CN103789594A - Method for preparing AlCr2C material based on induction furnace melting - Google Patents
Method for preparing AlCr2C material based on induction furnace melting Download PDFInfo
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- CN103789594A CN103789594A CN201410052692.4A CN201410052692A CN103789594A CN 103789594 A CN103789594 A CN 103789594A CN 201410052692 A CN201410052692 A CN 201410052692A CN 103789594 A CN103789594 A CN 103789594A
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- induction furnace
- powder
- graphite powder
- chromium powder
- alcr
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Abstract
The invention discloses a method for preparing an AlCr2C material based on induction furnace melting. According to the technical scheme, the method comprises the following steps: vacuumizing an induction furnace with an aluminum ingot to be 7*10<-2>Pa or below, and filling argon gas in the induction furnace until the pressure of the argon gas is an atmospheric pressure; melting the aluminum ingot in the induction furnace, continuing to heat to 800-1700 DEG C, adding chromium powder, melting the chromium powder, adding graphite powder, preserving heat for 2-30 minutes, finally cooling to 600-1000 DEG C, casting and cooling to prepare the AlCr2C material. The preparation process is conducted under the condition that the pressure of the argon gas is the atmospheric pressure; the chromium powder and the graphite powder are added according to a molar ratio of the aluminum ingot to the chromium powder to the graphite powder of 1 to 2 to 1; the preparation process is simple; and the prepared AlCr2C material is stable in chemical components, uniform in microscopic structures, good in hydration resistance, stable in high-temperature performance, excellent in corrosion resistance and good in thermal shock resistance.
Description
Technical field
The invention belongs to AlCr
2c material technology field.Be specifically related to one and prepare AlCr based on induction furnace melting
2the method of C material.
Background technology
AlCr
2c, Al
4c
3one group of material that fusing point is very high in carbide.The fusing point (or distillation) of a lot of carbide is all very high, and the oxidation-resistance of carbide is poor, generally starts oxidation at red heat temperature, but most resistance of oxidation is stronger than dystectic metal, more better than graphite and carbon.Most of carbide have good conduction and thermal conductivity, and simultaneously a lot of carbide have very high hardness, thereby carbide has a wide range of applications in industry manufacture.Such as be used as antioxidant in the preparation of carbon containing refractory.
The raw material of manufacturing carbide articles is all synthetic, and the synthetic method of carbide raw material has three kinds:
(1) the direct chemical combination of metal and carbon dust, temperature of reaction because of thing different, about 1200 ~ 2200 ℃;
(2) metal and carbonaceous gas at high temperature interact;
(3) metal oxide and carbon effect, also claim carbon reduction method, by synthetic the frit reaction in electric arc furnace of the mixture of metal oxide and carbon or in vacuum, hydrogen, rare gas element or other reducing atmosphere, under lower than metal oxide melting temperature, also carry out with it solid state reaction synthesizing carbide by carbon reducing metal oxide.
The technical scheme that the preparation method of conventional carbide adopts is: first starting material are mixed to (being dry mixed or wet mixing); then moulding (machine press or etc. static pressure or casting); finally at high temperature burn till, burn till and need protection of reducing atmosphere or argon shield, the method for the employing hot pressed sintering also having.
Though above-mentioned synthetic method respectively has its advantage, the shortcoming existing is to prepare that the method more complicated of carbide, facility investment are large and expense is higher.Meanwhile, owing to inevitably producing size segregation in mixing process, make the microstructure of the material of preparing even not, affected thus the stability of materials chemistry composition and character.Moreover aluminium carbonaceous material is as Al
4c
3the aquation very easily although high temperature properties is excellent, the volume effect that aquation is brought has caused the damage of material.
Summary of the invention
The present invention is intended to overcome prior art defect, and object is to provide the simple AlCr of a kind of technique
2the preparation method of C material, prepared AlCr
2c material has that chemical constitution is stable, uniform microstructure, hydration resistance are good, have stable high-temperature performance, erosion-resisting characteristics excellence and the good feature of thermal shock resistance, is suitable for preparing pyroceramic and refractory materials.
For achieving the above object, the technical solution used in the present invention is: first the induction furnace that aluminium ingot is housed is evacuated to 7 × 10
-2pa or 7 × 10
-2below Pa, then inject argon gas to normal atmosphere in induction furnace; Then melt the aluminium ingot in induction furnace, follow-up continuing of aluminium ingot fusing is warming up to 800 ~ 1700 ℃, then adds chromium powder, after chromium powder fusing, adds Graphite Powder 99, is incubated 2 ~ 30 minutes, is finally cooled to 600 ~ 1000 ℃, casts cooling, makes AlCr
2c material.
In technique scheme: preparation process is that the ar pressure in induction furnace is to carry out under an atmospheric pressure, described ar pressure is that a normal atmosphere is to realize by influx and the discharge of argon gas in adjusting induction furnace; The add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 add by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
Al content >=the 99wt% of described aluminium ingot.
The granularity of described chromium powder is 5 ~ 100 μ m, the Cr content >=99wt% of chromium powder.
