Low expansion superhigh silicon aluminum alloy and method for making same

A silicon-aluminum alloy, low-expansion technology, applied in the field of ultra-high silicon-aluminum alloy products and its preparation, can solve the problems of high equipment requirements and expensive manufacturing costs

Inactive Publication Date: 2005-04-13
哈尔滨天行健航天新材料有限责任公司
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide an ultra-high silicon aluminum alloy with a silicon content higher than that of the existing aluminum-silicon alloy, so as to obtain an aluminum-silicon alloy with better performance in all aspects. The present invention also provides simple processing equipment and low manufacturing cost. A method for manufacturing ultra-high silicon aluminum alloys to overcome the shortcomings of existing manufacturing methods that require high equipment and high manufacturing costs

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  • Low expansion superhigh silicon aluminum alloy and method for making same
  • Low expansion superhigh silicon aluminum alloy and method for making same

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specific Embodiment approach 1

[0006] Specific implementation mode one: the following combination figure 1 This embodiment will be specifically described. The used device of this aluminum alloy preparation method (referring to figure 2 ) consists of a punch 1, a die body 4, a press table 5 and an electric furnace 6. A low-expansion ultra-high-silicon aluminum alloy, the mass percentage of silicon in the overall alloy is 61.6%-70.8%. A method for preparing a low-expansion ultra-high silicon aluminum alloy: 1. Put the silicon powder 3 into the cavity 2 of the mold body 4, press the punch 1 downwards to press the silicon powder 3 into a prefabricated block; 2. Put the mold body 4. Preheat to 500°C-600°C, and heat the aluminum material to 700°C-800°C; 3. Pour the aluminum material into the mold body 4; 4. Apply downward pressure through the punch 1 to impregnate the metal liquid aluminum into the In the gap between the silicon powder 3 particles; the applied pressure is 40MPa ~ 60MPa; 5. The punch 1 keeps t...

specific Embodiment approach 2

[0007] Specific embodiment two: the difference between this embodiment and embodiment one is that its preparation steps are: 1. Silicon powder filling: the silicon powder with an average particle diameter of 10 μm range is packed into mold body 4 cavity, and 515g is packed into, According to the specific gravity of silicon, the silicon powder is pressed into a prefabricated block equivalent to 65% of the silicon specific gravity, and the prefabricated block is densely covered with holes or gaps. At this time, the estimated volume ratio (the volume ratio of silicon to the overall alloy) is 65%; 2. Preheating. Heat the mold body 4 with silicon powder to 600°C in the electric furnace 6, the alloy is LD11 aluminum alloy, and the LD11 aluminum alloy is heated to 700°C in another electric furnace; 3. Pouring the LD11 aluminum alloy into the mold body 4 ; 4. Pressurization: apply downward pressure through the punch 1, and the pressure is 40MPa at this time; Ingot material; 7. The in...

specific Embodiment approach 3

[0008] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the preparation steps of the ultra-high silicon aluminum alloy are: 1. Silicon powder filling: silicon powder with an average particle diameter of 10 μm and silicon powder with an average particle diameter of 20 μm 50% of the silicon powder is mixed, put into the mold body 4, put into 515g, and compact, and the expected volume ratio is 65% at this time; 2. Preheating. Heat the mold body 4 with silicon powder to 600°C in the electric furnace 6, and heat the LD11 aluminum alloy to 750°C in another electric furnace; 3. Pouring the LD11 aluminum alloy into the mold body 4; 4. Pass the punch 1 Apply downward pressure, at this time the pressure is 60MPa; 5. After the metal liquid is completely infiltrated, keep the pressure; naturally cool to about 300°C; 6. Demould, take out the ingot material of the aluminum-silicon alloy; The ingot was annealed at 410°C for 3 hours. Performance test results: the...

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Abstract

The low expansion Si-Al alloy has very high Si mass ratio of 61.6-70.8 %. The preparation process includes loading Si into mold cavity and pressing with punch head to form pre-fabricated block; preheating the mold to 500-600 deg.c and heating aluminum material to melt; casting aluminum into the mold; pressing with punch head; maintaining the pressure of the punch head while cooling the mold; demolding; and high temperature annealing of the cast ingot. The Si-Al alloy has high Si content, low density, high compactness, low expansion and other performance. The extrusion casting process to add Si element into Al alloy to form Si-Al alloy with very high Si content uses simple preparing apparatus and has low cost.

Description

Technical field: [0001] The invention relates to an ultra-high silicon aluminum alloy product and a preparation method thereof. Background technique: [0002] Ultra-high silicon aluminum alloy is a new type of aluminum alloy newly developed abroad. Due to its light weight, low expansion, high thermal conductivity, good wear resistance and other excellent properties, it is widely used in automotive engine piston rods, electronic packaging, computer Hard disk substrates and parts requiring high dimensional stability. According to the phase diagram of aluminum-silicon alloy, aluminum-silicon alloy can be divided into hypoeutectic aluminum-silicon alloy, eutectic aluminum-silicon alloy and hypereutectic aluminum-silicon alloy. With the increase of Si element content in the alloy, the density of aluminum alloy gradually decreases. The coefficient of linear expansion gradually decreases. In recent years, foreign research on ultra-high silicon aluminum alloys has been increasing,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C21/02
Inventor 武高辉修子扬张强姜龙涛
Owner 哈尔滨天行健航天新材料有限责任公司
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