CN103789594B - One prepares AlCr based on induction furnace melting 2the method of C material - Google Patents
One prepares AlCr based on induction furnace melting 2the method of C material Download PDFInfo
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- CN103789594B CN103789594B CN201410052692.4A CN201410052692A CN103789594B CN 103789594 B CN103789594 B CN 103789594B CN 201410052692 A CN201410052692 A CN 201410052692A CN 103789594 B CN103789594 B CN 103789594B
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- graphite powder
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Abstract
One prepares AlCr based on induction furnace melting
2the method of C material.Its technical scheme is: first the induction furnace that aluminium ingot is housed is evacuated to 7 × 10
-2pa or 7 × 10
-2below Pa, then in induction furnace, inject argon gas to normal atmosphere; Then melt the aluminium ingot in induction furnace, aluminium ingot fusing follow-up continuing is warming up to 800 ~ 1700 DEG C, then adds chromium powder, adds Graphite Powder 99, be incubated 2 ~ 30 minutes, be finally cooled to 600 ~ 1000 DEG C after chromium powder fusing, casting cooling, obtained AlCr
2c material.Preparation process is the ar pressure in induction furnace is carry out under an atmospheric pressure, and wherein, the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 adds by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.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 is excellent and thermal shock resistance is good.
Description
Technical field
The invention belongs to AlCr
2c field of material technology.Be specifically related to one and prepare AlCr based on induction furnace melting
2the method of C material.
Background technology
AlCr
2c, Al
4c
3the material that one group of fusing point is very high in carbide.The fusing point of a lot of carbide (or distillation) is all very high, and the oxidation-resistance of carbide is poor, generally namely start oxidation at red heat temperature, but the resistance of oxidation of majority is stronger than dystectic metal, than graphite and carbon better.Most of carbide has good conduction and thermal conductivity, and a lot of carbide has very high hardness simultaneously, and thus carbide has a wide range of applications in industry manufacture.Such as in the preparation of carbon containing refractory, be used as antioxidant.
The raw material manufacturing carbide articles is all synthetic, and the synthetic method of carbide raw material has three kinds:
(1) metal and the direct chemical combination of carbon dust, temperature of reaction is different because of thing, about 1200 ~ 2200 DEG C;
(2) metal and carbonaceous gas at high temperature interact;
(3) metal oxide and carbon effect, also carbon reduction method is claimed, mixture frit reaction in electric arc furnace of metal oxide and carbon to be synthesized or in vacuum, hydrogen, rare gas element or other reducing atmosphere, lower than under metal oxide melting temperature, also carry out solid state reaction kinetics carbide with it by carbon reducing metal oxide.
The technical scheme that the preparation method of conventional carbide adopts is: first by starting material mixing (being dry mixed or wet mixing); then shaping (machine pressure or isostatic pressed 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 had.
Though above-mentioned synthetic method respectively has its advantage, the shortcoming existed be prepare that the Measures compare of carbide is complicated, facility investment greatly and costly.Meanwhile, owing to inevitably producing size segregation in mixing process, make the microstructure of the material prepared even not, have impact on the stability of materials chemistry composition and character thus.Moreover aluminium carbonaceous material is as Al
4c
3although the excellent but very easily aquation of high temperature properties, the volume effect that aquation is brought result in 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
2the feature that C material has that chemical constitution is stablized, uniform microstructure, hydration resistance are good, has stable high-temperature performance, erosion-resisting characteristics is excellent and thermal shock resistance is good, 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 in induction furnace, inject argon gas to normal atmosphere; Then melt the aluminium ingot in induction furnace, aluminium ingot fusing follow-up continuing is warming up to 800 ~ 1700 DEG C, then adds chromium powder, adds Graphite Powder 99, be incubated 2 ~ 30 minutes, be finally cooled to 600 ~ 1000 DEG C after chromium powder fusing, casting cooling, obtained AlCr
2c material.
In technique scheme: preparation process is the ar pressure in induction furnace is carry out under an atmospheric pressure, to be a normal atmosphere be described ar pressure is realized by the influx and discharge regulating argon gas in induction furnace; The add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 adds 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 μm, the Cr content >=99wt% of chromium powder.
The granularity of described Graphite Powder 99 is 5 ~ 100 μm, 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, make raw material inside produce eddy current thus reach heating or melt effect, under the stirring action of this alternating magnetic field, the composition of induction furnace Raw and temperature are all comparatively even, fully can 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
2the feature that C material has that chemical constitution is stablized, uniform microstructure, hydration resistance are good, has stable high-temperature performance, erosion-resisting characteristics is excellent and thermal shock resistance is good, wherein, AlCr
2c material is under the environment of 70 DEG C and humidity 90%, and test discovery in 100 hours does 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 is excellent and thermal shock resistance is good.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, the restriction not to its protection domain.