The granularity of described Graphite Powder 99 is 5 ~ 100 μ m, the C content >=99wt% of Graphite Powder 99.
Owing to adopting technique scheme, in the present invention under raw materials used alternating electromagnetism field action in induction furnace, thereby make raw material inner produce eddy current reach heating or the effect of melting, under the stirring action of this alternating magnetic field, composition and the temperature of induction furnace Raw are more even, can fully contact and form the AlCr of chemical constitution and uniform microstructure
2c material, AlCr
2the production efficiency of C material also more existing preparation method improves greatly, can obtain tissue and uniform microstructure and stable material after cooling.
The method of the relatively existing high pressure-temperature synthesizing carbide of the present invention, preparation technology is simple, prepared AlCr
2c material has that chemical constitution is stable, uniform microstructure, hydration resistance are good, have stable high-temperature performance, erosion-resisting characteristics excellence and the good feature of thermal shock resistance, wherein, and AlCr
2c material is under the environment of 70 ℃ and humidity 90%, and test in 100 hours finds not have hydration phenomena.Be suitable for preparing pyroceramic and refractory materials.
Therefore, preparation technology of the present invention is simple, prepared AlCr
2c material has that chemical constitution is stable, uniform microstructure, hydration resistance are good, have stable high-temperature performance, erosion-resisting characteristics excellence and thermal shock resistance good.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, not the restriction to its protection domain.
For avoiding repetition, now technical parameter unification related this embodiment is described below, in embodiment, repeat no more:
Al content >=the 99wt% of described aluminium ingot;
The granularity of described chromium powder is 5 ~ 100 μ m, the Cr content >=99wt% of chromium powder;
The granularity of described Graphite Powder 99 is 5 ~ 100 μ m, the C content >=99wt% of Graphite Powder 99.
Preparation process is that the ar pressure in induction furnace is to carry out under an atmospheric pressure, and described ar pressure is that a normal atmosphere is to realize by influx and the discharge of argon gas in adjusting induction furnace.
embodiment 1
One is prepared AlCr based on induction furnace melting
2the method of C material.First the induction furnace that aluminium ingot is housed is evacuated to 7 × 10
-2pa or 7 × 10
-2below Pa, then inject argon gas to normal atmosphere in induction furnace; Then melt the aluminium ingot in induction furnace, follow-up continuing of aluminium ingot fusing is warming up to 800 ~ 1000 ℃, then adds chromium powder, after chromium powder fusing, adds Graphite Powder 99, is incubated 2 ~ 10 minutes, is finally cooled to 600 ~ 700 ℃, casts cooling, makes AlCr
2c material.
Wherein: the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 add by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
embodiment 2
One is prepared AlCr based on induction furnace melting
2the method of C material.First the induction furnace that aluminium ingot is housed is evacuated to 7 × 10
-2pa or 7 × 10
-2below Pa, then inject argon gas to normal atmosphere in induction furnace; Then melt the aluminium ingot in induction furnace, follow-up continuing of aluminium ingot fusing is warming up to 1000 ~ 1200 ℃, then adds chromium powder, after chromium powder fusing, adds Graphite Powder 99, is incubated 10 ~ 15 minutes, is finally cooled to 700 ~ 800 ℃, casts cooling, makes AlCr
2c material.
Wherein: the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 add by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
embodiment 3
One is prepared AlCr based on induction furnace melting
2the method of C material.First the induction furnace that aluminium ingot is housed is evacuated to 7 × 10
-2pa or 7 × 10
-2below Pa, then inject argon gas to normal atmosphere in induction furnace; Then melt the aluminium ingot in induction furnace, follow-up continuing of aluminium ingot fusing is warming up to 1200 ~ 1400 ℃, then adds chromium powder, after chromium powder fusing, adds Graphite Powder 99, is incubated 15 ~ 20 minutes, is finally cooled to 800 ~ 900 ℃, casts cooling, makes AlCr
2c material.
Wherein: the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 add by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
embodiment 4
One is prepared AlCr based on induction furnace melting
2the method of C material.First the induction furnace that aluminium ingot is housed is evacuated to 7 × 10
-2pa or 7 × 10
-2below Pa, then inject argon gas to normal atmosphere in induction furnace; Then melt the aluminium ingot in induction furnace, follow-up continuing of aluminium ingot fusing is warming up to 1400 ~ 1500 ℃, then adds chromium powder, after chromium powder fusing, adds Graphite Powder 99, is incubated 20 ~ 25 minutes, is finally cooled to 900 ~ 1000 ℃, casts cooling, makes AlCr
2c material.
Wherein: the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 add by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
embodiment 5
One is prepared AlCr based on induction furnace melting
2the method of C material.First the induction furnace that aluminium ingot is housed is evacuated to 7 × 10
-2pa or 7 × 10
-2below Pa, then inject argon gas to normal atmosphere in induction furnace; Then melt the aluminium ingot in induction furnace, follow-up continuing of aluminium ingot fusing is warming up to 1500 ~ 1700 ℃, then adds chromium powder, after chromium powder fusing, adds Graphite Powder 99, is incubated 25 ~ 30 minutes, is finally cooled to 900 ~ 1000 ℃, casts cooling, makes AlCr
2c material.
