CN1086753A - Use the fluid bed reduction and carbonization one-step preparing hard alloy compound powder - Google Patents
Use the fluid bed reduction and carbonization one-step preparing hard alloy compound powder Download PDFInfo
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- CN1086753A CN1086753A CN 93108446 CN93108446A CN1086753A CN 1086753 A CN1086753 A CN 1086753A CN 93108446 CN93108446 CN 93108446 CN 93108446 A CN93108446 A CN 93108446A CN 1086753 A CN1086753 A CN 1086753A
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Abstract
In fluidized-bed, once prepare the ultra-fine cemented carbide composite powder with hydrogen reduction, carbonaceous gas carbonization.Prepare the raw material composite powder with chemical process, can satisfy of the requirement of arbitrary trade mark composition.The raw material composite powder is inserted in the fluidized-bed, make the fluidisation operating air with rare gas element or hydrogen, carry out hydrogen reduction, add carbonaceous gas during carbonization and under 750～1500 ℃ temperature, carry out carbonization 1-10 hours, can obtain superfine ultra-fine cemented carbide composite powder, and its granularity can be by the technology adjustment.The composite powder narrow particle size distribution of this prepared, productive rate height, technology are simple, practical, are a kind of new technologies that has the preparation ultra-fine cemented carbide composite powder of promotional value.
Description
The invention belongs to what cemented carbide powder preparation technology.
The application of Wimet is more extensive, yet makes the precise materials that satisfies the modern industry needs, and the raw material and the process for producing that adapt with it must be arranged.The ultra-fine cemented carbide composite powder is exactly the necessary material that obtains high strength, ultrafine gain size.
At present, must prepare ultra-fine W powder in order to prepare ultra-fine cemented carbide, ultrafine WC powder, ultra-fine Co powder or superfine WC-Co composite powder.Usually adopting mechanical crushing method is carbonization-fragmentation-ball milling etc., and this method limitation is difficult to obtain ultrafine powder in batches more greatly.Such as big, be easy to generate oxidation, burning even blast with carbonization ultrafine tungsten powder technology activity of ultra-fine W powder in its preparation process.In order to solve the problem of above-mentioned existence, will make process complications by increase equipment, thereby also increase the cost of making.For this reason, the purpose of this invention is to provide a kind of in fluidized-bed the hydrogen reduction carbonization once prepare the ultra-fine cemented carbide composite powder.
Fluidized-bed is widely used in that the reaction of chemical industry is synthetic, in catalysis, cracking and the drying.Being characterized in that reactant has increased under fluidized state is in contact with one another and acts on, and speed of response is accelerated, and shortens the reaction times, and the reaction in the fixed bed mainly to be immobilized undertaken by diffusion.Thereby speed of response is slow, the time is long.The reduction and the carbonization of general cemented carbide powder mainly are to belong to the fixed bed type, and the particle behind the raw material reduction and carbonization is easy to pile up, grow up because of remaining static, and unfavorable what obtains thin powder.Then different in fluidized-bed, raw material powder is in the state that stirs that does not stop, and not only the particle after the reduction is not easy to build up and grows up, and mutual collision also has refining effect to a certain degree, the ultimate principle of Here it is fluidized-bed prepares superfine WC-Co composite powder.
Advantage of the present invention is produced at what reduction and carbonization in fluidized-bed and is contained Co amount and be the ultra-fine cemented carbide composite powder of 3-25%, fine size, narrowly distributing, simple for process, cost of investment is low, raise labour productivity greatly, environmentally safe is a kind of ultra-fine composite powder novel process of production of efficient energy-saving.
The present invention is achieved in that
The fluidizer of selecting Rational structure for use carries out hydrogen reduction and adds the carbonaceous gas carbonization containing " compound of W, Co element is made the raw material composite powder through chemical method " in fluidized-bed, can obtain superfine WC-Co composite powder, and its main technique flow process is seen accompanying drawing 1.
Below technical process is illustrated:
1, preparation raw material: proportion of raw materials should be decided on the Wimet composition of being done.The selection of raw material should be based on the element compounds such as W, Co that are easy to obtain.
