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Method for producing graphite-enhanced-metal-based compound material preform through in-situ solidification of silica aerogel

An in-situ solidification and silicon airgel technology, which is applied in the field of metal matrix composites, can solve the problems of inaccurate control of preform size, inability to form near-net dimensions, poor uniformity of composite materials, etc., and achieve low energy consumption and low deformation small, uniform effect

Active Publication Date: 2019-07-05
RES & DEV INST OF NORTHWESTERN POLYTECHNICAL UNIV IN SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prefabricated body prepared by the solid particle pore-making method has large pores and uneven distribution, which makes the uniformity of the composite material poor.
In addition, during the hole making process, the green body will expand as a whole, so that the size of the prefabricated body cannot be precisely controlled, and the near-net size forming cannot be performed.

Method used

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  • Method for producing graphite-enhanced-metal-based compound material preform through in-situ solidification of silica aerogel
  • Method for producing graphite-enhanced-metal-based compound material preform through in-situ solidification of silica aerogel
  • Method for producing graphite-enhanced-metal-based compound material preform through in-situ solidification of silica aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: 1. Weigh 100g of sodium hydroxide, 25g of anhydrous sodium carbonate, 25g of sodium phosphate, and 25g of 300-500 mesh flake graphite into a 1L beaker, add water to 1L, heat up to 100°C and stir for 15min, filter and use Wash with distilled water for 3 to 5 times, and dry for later use; ②. Pour the graphite in step ① into a beaker, add concentrated sulfuric acid until the graphite is submerged, heat up to 100°C and stir for 15 minutes, dilute with water, perform suction filtration, and then wash with distilled water for 3 ~5 times, dry for later use; ③, add 2ml tetraethyl orthosilicate, 10ml isopropanol, 0.5ml N,N-dimethylformamide, 0.6ml deionized water, 0.01ml hydrochloric acid into the beaker, hydrolyze After 2 hours, add 10g of graphite in step ②, and stir evenly; ④, add 0.04ml of ammonia water into the beaker, stir evenly, pour it into the mold, wait for the gel to release the mold; ⑤, put the green body in a drying oven to heat up Keep the temperature a...

Embodiment 2

[0040]Example 2: ①. Weigh 100g of sodium hydroxide, 25g of anhydrous sodium carbonate, 25g of sodium phosphate, and 25g of 300-500 mesh flake graphite into a 1L beaker. Wash with distilled water for 3 to 5 times, and dry for later use; ②. Pour the graphite in step ① into a beaker, add concentrated sulfuric acid until the graphite is submerged, heat up to 100°C and stir for 15 minutes, dilute with water, perform suction filtration, and then wash with distilled water for 3 ~5 times, dry for later use; ③, add 2ml tetraethyl orthosilicate, 10ml isopropanol, 0.5ml N,N-dimethylformamide, 0.6ml deionized water, 10ml hydrochloric acid into the beaker, hydrolyze for 2 hours Finally, add 11g of graphite in step ②, and stir evenly; ④, add 40ml of ammonia water into the beaker, stir evenly, pour it into the mold, and wait for the gel to demould; ⑤, put the green body in a drying oven and heat up to 80 ℃ for 6 hours, the temperature was raised to 110 ℃ for 6 hours, and the temperature was ...

Embodiment 3

[0041] Example 3: 1. Weigh 100g of sodium hydroxide, 25g of anhydrous sodium carbonate, 25g of sodium phosphate, and 25g of flake graphite of 300-500 mesh into a 1L beaker. Wash with distilled water for 3 to 5 times, and dry for later use; ②. Pour the graphite in step ① into a beaker, add concentrated sulfuric acid until the graphite is submerged, heat up to 100°C and stir for 15 minutes, dilute with water, perform suction filtration, and then wash with distilled water for 3 ~5 times, dry for later use; ③, add 2ml tetraethyl orthosilicate, 10ml isopropanol, 0.5ml N,N-dimethylformamide, 0.6ml deionized water, 10ml hydrochloric acid into the beaker, hydrolyze for 2 hours Finally, add 12g of graphite in step ②, and stir evenly; ④, add 40ml of ammonia water into the beaker, stir evenly, pour it into the mold, wait for the gel to be demoulded; ⑤, put the green body in a drying oven and heat up to 80 ℃ for 6 hours, the temperature was raised to 110 ℃ for 6 hours, and the temperature...

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PUM

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Abstract

The invention provides a method for producing a graphite-enhanced-metal-based compound material preform through in-situ solidification of silica aerogel. The method for producing the graphite-enhanced-metal-based compound material preform through in-situ solidification of the silica aerogel comprises the steps of stirring graphite subjected to alkali wash and acid wash, tetraethyl orthosilicate, isopropyl alcohol, N,N-dimethylformamide, deionized water, hydrochloric acid and ammonium hydroxide evenly to obtain slurry; injecting the slurry into a mould, and conducting demoulding on the mould after congelation to obtain a preform; and heating and sintering the preform to obtain the porous preform. The method for producing the graphite-enhanced-metal-based compound material preform through in-situ solidification of the silica aerogel is short in production cycle and low in energy consumption, and the graphite preform which is high in mechanical strength and even in pore distribution and capable of being subjected to near net-shape forming can be produced.

Description

technical field [0001] The invention belongs to the field of metal-based composite materials, and relates to a prefabricated body preparation process applied to extrusion infiltration, air pressure infiltration and pressureless infiltration. Background technique [0002] In recent years, the demand for thermal management materials in the field of electronic packaging has been increasing. In practice, high-performance thermal management materials not only need to have high thermal conductivity, good thermal expansion matching, and certain mechanical strength, but also meet the requirements of lightweight. Graphite reinforced metal matrix composites have the advantages of low thermal expansion coefficient, high thermal conductivity, and low density, and have shown great development and application potential in various fields. At present, the common preparation methods of graphite-reinforced metal matrix composites include extrusion infiltration, air pressure infiltration and ...

Claims

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Application Information

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IPC IPC(8): C04B30/00
CPCC04B30/00C04B24/42C04B24/026C04B24/124C04B22/06C04B22/122C04B22/062C04B22/10C04B22/16C04B14/024
Inventor 黄英彭轩懿孙旭韩小鹏樊睿
Owner RES & DEV INST OF NORTHWESTERN POLYTECHNICAL UNIV IN SHENZHEN
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