Modifier for silicon-aluminum alloy melt and method for preparing silicon-aluminum alloy using the modifier

Abstract

A silumin alloy melt alterant is characterized by comprising the following components in percentage by weight: 8-12% of Na2SO4, 8-12% of NaCl, 16-24% of K2ZrF6, and 48-72% of Na3PO4. The invention further discloses a silumin alloy melt preparation method. Compared with the prior art, the silumin alloy melt alterant has the advantages that the alterant provided by the invention has a better alteration function, so that an alloy structure is remarkably improved, the result obtained through structure observation and analysis shows that the alloy structure is thin and tiny, the size of primary silicon is 5-25 micrometers, and the primary silicon is round and smooth in edges and has no cuspidal edge or sharp corner.

Description

technical field [0001] The invention relates to a modification agent, which is applied to the modification process of silicon-aluminum alloy, and also relates to a preparation method of silicon-aluminum alloy, which belongs to the field of alloy technology. Background technique [0002] With the continuous advancement of science and technology, the integration of electronic devices is getting higher and higher, which leads to an increase in the heating rate of electronic devices, which makes the operating temperature of the circuit continue to rise, resulting in an increase in the failure rate of components. Some electronic devices, especially those used in high-precision electronic devices, are very expensive. If they fail due to an increase in operating temperature, a material will often be prohibited from being used in this field. Therefore, the development of materials with low density, low expansion coefficient and high thermal conductivity New packaging materials with ...

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Problems solved by technology

The prepared spindle is small in size and can only be used for testing, not for engineering application

From the published literature and patents, Al-P intermediate alloys, Al-Ti-B alloys, Al-Sb alloys, and some rare earth-containing alloys are used for the modification of silicon-aluminum alloys. The patent literature can refer to the application number 200910087743.6 The Chinese invention patent application publication "a phosphating modifier" (publication number is CN101580908A), the application number is 201210502460.5 Chinese invention patent application publication "a kind of aluminum-phosphorus-strontium-rare earth alloy modifier and its preparation process" ( The publication number is CN102925765A), the silicon-aluminum alloy structure obtained in the above-mentioned literature, especially the structure with a Si content of more than 40%, is coarse, and the size of the coarse-crystalline silicon is more than 30um, which is blocky and has sharp edges and corners, which seriously affects Compared with the alloys of foreign materials, there is a big difference in the performance of the alloy.

It can be seen from the structure that there are serious problems in the modification process of silicon-aluminum alloys with a silicon content of more than 40%, and the existing modifiers cannot effectively modify silicon-aluminum alloys.

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