Method for preparing high purity silicon carbide sintered body using high purity solid carbon material as main material by silicon blending and composition
A technology of high-purity silicon carbide and carbon materials, applied in the field of preparation methods and compositions of equipment parts, to achieve the effects of increasing strength and chemical corrosion resistance, increasing density, and fast processing speed
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Embodiment 1
[0022] The method for preparing a high-purity silicon carbide sintered body through silicon infiltration based on high-purity solid carbon materials is carried out according to the following steps:
[0023] a, take by weight 92% of carbon black.
[0024] b. Add 3% of thermosetting resin binder epoxy resin and 1% of lubricant machine oil to carbon black, put them into a mechanical mixer and stir and mix for 5 hours to make the raw materials fully uniform;
[0025] c. Put the stirred mixture into a mold for molding; the shape and size of the mold are determined by the product requirements, and molds of any shape and size can be made.
[0026] d. Put the semi-finished blanks formed by the product into the drying kiln and slowly raise the temperature to 160°C for solidification; dry and solidify for 20 hours;
[0027] e. The semi-finished product after mechanical processing is soaked in hydrochloric acid for 1 hour, and then cleaned with deionized water to remove surface adsorpti...
Embodiment 2
[0032] a, take high-purity graphite 93% by mass ratio;
[0033] b. Add 4% thermosetting adhesive phenolic resin and 3% vegetable oil to the high-purity graphite. Put it into a mechanical mixer and stir and mix for 5 hours to make the raw materials fully uniform;
[0034] c. Put the stirred mixture into the mould;
[0035] d. The semi-finished blanks formed by the product are put into the drying kiln and slowly heated to 180°C for solidification. Dry and cure for 30 hours;
[0036] e. The plain embryo is punched and grooved according to the size with a tool on a precision machine tool;
[0037] f. Soak the processed semi-finished product in hydrofluoric acid for 2 hours, and then wash it with deionized water to remove the surface adsorption impurities during processing;
[0038] g. Firing in an intermediate frequency induction furnace, the purity of the lower layer of the plain embryo is greater than 99% silicon grains, the particle size of the silicon grains is 0.5mm, and ...
Embodiment 3
[0042] Realize the composition of preparing high-purity silicon carbide sintered body by siliconizing the high-purity solid-state carbon material described in claim 1, including the described silicon carbide and free silicon, and silicon carbide accounts for 95% by mass ratio, Free silicon accounts for 5%. Carbon black 92% in the formula, the described thermosetting resin adhesive epoxy resin is 7% by mass ratio, the described lubricant is engine oil and is 1% by mass ratio, and the silicon grains of the lower layer are plain embryos 2.70 times the weight. The preparation method is the same as in Example 1.
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Abstract
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