For avoiding repetition, existing by as follows for the technical parameter Unify legislation involved by this embodiment, repeat no more in embodiment:
Al content >=the 99wt% of described aluminium ingot;
The granularity of described chromium powder is 5 ~ 100 μm, the Cr content >=99wt% of chromium powder;
The granularity of described Graphite Powder 99 is 5 ~ 100 μm, the C content >=99wt% of Graphite Powder 99.
Preparation process is the ar pressure in induction furnace is carry out under an atmospheric pressure, and to be a normal atmosphere be described ar pressure is realized by the influx and discharge regulating argon gas in induction furnace.
embodiment 1
One prepares 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 in induction furnace, inject argon gas to normal atmosphere; Then melt the aluminium ingot in induction furnace, aluminium ingot fusing follow-up continuing is warming up to 800 ~ 1000 DEG C, then adds chromium powder, adds Graphite Powder 99, be incubated 2 ~ 10 minutes, be finally cooled to 600 ~ 700 DEG C after chromium powder fusing, casting cooling, obtained AlCr
2c material.
Wherein: the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 adds by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
embodiment 2
One prepares 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 in induction furnace, inject argon gas to normal atmosphere; Then melt the aluminium ingot in induction furnace, aluminium ingot fusing follow-up continuing is warming up to 1000 ~ 1200 DEG C, then adds chromium powder, adds Graphite Powder 99, be incubated 10 ~ 15 minutes, be finally cooled to 700 ~ 800 DEG C after chromium powder fusing, casting cooling, obtained AlCr
2c material.
Wherein: the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 adds by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
embodiment 3
One prepares 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 in induction furnace, inject argon gas to normal atmosphere; Then melt the aluminium ingot in induction furnace, aluminium ingot fusing follow-up continuing is warming up to 1200 ~ 1400 DEG C, then adds chromium powder, adds Graphite Powder 99, be incubated 15 ~ 20 minutes, be finally cooled to 800 ~ 900 DEG C after chromium powder fusing, casting cooling, obtained AlCr
2c material.
Wherein: the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 adds by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
embodiment 4
One prepares 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 in induction furnace, inject argon gas to normal atmosphere; Then melt the aluminium ingot in induction furnace, aluminium ingot fusing follow-up continuing is warming up to 1400 ~ 1500 DEG C, then adds chromium powder, adds Graphite Powder 99, be incubated 20 ~ 25 minutes, be finally cooled to 900 ~ 1000 DEG C after chromium powder fusing, casting cooling, obtained AlCr
2c material.
Wherein: the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 adds by the mol ratio of Lv Ding ︰ Ge Fen ︰ Graphite Powder 99.
embodiment 5
One prepares 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 in induction furnace, inject argon gas to normal atmosphere; Then melt the aluminium ingot in induction furnace, aluminium ingot fusing follow-up continuing is warming up to 1500 ~ 1700 DEG C, then adds chromium powder, adds Graphite Powder 99, be incubated 25 ~ 30 minutes, be finally cooled to 900 ~ 1000 DEG C after chromium powder fusing, casting cooling, obtained AlCr
2c material.
Wherein: the add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 adds 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, make raw material inside produce eddy current thus reach heating or melt effect, under the stirring action of this alternating magnetic field, the composition of induction furnace Raw and temperature are all comparatively even, fully can 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
2the feature that C material has that chemical constitution is stablized, uniform microstructure, hydration resistance are good, has stable high-temperature performance, erosion-resisting characteristics is excellent and thermal shock resistance is good, wherein, AlCr
2c material is under the environment of 70 DEG C and humidity 90%, and test discovery in 100 hours does 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 is excellent and thermal shock resistance is 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 in induction furnace, inject argon gas to normal atmosphere; Then melt the aluminium ingot in induction furnace, aluminium ingot fusing follow-up continuing is warming up to 800 ~ 1700 DEG C, then adds chromium powder, adds Graphite Powder 99, be incubated 2 ~ 30 minutes, be finally cooled to 600 ~ 1000 DEG C after chromium powder fusing, casting cooling, obtained AlCr
2c material;
In technique scheme: preparation process is the ar pressure in induction furnace is carry out under an atmospheric pressure; The add-on of chromium powder and Graphite Powder 99 is that 1 ︰ 2 ︰ 1 adds 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, is characterized in that the granularity of described chromium powder is 5 ~ 100 μm, the Cr content>=99wt% of chromium powder.
4. prepare AlCr based on induction furnace melting according to claim 1
2the method of C material, is characterized in that the granularity of described Graphite Powder 99 is 5 ~ 100 μm, 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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| CN103789594B true CN103789594B (en) | 2015-09-16 |
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| 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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| CN100429326C (en) * | 2005-09-29 | 2008-10-29 | 中国科学院上海硅酸盐研究所 | Method for preparing 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 |
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