (500nm is following).
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of sintering method of superfine pure WC without adhering phase is provided, make it adopt SPS technology direct sintering superfine pure WC without adhering phase material, thereby overcome the shortcoming of existing mechanically resistant material, it is simple to form a kind of technology, with low cost, with short production cycle, the preparation method of the mechanically resistant material of superior performance.
The present invention is achieved by the following technical solutions, the present invention is starting material with the ultra-fine pure WC powder of the nothing bonding phase that process vacuum or rare gas element are preserved, with the starting material powder after electrode is with compacting in the high strength graphite mould, place together with mould between the upper/lower electrode of SPS discharge plasma sintering device, extracting vacuum makes vacuum tightness reach 5Pa above back energising and pressurizes with the speed intensification of average about 180 ℃/min and bearing in the limit range of graphite jig, insulation is 0-8 minute after reaching sintering temperature 1400-1600 ℃, and test portion is taken out in outage cooling back.
Pressuring method can have several: a kind of is and the synchronous different pressure that heats up that promptly with the Kai Shi Noboru pressure simultaneously that heats up, pressure reaches capacity when reaching sintering temperature; Another kind is to remain same pressure; Also can segmentation pressurize, i.e. the heating initial stage is used lower constant pressure, is forced into the limit and maintenance always when shrinking beginning rapidly.
Through observing, analyze and test, the present invention obtained the high-density that the primary particle particle diameter keeps substantially (relative density: 97-100%), high rigidity (2000-2700Hv and 93-96.5HRA) and high-fracture toughness (8-15MPam
1/2) the ultra-fine pure WC bulk material of high-performance.
The present invention utilizes Archimedes's law of buoyancy to measure density.The condition determination of Vickers' hardness is load 20Kg, loads 15 seconds time length.Adopt pressing in method to calculate the fracture toughness property of material.Starting material of the present invention can adopt the pure WC powder of various particle diameters, just particle diameter not simultaneously the performance of optimum sintering condition and gained material to some extent difference (particle diameter spy more is that the performance of mechanically resistant material is good more, but difficult more densification sintering), median size 200nm is the thinnest pure WC (powder) material that can access at present.Even the WC-Co commonly used of bonding phase is arranged, also is difficult to obtain the ultra-fine bulk material that median size reaches the 200nm degree with the normal sintering technology.
Key of the present invention is effective utilization of discharge plasma sintering technique, it has the characteristics such as spark discharge between high speed sintering, surface cleaning effect and powder, the shortcoming that can not effectively suppress the grain growth in the sintering process when high speed sintering has overcome normal sintering, effect of electric field makes the sensitization (surface cleaning) easily of powder particle surface, and " spark discharge between powder " make and can concentrate high energy pulse (high-temperature plasma) in needs intergranular bonded part, is successfully that sintering does not have the deciding factor of the pure WC of high melting point of low melting point bonding phase.
Embodiment
Provide following examples in conjunction with content of the present invention:
Embodiment 1:
With the about 30g of ultra-fine pure WC powder of the about 200nm of median size in the graphite jig of internal diameter 20mm after the compacting, place together with mould between the upper/lower electrode of SPS device, energising heats up and the segmentation pressurization with the speed of about 160 ℃/min after the extracting vacuum, reached after 1400 ℃ of the sintering temperatures insulation 4 minutes, sample is taken out in outage cooling back.The result of scanning electron microscopic observation shows that WC particle diameter and the starting powder particle diameter behind the sintering is consistent.After measured, the relative density of this sample is 97.1%, and hardness is about 2050Hv and 94.1HRA, and fracture toughness property is about 15MPam
1/2
Embodiment 2:
With the about 13g of ultra-fine pure WC powder of the about 200nm of median size in the graphite jig of internal diameter 15mm after the compacting, place together with mould between the upper/lower electrode of SPS device, energising heats up and the segmentation pressurization with the speed of about 150 ℃/min after the extracting vacuum, reached after 1450 ℃ of the sintering temperatures insulation 8 minutes, sample is taken out in outage cooling back.After measured, the relative density of this sample is 98%, and hardness is about 2700Hv and 95HRA, and fracture toughness property is about 9MPam
1/2
Embodiment 3:
