Coating for liquid lifting pipe made of silicon nitride combined with silicon carbide and preparation method of coating

A silicon carbide ceramic and liquid riser technology, applied in the field of refractory materials, can solve the problems of high price, complex process, expensive materials, etc., and achieve the effects of low cost, good bonding performance and simple preparation

Active Publication Date: 2017-05-10
HANJIANG HONGYUAN XIANGYANG SILICON CARBIDE SPECIAL CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to add expensive rare earth metals to the core layer, and it needs to be sintered at a high temperature of 1700-1800 ° C. The mat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment includes the following steps:

[0055] Step 1: Preparation of anti-oxidation layer:

[0056] 1) Treat the inner and outer walls of the silicon nitride bonded silicon carbide ceramic riser:

[0057] Grinding and cleaning the inner and outer walls of the silicon nitride bonded silicon carbide ceramic riser.

[0058] 2) Preparation of anti-oxidation layer slurry:

[0059] Pass silicon carbide micropowder, boron nitride, yttrium-stabilized zirconia, high alumina cement and sodium hexametaphosphate through a 200-mesh sieve respectively, then weigh 25 parts by mass of silicon carbide micropowder, 3 parts by mass of boron oxide, and 4 parts by mass of yttrium-stabilized zirconia. Parts by mass, 5 parts by mass of high alumina cement, 1 part by mass of sodium hexametaphosphate, ball milled for 2h, then add 4 parts by mass of silica sol with a mass concentration of 20%, and 40 parts by mass of aluminum dihydrogen phosphate with a mass concentration of 20%, at r...

Embodiment 2

[0072] This embodiment includes the following steps:

[0073] Step 1: Preparation of anti-oxidation layer:

[0074] 1) Treatment of the inner and outer walls of the silicon nitride bonded silicon carbide ceramic riser:

[0075] Grinding and cleaning the inner and outer walls of the silicon nitride and silicon carbide ceramic riser;

[0076] 2) Preparation of anti-oxidation layer slurry:

[0077] Pass silicon carbide micropowder, boron nitride, yttrium-stabilized zirconia, high alumina cement and sodium hexametaphosphate through a 200-mesh sieve respectively, then weigh 28 parts by mass of silicon carbide micropowder, 5 parts by mass of boron oxide, and 4 parts by mass of yttrium-stabilized zirconia. Parts by mass, 7 parts by mass of high alumina cement, 1 part by mass of sodium hexametaphosphate, ball milled for 2 hours, then added 5 parts by mass of silica sol with a mass concentration of 30%, and 45 parts by mass of aluminum dihydrogen phosphate with a mass concentration o...

Embodiment 3

[0090] This embodiment includes the following steps:

[0091] Step 1: Preparation of anti-oxidation layer:

[0092] 1) Treatment of the inner and outer walls of the silicon nitride bonded silicon carbide ceramic riser:

[0093] Grinding and cleaning the inner and outer walls of the silicon nitride and silicon carbide ceramic riser;

[0094] 2) Preparation of anti-oxidation layer slurry:

[0095] Pass silicon carbide micropowder, boron nitride, yttrium-stabilized zirconia, high alumina cement and sodium hexametaphosphate through a 200-mesh sieve respectively, then weigh 33 parts by mass of silicon carbide micropowder, 6 parts by mass of boron oxide, and 6 parts by mass of yttrium-stabilized zirconia. Parts by mass, 9 parts by mass of high alumina cement, 2 parts by mass of sodium hexametaphosphate, ball milled for 3h, then added 7 parts by mass of silica sol with a mass concentration of 50%, 50 parts by mass of aluminum dihydrogen phosphate with a mass concentration of 50%, a...

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Abstract

The invention provides a coating for a liquid lifting pipe made of silicon nitride combined with silicon carbide and a preparation method of the coating. Each of the inner wall and the outer wall of the liquid lifting pipe is coated with an anti-oxidation layer, the anti-oxidation layer on the inner wall is coated with an anti-aluminum-adhesion layer, each anti-oxidation layer comprises silicon carbide micropowder, boron oxide, yttria-stabilized zirconia, high-alumina cement, sodium hexametaphosphate, silica sol and aluminum dihydrogen phosphate, and the anti-aluminum-adhesion layer comprises boron nitride, talcum powder, aluminum triphosphate, silica sol and aluminum dihydrogen phosphate. The coating is low in material cost, a low-temperature forming method is adopted during preparation, and high-temperature sintering is not needed, so that process difficulty and production cost are lowered greatly; by arranging the coating, excellent thermal shock resistance of the liquid lifting pipe is guaranteed, the liquid lifting pipe has good anti-oxidation and anti-aluminum-adhesion effects, service life of the liquid lifting pipe is prolonged, time interval for cleaning aluminum adhered on the inner wall is prolonged, and using cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, in particular to a silicon nitride-bonded silicon carbide ceramic liquid riser coating and a preparation method thereof. Background technique [0002] The riser tube is one of the key components of the aluminum alloy die-casting machine, which is used to introduce the liquid metal into the mold pipe from bottom to top, and plays the role of diversion and feeding. When the liquid riser is working, the lower end is placed in a closed holding furnace, and the upper end is connected to the mold cavity of the low-pressure casting machine. The molten metal aluminum rises into the mold cavity through pressure to complete periodic casting. Therefore, the riser pipe is required to have good high temperature resistance, thermal shock resistance and corrosion resistance of molten aluminum. [0003] The materials of the riser in the prior art include cast iron, aluminum titanate ceramics or sil...

Claims

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Application Information

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IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/565C04B35/584C04B41/5064C04B41/5042C04B41/508C04B41/5015C04B41/5035C04B41/5024
Inventor 李秋南刘凯王惠民赵光华赵红飞黄涛崔超阳阳白梅赵涛
Owner HANJIANG HONGYUAN XIANGYANG SILICON CARBIDE SPECIAL CERAMICS
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