CN104451223A - Method for preparing SiC/Mg alloy material - Google Patents

Method for preparing SiC/Mg alloy material Download PDF

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CN104451223A
CN104451223A CN201410595478.3A CN201410595478A CN104451223A CN 104451223 A CN104451223 A CN 104451223A CN 201410595478 A CN201410595478 A CN 201410595478A CN 104451223 A CN104451223 A CN 104451223A
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powder
alloy material
parts
preparation
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CN104451223B (en
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刘莉
王爽
刘晓东
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Kaisi Baoma hardware technology (Jiangsu) Co.,Ltd.
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Suzhou Netshape Composite Materials Co Ltd
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Abstract

The invention relates to a method for preparing a SiC/Mg alloy material, and belongs to the technical field of powder metallurgy. The method comprises the following steps: 1 mixing 10-20 parts by weight of SiC with 15-30 parts by weight of sodium carbonate evenly, putting into a quartz boat, heating and warming to 700-800 DEG C, carrying out heat preservation, cooling, and then washing a solid substance into constant weight with diluted hydrochloric acid, so as to obtain etched SiC; 2 mixing the etched SiC, 5-10 parts of aluminite powder, 5-10 zinc powder and 5-10 parts of stearic acid evenly, and carrying out ball-milling, so as to obtain a mixture; and 3 mixing the mixture with 50-80 parts of magnesium powder evenly, and then sintering to obtain the alloy material. Through etching the surface of the SiC, an uneven morphology is formed; lapping of the zinc powder and the aluminite powder is facilitated; a clamping structure is formed between the zinc powder and the aluminite powder; mutual integration in the sintering process is facilitated; and the friction performance of the material is improved.

Description

A kind of preparation method of SiC/Mg alloy material
 
Technical field
The present invention relates to a kind of preparation method of SiC/Mg alloy material, belong to powder metallurgical technology.
 
Background technology
In order to improve, magnesium alloy strength is low, the shortcoming of poor mechanical property, scientific and technical personnel add high-strength, high-modulus carbon fiber, silicon carbide fiber etc. and make matrix material in magnesium alloy, continuous fiber reinforced composite materials obtains very high specific tenacity and specific rigidity, becomes the important structured material of Aeronautics and Astronautics.Magnesium base composite material has high specific strength, specific rigidity and excellent castability makes it be used widely in the field such as aviation, automobile.Promote in civilian to make magnesium base composite material, the magnesium base composite material of necessary Low-cost, therefore people begin one's study again discontinuous reinforcement magnesium base composite material, and discontinuous reinforcement magnesium base composite material is the another competitive light metal-based matrix material after aluminum matrix composite.The discontinuous reinforcement magnesium base composite material that current system is each, that reinforce is used more is SiC, B4C, Al 2o 3deng particle and whisker.The matrix of general conventional magnesium base composite material adopts conventional cast magnesium alloys A291D, wrought magnesium alloys MB15 etc.From late 1980s, magnesium base composite material is one of study hotspot becoming field of metal matrix composite.Past is to the needs of a large amount of research work of this material mainly for national defence and aerospace application, along with the researchdevelopment of novel manufacturing process, magnesium base composite material obtains and applies widely in the engineering of space flight and aviation, automobile, nuclear industry, movement entertainment and other advanced persons.The current research work magnesium alloy materials about magnesium base composite material is commonly used reinforcement magnesium alloy materials selective enhancement body and is required that physics, chemical compatibility are good, avoid the surface reaction between reinforcement and matrix alloy as far as possible, wettability is good, and load carrying capacity is strong.Conventional reinforcement mainly contains fiber C, fiber B, Al 2o 3staple fibre, SiC whisker, B4C particle, SiC particle and Al 2o 3particle etc.
At present, the existing a lot of report of the research of each particle reinforced magnesium base compound material of casting legal system is adopted.Powder metallurgic method is compared with common fusion casting, and can produce the exotic materials of more difficult production, product's dimensional precision is high, can avoid being mixed into by thaw process generation material chemical composition change and impurity; Sintering is selected to carry out in vacuum system, and material is not oxidized, and also can not pollute, and composition proportion is accurate, can reduce the segregation of alloying constituent to greatest extent, eliminate thick, uneven cast structure.But prepare particulate reinforced composite performance by powder metallurgic method and also there is larger discreteness, this can become the important factor hindering magnesium base composite material to enter large-scale industrial production.And the SiC/Mg alloy material adopting conventional powder metallurgic method to prepare still also exists the not high problem of frictional behaviour.
 