2, chemical mixing: the chemical mixing method mainly adopts sol-gel, co-precipitation and spraying drying.
3, hydrogen reduction carbonization (fluidized-bed): after the raw material composite powder entered fluidized-bed, hydrogen reduction and carbonization were successive processes.With rare gas element such as Ar, He, Ne, Kr, Xe and N
2Deng, or hydrogen makes the raw material composite powder reach fluidization in fluidized-bed as operating air, and, add carbonaceous gas carbonization 1-10h under 750-1500 ℃ temperature at 450-850 ℃ of hydrogen reducing, produce the ultra-fine cemented carbide composite powder.
Embodiment 1:
Take by weighing ammonium tungstate, Xiao Suangu and ammonium Bicarbonate Food Grade by the composition of YG12 and add water, be made into homogeneous solution, being spray dried to mean particle size is the raw material composite powder of 10 μ m.Be added in the fluidized-bed, use hydrogen reduction, add carbonaceous gas 1200 ℃ of carbonizations 1 hour at 450-850 ℃.The mean particle size of gained powder is 0.1 μ, and even particle size distribution, and scope is narrow.Other index all meets the requirement of Wimet.
Claims (4)
1, once prepares the ultra-fine cemented carbide composite powder with fluid bed reduction and carbonization, it is characterized in that the raw material composite powder with the chemical method preparation is placed fluidized-bed, make the fluidisation operating air with rare gas element or hydrogen and carry out hydrogen reduction, add the carbonaceous gas carbonization and obtain the ultra-fine cemented carbide composite powder.
2, according to claim 1, once prepare the ultra-fine cemented carbide powder with fluid bed reduction and carbonization, it is characterized in that chemical method is to use sol-gel method, coprecipitation method and spray-drying process.
3, according to claim 1, once prepare the ultra-fine cemented carbide powder with fluid bed reduction and carbonization, it is characterized in that the fluidisation operating air is H
2Or rare gas element, as Ar, He, Ne, Kr, Xe and N
2
4, according to claim 1, once prepare the ultra-fine cemented carbide powder with fluid bed reduction and carbonization, it is characterized in that adding carbonaceous gas carbonization 1-10h under 750-1500 ℃ temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93108446 CN1031492C (en) | 1993-07-20 | 1993-07-20 | One-step preparing hard alloy compound powder by fluid bed reduction and carbonization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93108446 CN1031492C (en) | 1993-07-20 | 1993-07-20 | One-step preparing hard alloy compound powder by fluid bed reduction and carbonization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1086753A true CN1086753A (en) | 1994-05-18 |
| CN1031492C CN1031492C (en) | 1996-04-10 |
Family
ID=4987150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93108446 Expired - Fee Related CN1031492C (en) | 1993-07-20 | 1993-07-20 | One-step preparing hard alloy compound powder by fluid bed reduction and carbonization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031492C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1091665C (en) * | 1999-08-13 | 2002-10-02 | 武汉工业大学 | Industrilized process for preparing nm-class non-eta-phase compound powder of tungsten carbide and cobalt |
| CN100443221C (en) * | 2006-03-22 | 2008-12-17 | 成都汉基投资有限公司 | Process for preparing MC-N type nano hard alloy powder |
| CN106734786A (en) * | 2016-12-30 | 2017-05-31 | 西南铝业（集团）有限责任公司 | A kind of method of high-magnesium aluminum alloy ring rolling |
-
1993
- 1993-07-20 CN CN 93108446 patent/CN1031492C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1091665C (en) * | 1999-08-13 | 2002-10-02 | 武汉工业大学 | Industrilized process for preparing nm-class non-eta-phase compound powder of tungsten carbide and cobalt |
| CN100443221C (en) * | 2006-03-22 | 2008-12-17 | 成都汉基投资有限公司 | Process for preparing MC-N type nano hard alloy powder |
| CN106734786A (en) * | 2016-12-30 | 2017-05-31 | 西南铝业（集团）有限责任公司 | A kind of method of high-magnesium aluminum alloy ring rolling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1031492C (en) | 1996-04-10 |
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