CN102994822A - Preparation method for generating low-expansion coefficient aluminum matrix composite by using magnetochemistry - Google Patents
Preparation method for generating low-expansion coefficient aluminum matrix composite by using magnetochemistry Download PDFInfo
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- CN102994822A CN102994822A CN2012104703257A CN201210470325A CN102994822A CN 102994822 A CN102994822 A CN 102994822A CN 2012104703257 A CN2012104703257 A CN 2012104703257A CN 201210470325 A CN201210470325 A CN 201210470325A CN 102994822 A CN102994822 A CN 102994822A
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Abstract
The invention provides a preparation method for generating a low-expansion coefficient aluminum matrix composite by using magnetochemistry, which comprises the following steps of:placing K2TiF6 powder and KBF4 powder with the molar ratio of 1:2 in a high-silicon aluminum alloy melt, and generating dual ceramic particles Al3Ti and TiB2 in the high-silicon aluminum alloy melt by using an in-situ reaction technology under a low-frequency rotary magnetic field to prepare the low-expansion coefficient aluminum matrix composite. By using the in-situ reaction technology under the low-frequency rotary magnetic field for preparing the low-expansion coefficient aluminum matrix composite, the preparation method realizes that the expansion coefficient of the original high-silicon aluminum alloy material is obviously reduced, the low-expansion coefficient composite also has the advantages of high specific strength and specific stiffness and favorable toughness and wear resistance. Therefore, the low-expansion coefficient composite can replace the original material in many fields and prolong the service life of parts by using ultralow expansion coefficient so that the using cost of the parts is greatly reduced, and the parts have high efficiency, durability and environmental protection.
Description
Technical field
The invention belongs to the material technology preparing technical field, relate to a kind of magneto-chemistry and generate low-expansion coefficient aluminum matrix composite, specifically Al
3Ti and TiB
2The preparation method that the binary ceramic particle strengthens silumin has realized the obvious reduction of thermal expansivity.
Background technology
Silumin has low thermal coefficient of expansion because of it; can be complementary with chips such as Si, GaAs; can shield to chip good heat conductivity, in time heat radiation; resistance to air loss is good; high temperature resistant, corrosion-resistant, radioprotective have high specific strength, specific rigidity simultaneously, good machine-shaping property and low density; the advantage such as with low cost is the important materials for aerospace, Electronic Packaging etc. always.Be widely used in the Electronic Packaging carrying electronic devices and components and phase interconnection line thereof, play machinery support, the sealed environment protection, the signal transmission, the effects such as heat radiation and shielding are the sealing members of unicircuit, and the Performance And Reliability of circuit is had very important impact.A lot of countries all attempt producing this alloy with different methods in effort now.Because its excellent over-all properties is constantly agreed with to miniaturization, high-performance, high reliability and low-cost future development mutually with electronic package material just, so that very urgent to the demand of this kind alloy.
Reaction in－situ synthetic technology (Reactive Synthesis) is at first to be proposed by Koczak etc. in 1989, claims again in-situ composite (In-situ Composites) for the preparation of particles reiforced metal-base composition.This technology generates that to strengthen the surface pollution-free, has avoided the problem bad with the matrix phase capacitive, and the interface bond strength height is because to strengthen body be from metallic matrix situ forming core, the thermodynamically stable phase of growing up.Thereby such technology is described as and has breakthrough new technology, become a new highlight in the aluminum matrix composite research.The development of reaction in－situ technology also provides an a new direction for seeking low-expansion material.
Summary of the invention
The object of the present invention is to provide a kind of magneto-chemistry to generate the low-expansion coefficient aluminum matrix composite, another purpose is to provide a kind of magneto-chemistry to generate the preparation method of low-expansion coefficient aluminum matrix composite, utilize the reaction in－situ technical matters to add low frequency rotating magnetic field and prepare two-component particle enhancing silumin, thereby reach the obvious reduction of thermal expansivity.
Technical scheme of the present invention is:
Low-expansion material of the present invention is in the silumin melt, inserts in the powder prewired K that makes of routine 1:2 ratio in molar ratio
2TiF
6Powder and KBF
4Powder is under the effect in low frequency rotating magnetic field, so that K
2TiF
6Powder and KBF
4The powder disperse is distributed in the melt, and with alloy melt in the Al element violent chemical reaction occurs generates respectively binary enhanced granule Al
3Ti and TiB
2, finally make low-expansion coefficient aluminum matrix composite of the present invention.