Summary of the invention
Technical problem to be solved by this invention is that the frictional behaviour of magnesium-silicon carbide alloys material is not high, improves its technical scheme, proposes a kind of preparation method of SiC/Mg alloy material.
Technical scheme:
A preparation method for SiC/Mg alloy material, comprises the steps:
1st step, by weight, get SiC 10 ~ 20 parts, 15 ~ 30 parts, sodium carbonate, after mixing, be positioned in quartz boat, be heated to 700 ~ 800 DEG C, insulation, after letting cool, by solids with dilute hydrochloric acid washing to constant weight, obtain etching SiC;
2nd step, etching SiC, aluminium powder 5 ~ 10 parts, zinc powder 5 ~ 10 parts, stearic acid 5 ~ 10 parts to be mixed, after ball milling, obtain mixture;
3rd step, 50 ~ 80 parts, mixture and magnesium powder to be mixed, then sinter, obtain alloy material.
In the 1st described step, heat-up rate is 10 DEG C/minute.
In the 1st described step, soaking time is 3 ~ 5 minutes.
In the 3rd described step, sintering temperature 450 ~ 550 DEG C.
In the 3rd described step, sintering time is 20 ~ 30 minutes.
In the 3rd described step, sintering pressure is 2 ~ 4 MPa.
In the 1st described step, the median size of SiC is 100 ~ 500 microns.
In the 2nd described step, the median size of aluminium powder and zinc powder is 50 ~ 200 microns.
In the 2nd described step, also need to add copper powder 1 ~ 2 part and/or 1 ~ 2 part, molybdic oxide powder.
 
beneficial effect
The present invention, by etching the surface of SiC, forms irregular pattern, is more conducive to the overlap joint with zinc powder, aluminium powder, makes to form interface arrangment each other, is conducive to mutually integrating in sintering process, improves the frictional behaviour of material.
 
Embodiment
 
embodiment 1
1st step, to get SiC 10g(median size be 200 microns), sodium carbonate 15g, after mixing, be positioned in quartz boat, be heated to 700 DEG C, heat-up rate is 10 DEG C/minute, insulation, and soaking time is 3 minutes, after letting cool, solids dilute hydrochloric acid is washed to constant weight, obtains etching SiC;
2nd step, etching SiC, aluminium powder 5g (median size is 50 microns), zinc powder 5g (median size is 50 microns), stearic acid 5g to be mixed, after ball milling, obtain mixture;
3rd step, mixed with magnesium powder 50g by mixture, then sinter, sintering temperature 450 DEG C, sintering time is 20 minutes, and sintering pressure is 2 MPa, obtains alloy material.
 
embodiment 2
1st step, to get SiC 20g(median size be 200 microns), sodium carbonate 30g, after mixing, be positioned in quartz boat, be heated to 800 DEG C, heat-up rate is 10 DEG C/minute, insulation, and soaking time is 5 minutes, after letting cool, solids dilute hydrochloric acid is washed to constant weight, obtains etching SiC;
2nd step, etching SiC, aluminium powder 10g (median size is 50 microns), zinc powder 10g (median size is 50 microns), stearic acid 10g to be mixed, after ball milling, obtain mixture;
3rd step, mixed with magnesium powder 80g by mixture, then sinter, sintering temperature 550 DEG C, sintering time is 30 minutes, and sintering pressure is 4 MPa, obtains alloy material.
 
