| abstract |
The invention discloses a light carbon/carbon composite material heat preservation cylinder for crystalline silicon, which comprises an inner high-density cylinder, an outer high-density cylinder, and an inner-layer high-density cylinder and an outer-layer high-density cylinder arranged between the inner high-density cylinder and the outer high-density cylinder. A low-density intermediate layer between the inner layer and the outer high-density cylinder is deposited with a pyrolytic carbon coating; the invention also provides a light carbon/carbon composite material for crystalline silicon The preparation method of the thermal insulation cylinder: first, the carbon fiber preform is densified; second, the carbon/carbon composite material thermal insulation cylinder blank is obtained by machining; third, the surface is purified by chemical vapor deposition. The pyrolytic carbon coating deposited on the inner and outer high-density cylinder bodies of the carbon/carbon composite material insulation cylinder of the present invention is uniform and dense, which prevents the erosion of molten silicon liquid and silicon-containing vapor, and the low-density intermediate layer ensures thermal insulation. Therefore, it has excellent corrosion resistance and good thermal insulation performance, and the overall light weight of the thermal insulation cylinder is convenient to use. |