Raw material composition for graphite-silicon carbide crucible and manufacturing process thereof

A technology of silicon carbide crucible and raw material composition, which is applied in the field of crucible for smelting non-ferrous metals, can solve the problems of polluting the environment and releasing a large amount of harmful smoke and dust, and achieves the effects of uniform texture, low porosity and fast heat conduction

Inactive Publication Date: 2014-08-06
QINGDAO BAIDUN CRUCIBLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, resin, tar and asphalt will release a large amount of harmful smoke and dust during the firing process, polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The raw material composition for preparing the graphite-silicon carbide crucible in this example includes the following raw materials in weight percentage: 47% of flake graphite, 36% of silicon carbide, 8% of elemental silicon powder, 2% of boron carbide powder, and 7% of kaolin.

[0019] The manufacturing process of described graphite-silicon carbide crucible comprises the following steps:

[0020] (1) Put the prepared raw materials into the mixer and mix evenly, add water, mix evenly, and make mud;

[0021] (2) Store the above mud for one day, and dry it into a qualified mud with a volatile content of 1.4%;

[0022] (3) Put the qualified mud into the mold, beat it compactly, put it into the cylinder of the isostatic press, and press it under 70MPa pressure;

[0023] (4) Demoulding, put the blank on the drying car, slowly heat up to 120°C in the drying kiln, and dry thoroughly;

[0024] (5) Coat the surface of the crucible with an anti-oxidation glaze while it is hot...

Embodiment 2

[0028] The raw material composition for preparing graphite-silicon carbide crucible in this example includes the following raw materials in weight percentage: 45% of flake graphite, 29% of silicon carbide, 6% of elemental silicon powder, 2% of boron carbide powder, 10% of Guangxi white mud, polyethylene 8% alcohol solution.

[0029] The manufacturing process of described graphite-silicon carbide crucible comprises the following steps:

[0030] (1) Put the prepared raw materials into the mixer and mix evenly, add water and polyvinyl alcohol aqueous solution, mix evenly, and make mud;

[0031] (2) Store the above mud for one day and dry it into qualified mud with a volatile content of 1.5%;

[0032] (3) Put the qualified mud into the mold, beat it compactly, put it into the cylinder of the isostatic press, and press it under 80MPa pressure;

[0033] (4) Demoulding, put the blank on the drying car, slowly heat up to 120°C in the drying kiln, and dry thoroughly;

[0034] (5) Co...

Embodiment 3

[0038] The raw material composition for preparing graphite-silicon carbide crucible in this example includes the following raw materials in weight percentage: flake graphite 42%, silicon carbide 26%, elemental silicon powder 5%, boron carbide powder 4%, wood knot soil 13%, lignin 10% aqueous solution.

[0039] The manufacturing process of described graphite-silicon carbide crucible comprises the following steps:

[0040] (1) Put the prepared raw materials into the mixer and mix evenly, add water and lignin aqueous solution, mix evenly, and make mud;

[0041] (2) Store the above mud for one day and dry it into a qualified mud with a volatile content of 1.3%;

[0042] (3) Put the qualified mud into the mold, beat it compactly, put it into the cylinder of the isostatic press, and press it under 90MPa pressure;

[0043] (4) Demoulding, put the blank on the drying car, slowly heat up to 120°C in the drying kiln, and dry thoroughly;

[0044] (5) Coat the surface of the crucible w...

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Abstract

The invention discloses a raw material composition for a graphite-silicon carbide crucible. The raw material composition comprises the following raw materials in percentage by weight: 40% to 50% of flake graphite, 20% to 50% of silicon carbide, 4% to 10% of elemental silicon powder, 1% to 5% of boron carbide powder, and 5% to 15% of clay. The manufacturing process of the graphite-silicon carbide crucible comprises the following steps: mixing raw materials evenly, and manufacturing qualified mud materials; loading the qualified mud materials into moulds, putting the moulds into an isostatic press cylinder, and pressing and shaping; demoulding, drying blanks, and coating anti-oxidation glaze when the blanks are hot; then burning the blanks in a naked manner so that the glaze is melted into glass glaze; inspecting, and when burned blanks are qualified, obtaining finished products. The process disclosed by the invention is simple; the prepared crucible is uniform in texture, large in density, low in air hole rates, high in heat conduction, and strong in corrosion resistance; in addition, the clay is used as bonding agents, so that the situation that phenolic resin or tar, as the bonding agents, is decomposed to release harmful smoke in the course of sintering to pollute environment is avoided.

Description

technical field [0001] The invention relates to a crucible for smelting nonferrous metals, in particular to a raw material composition of a graphite-silicon carbide crucible and a manufacturing process thereof. Background technique [0002] Clay-graphite crucibles for smelting non-ferrous metals such as gold, silver, copper, aluminum, zinc and their alloys were produced as early as the 1930s. Press molding, drying, firing, oiling and moisture-proof, use graphite, clay, pyrophyllite clinker, or high-alumina bauxite clinker, elemental silicon powder, or ferrosilicon powder as antioxidants, and mix with water in a certain proportion compared to. Later, part of the silicon carbide was used to replace the high alumina bauxite clinker to improve the quality and enhance the thermal conductivity. The production process of this method is complex, the blank needs to be dried slowly, consumes a lot of energy, the loss of semi-finished products is large, the deformation is large, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/52C04B35/565C04B41/86
Inventor 邢连清刘振友乔徳慧任永曾韩波
Owner QINGDAO BAIDUN CRUCIBLE CO LTD
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