Wherein: the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 add by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
In this embodiment under raw materials used alternating electromagnetism field action in induction furnace, thereby make raw material inner produce eddy current reach heating or the effect of melting, under the stirring action of this alternating magnetic field, composition and the temperature of induction furnace Raw are more even, can fully contact and form the AlCr of chemical constitution and uniform microstructure
2c material, AlCr
2the production efficiency of C material also more existing preparation method improves greatly, can obtain tissue and uniform microstructure and stable material after cooling.
The method of the relatively existing high pressure-temperature synthesizing carbide of this embodiment, preparation technology is simple, prepared AlCr
2c material has that chemical constitution is stable, uniform microstructure, hydration resistance are good, have stable high-temperature performance, erosion-resisting characteristics excellence and the good feature of thermal shock resistance, wherein, and AlCr
2c material is under the environment of 70 ℃ and humidity 90%, and test in 100 hours finds not have hydration phenomena.Be suitable for preparing pyroceramic and refractory materials.
Therefore, the preparation technology of this embodiment is simple, prepared AlCr
2c material has that chemical constitution is stable, uniform microstructure, hydration resistance are good, have stable high-temperature performance, erosion-resisting characteristics excellence and thermal shock resistance good.
Claims (4)
1. prepare AlCr based on induction furnace melting for one kind
2the method of C material, is characterized in that: first the induction furnace that aluminium ingot is housed is evacuated to 7 × 10
-2pa or 7 × 10
-2below Pa, then inject argon gas to normal atmosphere in induction furnace; Then melt the aluminium ingot in induction furnace, follow-up continuing of aluminium ingot fusing is warming up to 800 ~ 1700 ℃, then adds chromium powder, after chromium powder fusing, adds Graphite Powder 99, is incubated 2 ~ 30 minutes, is finally cooled to 600 ~ 1000 ℃, casts cooling, makes AlCr
2c material;
In technique scheme: preparation process is that the ar pressure in induction furnace is to carry out under an atmospheric pressure; The add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 add by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
2. prepare AlCr based on induction furnace melting according to claim 1
2the method of C material, is characterized in that the Al content>=99wt% of described aluminium ingot.
3. prepare AlCr based on induction furnace melting according to claim 1
2the method of C material, the granularity that it is characterized in that described chromium powder is 5 ~ 100 μ m, the Cr content>=99wt% of chromium powder.
4. prepare AlCr based on induction furnace melting according to claim 1
2the method of C material, the granularity that it is characterized in that described Graphite Powder 99 is 5 ~ 100 μ m, the C content>=99wt% of Graphite Powder 99.
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|---|---|---|---|
| CN201410052692.4A CN103789594B (en) | 2014-02-17 | 2014-02-17 | One prepares AlCr based on induction furnace melting 2the method of C material |
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| CN103789594A true CN103789594A (en) | 2014-05-14 |
| CN103789594B CN103789594B (en) | 2015-09-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104192905A (en) * | 2014-08-04 | 2014-12-10 | 西华大学 | Salt bath furnace and method for continuously synthesizing Cr2AlC powder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1743480A (en) * | 2005-09-29 | 2006-03-08 | 中国科学院上海硅酸盐研究所 | A kind of preparation method of aluminium-carbon-dichromium block material |
| CN101265104A (en) * | 2008-04-25 | 2008-09-17 | 北京交通大学 | Constant pressure synthesis method for aluminum chromium carbide ceramic powder |
| CN103101911A (en) * | 2013-03-04 | 2013-05-15 | 武汉科技大学 | AlCr2C powder and preparation method thereof |
-
2014
- 2014-02-17 CN CN201410052692.4A patent/CN103789594B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1743480A (en) * | 2005-09-29 | 2006-03-08 | 中国科学院上海硅酸盐研究所 | A kind of preparation method of aluminium-carbon-dichromium block material |
| CN101265104A (en) * | 2008-04-25 | 2008-09-17 | 北京交通大学 | Constant pressure synthesis method for aluminum chromium carbide ceramic powder |
| CN103101911A (en) * | 2013-03-04 | 2013-05-15 | 武汉科技大学 | AlCr2C powder and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| LI-OU XIAO 等: "Synthesis and thermal stability of Cr2A1C", 《JOURNAL OF THE EUROPEAN CERAMIC SOCIETY》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104192905A (en) * | 2014-08-04 | 2014-12-10 | 西华大学 | Salt bath furnace and method for continuously synthesizing Cr2AlC powder |
| CN104192905B (en) * | 2014-08-04 | 2015-08-12 | 西华大学 | Continuous synthesis Cr 2the salt bath furnace of AlC powder and synthetic method |
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| Publication number | Publication date |
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| CN103789594B (en) | 2015-09-16 |
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