Its concrete preparation process is: (1) will be by K
2TiF
6Powder and KBF
4Powder is ready for use in proportion; (2) silumin is treated to molten state; (3) with the prewired K that makes
2TiF
6Powder and KBF
4Powder is inserted in the silumin melt, carries out reaction in－situ; (4) use immediately low frequency rotating magnetic field that reaction melt is processed; (5) in the casting of the melt after will the processing part mould, obtain at last this low-expansion coefficient aluminum matrix composite.
Silumin described in the present invention is Al-(20%-50%) the Si alloy.
K in the above-mentioned steps (1)
2TiF
6Powder and KBF
4Powder molar ratio 1:2.
The melt in situ temperature of reaction is 850 ℃-870 ℃ in the above-mentioned steps (3).
Above-mentioned steps (4) uses low frequency rotating magnetic field that reaction melt is processed; Control magnetizing current 200A-220A, frequency 3Hz-5Hz, action time 3min-5min.
The thermal expansivity of former silumin is 8.5 * 10
-6/ K-12 * 10
-6/ K, and the present invention to utilize the aluminum matrix composite thermal expansivity of the preparation of reaction in－situ technology under the low frequency rotating magnetic field be 3 * 10
-6/ K-6 * 10
-6/ K almost is reduced to original 1/2nd.This invention material has higher intensity in addition, and good toughness, and light-weight environment-friendly, some component structural that not only can be used for aircraft, and be widely used in the encapsulation of electronic material, can prolong life-span of electronic product with its super-low expansion coefficient, avoid component to damage owing to thermal expansion occurs excess Temperature, reduce simultaneously the part use cost.
Preparation method's technique of the present invention is simple, easy to operate, realizes easily industrial-scale production, and used silumin and K
2TiF
6, KBF
4The reaction pulvis, the source is abundant, and is cheap.
To sum up, material of the present invention has not only kept original specific tenacity and toughness preferably, and decrease the thermal expansivity of aluminum matrix composite, most importantly provided the preparation method who is easy to promote with low cost.
Embodiment
The present invention is further elaborated below in conjunction with embodiment.
Embodiment 1
Preparation 10kg this low-expansion coefficient aluminum matrix composite, wherein TiB
2Weight percentages of components 10%, and Al3Ti weight percentages of components 18%, all the other are the Al-20%Si alloy;
(1) batching: K
2TiF
63.4kg, KBF
43.6kg, Al-20%Si alloy 9.64kg
(2) first with K
2TiF
6, KBF
4Powder is after 1:2 mixes in molar ratio, the Al-20%Si aluminum alloy ingot is put into plumbago crucible, be placed in the well-type electric furnace of 30kW and carry out melting, be warming up to 850 ℃, the mixed powder of getting ready is in advance placed in the crucible, be pressed into bell jar simultaneously and carry out reaction in－situ in the melt.
(3) add immediately simultaneously low frequency rotating magnetic field control magnetizing current 200A, frequency 5Hz, action time 3min.
(4) after the low frequency rotating magnetic field treatment finished, melt left standstill 5min, and temperature is down to 700-730 ℃, and refining is skimmed, and pours into water cooled copper mould.
The aluminum matrix composite thermal expansivity that obtains under this condition is 5.6 * 10
-6/ K, and the thermal expansivity of former Al-20%Si aluminium alloy is 11 * 10
-6/ K this shows, the two-component particle reinforced aluminum matrix composites thermal expansivity for preparing under the magneto-chemistry has obtained obvious reduction.
Embodiment 2
Preparation 10kg this low-expansion coefficient aluminum matrix composite, wherein TiB
2Weight percentages of components 10%, and Al
3Ti weight percentages of components 18%, all the other are the Al-50%Si alloy;
(1) batching: K
2TiF
63.4kg, KBF
43.6kg, Al-50%Si alloy 9.64kg
(2) first with K
2TiF
6, KBF
4Powder is after 1:2 mixes in molar ratio, the Al-50%Si aluminum alloy ingot is put into plumbago crucible, be placed in the well-type electric furnace of 30kW and carry out melting, be warming up to 870 ℃, the mixed powder of getting ready is in advance placed in the crucible, be pressed into bell jar simultaneously and carry out reaction in－situ in the melt.