embodiment 3
1st step, to get SiC 15g(median size be 200 microns), sodium carbonate 20g, after mixing, be positioned in quartz boat, be heated to 750 DEG C, heat-up rate is 10 DEG C/minute, insulation, and soaking time is 4 minutes, after letting cool, solids dilute hydrochloric acid is washed to constant weight, obtains etching SiC;
2nd step, etching SiC, aluminium powder 7g (median size is 50 microns), zinc powder 8g (median size is 50 microns), stearic acid 8g to be mixed, after ball milling, obtain mixture;
3rd step, mixed with magnesium powder 50 ~ 80g by mixture, then sinter, sintering temperature 500 DEG C, sintering time is 25 minutes, and sintering pressure is 3 MPa, obtains alloy material.
 
embodiment 4
Be with the difference of embodiment 3: in the 2nd step, also add copper powder 1g.
1st step, to get SiC 15g(median size be 200 microns), sodium carbonate 20g, after mixing, be positioned in quartz boat, be heated to 750 DEG C, heat-up rate is 10 DEG C/minute, insulation, and soaking time is 4 minutes, after letting cool, solids dilute hydrochloric acid is washed to constant weight, obtains etching SiC;
2nd step, etching SiC, aluminium powder 7g (median size is 50 microns), zinc powder 8g (median size is 50 microns), stearic acid 8g, copper powder 1g to be mixed, after ball milling, obtain mixture;
3rd step, mixed with magnesium powder 50 ~ 80g by mixture, then sinter, sintering temperature 500 DEG C, sintering time is 25 minutes, and sintering pressure is 3 MPa, obtains alloy material.
 
embodiment 5
Be with the difference of embodiment 3: in the 2nd step, also add molybdic oxide powder 1g.
1st step, to get SiC 15g(median size be 200 microns), sodium carbonate 20g, after mixing, be positioned in quartz boat, be heated to 750 DEG C, heat-up rate is 10 DEG C/minute, insulation, and soaking time is 4 minutes, after letting cool, solids dilute hydrochloric acid is washed to constant weight, obtains etching SiC;
2nd step, etching SiC, aluminium powder 7g (median size is 50 microns), zinc powder 8g (median size is 50 microns), stearic acid 8g, molybdic oxide powder 1g to be mixed, after ball milling, obtain mixture;
3rd step, mixed with magnesium powder 50 ~ 80g by mixture, then sinter, sintering temperature 500 DEG C, sintering time is 25 minutes, and sintering pressure is 3 MPa, obtains alloy material.
 
embodiment 6
Be with the difference of embodiment 3: also add in the 2nd step into copper powder 1g and molybdic oxide powder 1g.
1st step, to get SiC 15g(median size be 200 microns), sodium carbonate 20g, after mixing, be positioned in quartz boat, be heated to 750 DEG C, heat-up rate is 10 DEG C/minute, insulation, and soaking time is 4 minutes, after letting cool, solids dilute hydrochloric acid is washed to constant weight, obtains etching SiC;
2nd step, etching SiC, aluminium powder 7g (median size is 50 microns), zinc powder 8g (median size is 50 microns), stearic acid 8g, molybdic oxide powder 1g, copper powder 1g to be mixed, after ball milling, obtain mixture;
3rd step, mixed with magnesium powder 50 ~ 80g by mixture, then sinter, sintering temperature 500 DEG C, sintering time is 25 minutes, and sintering pressure is 3 MPa, obtains alloy material.
 
reference examples
1st step, be 200 microns by SiC 15g(median size), aluminium powder 7g (median size is 50 microns), zinc powder 8g (median size is 50 microns), stearic acid 8g, molybdic oxide powder 1g, copper powder 1g mix, after ball milling, obtain mixture;
2nd step, mixed with magnesium powder 50 ~ 80g by mixture, then sinter, sintering temperature 500 DEG C, sintering time is 25 minutes, and sintering pressure is 3 MPa, obtains alloy material.
 
performance test
Friction-wear test is carried out on MMW-1 type friction wear testing machine, test conditions is metal to-metal contact rotary motion, adopt little thrust ring friction pair test method, mating material is 45 steel quenching steel loops, hardness is 44-46HRC, the speed of mainshaft is set to 240r/min, and load is 40N, and the time is 10min.
The frictional behaviour of alloy material for preparing of each embodiment and reference examples is as shown in the table above:
As can be seen from the table, the SiC material in reference examples, not through over etching, causes not easily forming bridging arrangement with other metallic particles in the sintering process of alloy material, causes the frictional behaviour of material bad.