With the about 35g of ultra-fine pure WC powder of the about 200nm of median size in the graphite jig of internal diameter 20mm after the compacting, place together with mould between the upper/lower electrode of SPS device, energising heats up and the segmentation pressurization with the speed of about 180 ℃/min after the extracting vacuum, reached after 1430 ℃ of the sintering temperatures insulation 4 minutes, sample is taken out in outage cooling back.The result of X-ray diffraction test shows that this sample still is made of mutually single WC.The result of scanning electron microscopic observation shows WC particle diameter and the starting powder particle diameter basically identical behind the sintering.After measured, the relative density of this sample is 98.1%, and hardness is about 2600Hv and 96.1HRA, and fracture toughness property is about 11MPam
1/2
Embodiment 4:
With the about 11g of ultra-fine pure WC powder of the about 200nm of median size in the graphite jig of internal diameter 15mm after the compacting, the SPS device of packing into, energising heats up and the segmentation pressurization with the speed of about 150 ℃/min after the extracting vacuum, reaches after 1500 ℃ of the sintering temperatures insulation 4 minutes.The result of X-ray diffraction test shows that this sample still is made of mutually single WC.The result of scanning electron microscopic observation shows that the WC particle diameter ratio starting powder particle diameter of this sample grows up to some extent, but not clearly.After measured, the relative density of this sample is 99.6%, and hardness is about 2550Hv, and fracture toughness property is about 10MPam
1/2
Embodiment 5:
With the about 13g of ultra-fine pure WC powder of the about 200nm of median size in the graphite jig of internal diameter 15mm after the compacting, the SPS device of packing into, energising heats up and the segmentation pressurization with the speed of about 150 ℃/min after the extracting vacuum, reaches after 1600 ℃ of the sintering temperatures insulation 0 minute.The result of X-ray diffraction test shows that this sample still is made of mutually single WC.After measured, the density of this sample is 15.6g/cm
3(relative density reaches 100%), hardness is about 2600Hv, and fracture toughness property is about 10.5MPam
1/2
Claims (1)
1, a kind of sintering method of superfine pure WC without adhering phase, it is characterized in that, ultra-fine pure WC powder with the nothing bonding phase of preserving through vacuum or rare gas element is starting material, with the starting material powder after electrode is with compacting in the high strength graphite mould, place together with mould between the upper/lower electrode of SPS discharge plasma sintering device, extracting vacuum makes vacuum tightness reach 5Pa above back energising and heats up and pressurize bearing in the limit range of graphite jig, be incubated after reaching sintering temperature, test portion is taken out in outage cooling back, described vacuum tightness reaches the speed intensification of 5Pa above back energising with average 180 ℃/min, sintering temperature is 1400-1600 ℃, soaking time 0-8 minute.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100680228A CN1271004C (en) | 2004-11-11 | 2004-11-11 | Sintering process of superfine pure WC without adhering phase |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100680228A CN1271004C (en) | 2004-11-11 | 2004-11-11 | Sintering process of superfine pure WC without adhering phase |
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| CN1609053A CN1609053A (en) | 2005-04-27 |
| CN1271004C true CN1271004C (en) | 2006-08-23 |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9056799B2 (en) * | 2010-11-24 | 2015-06-16 | Kennametal Inc. | Matrix powder system and composite materials and articles made therefrom |
| CN102925728B (en) * | 2011-08-12 | 2014-11-19 | 中国科学院上海硅酸盐研究所 | Preparation method of binderless nanometer tungsten carbide cemented carbide |
| CN103567440A (en) * | 2013-08-15 | 2014-02-12 | 厦门虹鹭钨钼工业有限公司 | Preparation method for tungsten carbide target material for film coating of oil exploration drill bit |
| CN104232967B (en) * | 2014-10-10 | 2017-01-18 | 台州学院 | Method for preparing low binder phase wolfram carbide hard alloy |
| CN105088044B (en) * | 2015-09-30 | 2017-04-05 | 株洲水箭硬质合金有限责任公司 | A kind of preparation method of the mutually superhard level hard metal article of nanometer of soap-free emulsion polymeization |
| CN107522490A (en) * | 2016-06-20 | 2017-12-29 | 张家港市华舰五金工具有限公司 | The preparation method of tungsten carbide ceramics material |
| CN106116582B (en) * | 2016-06-27 | 2017-06-16 | 上海海事大学 | A kind of sintering method without cobalt tungsten carbide |
| CN106810260B (en) * | 2017-01-13 | 2020-04-24 | 台州学院 | Preparation method of tungsten carbide-based non-binding phase hard alloy |
| CN107620049B (en) * | 2017-09-01 | 2019-11-05 | 北京安泰六九新材料科技有限公司 | A kind of preparation method of soap-free emulsion polymeization phase pure WC target |
| CN108033790A (en) * | 2017-12-21 | 2018-05-15 | 洛阳名力科技开发有限公司 | A kind of preparation method of non-bond cemented carbide |
| CN108145302A (en) * | 2017-12-22 | 2018-06-12 | 合肥工业大学 | A kind of SPS diffusion welding methods of WC hard alloy of the same race |
| CN108276001A (en) * | 2018-01-09 | 2018-07-13 | 中国海洋石油集团有限公司 | A kind of super abrasive Talide discharge plasma sintering method |
| CN108165859B (en) * | 2018-01-22 | 2019-08-30 | 合肥工业大学 | A kind of SPS sintering method of large scale soap-free emulsion polymeization phase pure WC hard alloy |
| CN109692955A (en) * | 2019-03-04 | 2019-04-30 | 郑州大学 | A kind of pure WC hard alloy preparation method and pure WC hard alloy |
| CN112250442B (en) * | 2020-09-30 | 2021-08-24 | 北京科技大学 | Preparation method of high-toughness binderless nanocrystalline hard alloy |
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