In-situ authigenic aluminum-silicon gradient composite material and preparing method thereof

A composite material, in-situ self-generating technology, applied in electrical components, circuits, electrical solid devices, etc., can solve the problems of life reduction and electronic device failure rate increase, and achieve easy processing, high wear resistance, and application prospects. expansive effect

Active Publication Date: 2019-12-10
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the failure rate of electronic devices increases sharply with the increase of operating temperature: basically every 10% increase in operating temperature o C, the lifetime of gallium arsenide or silicon semiconductor devices will drop by one-third

Method used

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  • In-situ authigenic aluminum-silicon gradient composite material and preparing method thereof
  • In-situ authigenic aluminum-silicon gradient composite material and preparing method thereof
  • In-situ authigenic aluminum-silicon gradient composite material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Place the high-purity silica quartz glass vessel with the same workpiece shape in a heating furnace and heat it to 800 o C preheating and heat preservation;

[0039] (2) will be 800 o C pure aluminum liquid is poured into step (1) in the high-purity silica quartz glass vessel, leaves standstill at 800 o C insulation;

[0040] (3) Control the holding time of step (2) for 2 hours to ensure that the aluminum liquid and silicon dioxide react, the silicon atoms diffuse into the aluminum liquid, and finally cool with the furnace;

[0041] (4) Removing the residual quartz glass on the surface of the material in step (3) to obtain an in-situ self-generated aluminum-silicon gradient composite material consistent with the shape of the quartz glass vessel.

[0042] (5) Macro organization see figure 2 , massive primary silicon is distributed in the outer ring; the mosaic diagram of the microstructure from outside to inside image 3 , it can be clearly seen that the layere...

Embodiment 2

[0044] (1) Place the high-purity silica quartz glass vessel with the same workpiece shape in a heating furnace and heat it to 800 o C preheating and heat preservation;

[0045] (2) Melt high-purity aluminum in a high-purity aluminum oxide ceramic crucible, and add 3wt.% lanthanum to the aluminum liquid.

[0046] (3) Step (2) molten aluminum is heated to 800 o C is poured into step (1) in the high-purity silica quartz glass vessel, leaves standstill at 800 o C insulation;

[0047] (4) Control the holding time of step (3) for 2 hours to ensure that the aluminum liquid and silicon dioxide react, and the silicon atoms diffuse into the aluminum liquid, and finally cool with the furnace;

[0048] (5) Removing the residual quartz glass on the surface of the material in step (4) to obtain an in-situ self-generated aluminum-silicon gradient composite material consistent with the shape of the quartz glass vessel.

[0049] (6) See macro organization chart Figure 5 (The white spots ...

Embodiment 3

[0051] (1) Place the high-purity silica quartz glass vessel with the same workpiece shape in a heating furnace and heat it to 800 o C preheating and heat preservation;

[0052] (2) Melt high-purity aluminum in a high-purity aluminum oxide ceramic crucible, and add 1.00wt.% cerium to the aluminum liquid.

[0053] (3) Step (2) molten aluminum is heated to 800 o C is poured into step (1) in the high-purity silica quartz glass vessel, leaves standstill at 800 o C insulation;

[0054] (4) Control the holding time of step (3) for 2 hours to ensure that the aluminum liquid and silicon dioxide react, and the silicon atoms diffuse into the aluminum liquid, and finally cool with the furnace;

[0055] (5) Removing the residual quartz glass on the surface of the material in step (4) to obtain an in-situ self-generated aluminum-silicon gradient composite material consistent with the shape of the quartz glass vessel.

[0056] (6) See macro organization chart Figure 7 (The white spots ...

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Abstract

The invention relates to an in-situ authigenic aluminum-silicon gradient composite material and a preparing method thereof. According to the in-situ authigenic aluminum-silicon gradient composite material, the silicon content is gradually reduced from the surface to the core part, and the in-situ authigenic aluminum-silicon gradient composite material is formed in a manner that an outer-layer hypereutectic high-silicon organization layer is in gradual transition to an inner eutectic aluminum-silicon organization layer, or the outer-layer hypereutectic high-silicon organization layer is in transition to the eutectic aluminum-silicon organization layer, then the eutectic aluminum-silicon organization layer is in transition to a hypo-eutectic aluminum-silicon organization layer, or the outer-layer hypereutectic high-silicon organization layer is in transition to the eutectic aluminum-silicon organization layer, then the eutectic aluminum-silicon organization layer is in transition to thehypo-eutectic aluminum-silicon organization layer, and finally, a pure aluminum layer is taken as the core part. All organization layers of the material are in smooth transition, and no obvious interface exists. To solve the problem that massive primary silicon and acicular eutectic silicon exist in an aluminum-silicon gradient composite material, firstly, a lanthanum or cerium alterant is added in a pure aluminum liquid, and then the mixed aluminum liquid reacts with silicon dioxide to obtain the aluminum-silicon gradient composite material. In this way, the morphology of primary silicon andeutectic silicon is improved, and finally, round-head short-rod-shaped or round-head grain-shaped primary silicon and eutectic silicon are obtained.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for preparing an in-situ self-generated aluminum-silicon gradient composite material. Background technique [0002] High-silicon aluminum alloy has high high-temperature strength, good thermal stability and high wear resistance, and is an ideal wear-resistant material. It has been widely used in the fields of automobiles, motorcycles, and military industries, such as wear-resistant parts such as pistons, cylinder liners, and brake discs of tanks, motorcycles, and automobiles. The use of aluminum alloy engines has become an important direction to fully replace cast iron engines and cast iron cylinder liner engines. However, due to the large difference in microhardness between primary silicon (microhardness value of HV1000-1300) and matrix aluminum (microhardness value of cast aluminum is HV60-100), the hard The primary silicon particles are extruded with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03H01L23/29
CPCC22C1/026C22C1/03C22C21/04H01L23/29
Inventor 李发国施东明胡孝愿
Owner XIANGTAN UNIV
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