Claims (9)

1. a preparation method for SiC/Mg alloy material, is characterized in that, comprises the steps:
1st step, by weight, get SiC 10 ~ 20 parts, 15 ~ 30 parts, sodium carbonate, after mixing, be positioned in quartz boat, be heated to 700 ~ 800 DEG C, insulation, after letting cool, by solids with dilute hydrochloric acid washing to constant weight, obtain etching SiC;
2nd step, etching SiC, aluminium powder 5 ~ 10 parts, zinc powder 5 ~ 10 parts, stearic acid 5 ~ 10 parts to be mixed, after ball milling, obtain mixture;
3rd step, 50 ~ 80 parts, mixture and magnesium powder to be mixed, then sinter, obtain alloy material.
2. the preparation method of SiC/Mg alloy material according to claim 1, is characterized in that: in the 1st described step, heat-up rate is 10 DEG C/minute.
3. the preparation method of SiC/Mg alloy material according to claim 1, is characterized in that: in the 1st described step, soaking time is 3 ~ 5 minutes.
4. the preparation method of SiC/Mg alloy material according to claim 1, is characterized in that: in the 3rd described step, sintering temperature 450 ~ 550 DEG C.
5. the preparation method of SiC/Mg alloy material according to claim 1, is characterized in that: in the 3rd described step, sintering time is 20 ~ 30 minutes.
6. the preparation method of SiC/Mg alloy material according to claim 1, is characterized in that: in the 3rd described step, sintering pressure is preferably 2 ~ 4 MPa.
7. the preparation method of SiC/Mg alloy material according to claim 1, is characterized in that: in the 1st described step, the median size of SiC is preferably 100 ~ 500 microns.
8. the preparation method of SiC/Mg alloy material according to claim 1, is characterized in that: in the 2nd described step, the median size of aluminium powder and zinc powder is preferably 50 ~ 200 microns.
9. the preparation method of SiC/Mg alloy material according to claim 1, is characterized in that: in the 2nd described step, also needs to add copper powder 1 ~ 2 part and/or 1 ~ 2 part, molybdic oxide powder.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107447122A (en) * 2017-08-04 2017-12-08 江苏中科亚美新材料有限公司 The preparation method of magnesium alloy

Citations (5)

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Publication number Priority date Publication date Assignee Title
EP0488996A2 (en) * 1987-12-12 1992-06-03 Fujitsu Limited Sintered magnesium-based composite material and process for preparing same
CN1837392A (en) * 2006-04-03 2006-09-27 重庆大学 Composite material of magnesium alloy and method for preparing the same
US20090074603A1 (en) * 2007-09-14 2009-03-19 Tsinghua University Method for making magnesium-based composite material and equipment for making the same
CN102251133A (en) * 2011-08-16 2011-11-23 黄河科技学院 Powder metallurgy preparation method of SiC/magnesium alloy AZ91 composite
CN102864361A (en) * 2012-08-17 2013-01-09 河南科技大学 SiC enhanced aluminum-based composite material for spacecraft and preparation method thereof

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
EP0488996A2 (en) * 1987-12-12 1992-06-03 Fujitsu Limited Sintered magnesium-based composite material and process for preparing same
CN1837392A (en) * 2006-04-03 2006-09-27 重庆大学 Composite material of magnesium alloy and method for preparing the same
US20090074603A1 (en) * 2007-09-14 2009-03-19 Tsinghua University Method for making magnesium-based composite material and equipment for making the same
CN102251133A (en) * 2011-08-16 2011-11-23 黄河科技学院 Powder metallurgy preparation method of SiC/magnesium alloy AZ91 composite
CN102864361A (en) * 2012-08-17 2013-01-09 河南科技大学 SiC enhanced aluminum-based composite material for spacecraft and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107447122A (en) * 2017-08-04 2017-12-08 江苏中科亚美新材料有限公司 The preparation method of magnesium alloy

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