(3) add immediately simultaneously low frequency rotating magnetic field control magnetizing current 220A, frequency 3Hz, action time 5min.
(4) after the low frequency rotating magnetic field treatment finished, melt left standstill 5min, and temperature is down to 700-730 ℃, and refining is skimmed, and pours into water cooled copper mould.
The aluminum matrix composite thermal expansivity that obtains under this condition is 3 * 10
-6/ K, and the thermal expansivity of former Al-50%Si aluminium alloy is 8.5 * 10
-6/ K this shows, the two-component particle reinforced aluminum matrix composites thermal expansivity that is prepared under the higher magneto-chemistry of silicon percentage composition has obtained reduction by a larger margin.
Claims (6)
1. a magneto-chemistry generates the low-expansion coefficient aluminum matrix composite, it is characterized in that making by following method: in the silumin melt, insert the in molar ratio prewired K that makes of routine 1:2
2TiF6 powder and KBF
4Powder generates respectively the enhanced granule Al of binary in the silumin melt by the reaction in－situ under the low frequency rotating magnetic field
3Ti and TiB
2, Al wherein
3Ti and TiB
2The total mass mark is the 20%-30% of alloy.
2. a magneto-chemistry generates the preparation method of low-expansion coefficient aluminum matrix composite, and it is characterized in that: the method comprises the steps:
(1) with K
2TiF
6Powder and KBF
4Powder is routine 1:2 ready for use in molar ratio;
(2) with the silumin melting;
(3) with K
2TiF
6Powder and KBF
4Powder by powder in molar ratio routine 1:2 place the silumin melt, carry out reaction in－situ;
(4) use immediately low frequency rotating magnetic field that reaction melt is processed;
(5) will process in the rear melt casting die, obtain this low-expansion coefficient aluminum matrix composite.
3. method according to claim 2, it is characterized in that: described silumin is Al-(20%-50%) the Si alloy.
4. method according to claim 2 is characterized in that: K
2TiF
6Powder and KBF
4Powder molar ratio 1:2.
5. method according to claim 2, it is characterized in that: the melt in situ temperature of reaction is 850 ℃-870 ℃ in the step 3.
6. method according to claim 2 is characterized in that: step 4 uses low frequency rotating magnetic field that reaction melt is processed; Control magnetizing current 200-220A, frequency 3-5Hz, action time 3min-5min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086544A (en) * | 2016-08-08 | 2016-11-09 | 中南大学 | A kind of alloying element strengthens high aluminium silicon composite material and preparation method thereof |
| CN110229979A (en) * | 2019-07-05 | 2019-09-13 | 西安交通大学 | A kind of transgranular crystal boundary distribution micro-nano multiphase granules reinforced aluminum matrix composites and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1667147A (en) * | 2005-04-05 | 2005-09-14 | 江苏大学 | Preparation method of endogenous particle reinforced aluminium-based composite material |
| CN1676641A (en) * | 2005-03-31 | 2005-10-05 | 江苏大学 | Magnetic chemical reaction in-situ synthesizing method for preparing metal base nano composite material |
-
2012
- 2012-11-20 CN CN2012104703257A patent/CN102994822A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676641A (en) * | 2005-03-31 | 2005-10-05 | 江苏大学 | Magnetic chemical reaction in-situ synthesizing method for preparing metal base nano composite material |
| CN1667147A (en) * | 2005-04-05 | 2005-09-14 | 江苏大学 | Preparation method of endogenous particle reinforced aluminium-based composite material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086544A (en) * | 2016-08-08 | 2016-11-09 | 中南大学 | A kind of alloying element strengthens high aluminium silicon composite material and preparation method thereof |
| CN110229979A (en) * | 2019-07-05 | 2019-09-13 | 西安交通大学 | A kind of transgranular crystal boundary distribution micro-nano multiphase granules reinforced aluminum matrix composites and preparation method thereof |
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Application publication date: 20130327 |