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Silicon nitride composite ceramic lift tube for low-pressure casting and preparation method thereof

A composite ceramic and low pressure casting technology, which is applied in the field of silicon nitride composite ceramic liquid riser for low pressure casting and its preparation, can solve the problem of poor oxidation resistance and corrosion resistance of aluminum liquid, affecting thermal vibration resistance and air tightness, and production cost. And the problems of high maintenance cost, to achieve the effect of improving product cost performance, high strength and air tightness, and reducing adhesion and accumulation

Inactive Publication Date: 2014-02-19
ZIBO GUIYUAN TAISHENG ADVANCED CERAMIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metal riser has better air tightness, poor oxidation resistance and corrosion resistance of molten aluminum, more impurities and adhesion scaling, seriously affecting the quality of castings, shorter service life, restricting continuous production, and higher production and maintenance costs ;Quartz ceramic riser, aluminum titanate ceramic riser, silicon carbide composite ceramic riser, etc. replace metal riser, which has better oxidation resistance and corrosion resistance, but lower strength and higher apparent porosity It directly affects the thermal shock resistance and air tightness, and the service life exceeds the metal riser, generally 10-45 days. The phenomenon of non-ferrous metal solution slag sticking to the build-up is not much improved, and the maintenance cost is high

Method used

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  • Silicon nitride composite ceramic lift tube for low-pressure casting and preparation method thereof
  • Silicon nitride composite ceramic lift tube for low-pressure casting and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Put 300 kg of silicon nitride, 12 kg of iridium oxide, 22 kg of aluminum oxide, 10 kg of magnesium oxide, 2 kg of tungsten carbide, 720 kg of silicon nitride grinding balls, and 280 kg of deionized water into the sand mill, Ball milled for 108 hours to obtain mixed homogeneous slurry, the slurry concentration was 55.3%, and the average particle size of the raw material particles in the slurry was 0.78 μm;

[0034] (2) Pour the slurry in step (1) into the mixing tank, add 8.5 kg of polyvinyl alcohol 1788, stir for 2 hours and then perform dry atomization treatment. The dry atomization temperature is 120°C, and the dry atomization time is 4 hours. A granulated raw material powder with an average particle size of 50 μm and a moisture content of 0.15% was obtained;

[0035] (3) The raw material powder for granulation in step (2) is processed by cold isostatic pressing equipment, the cold isostatic pressing pressure is 150MPa, and the holding time is 10 minutes, and the ...

Embodiment 2

[0040] (1) Put 300 kg of silicon nitride, 11 kg of iridium oxide, 24 kg of aluminum oxide, 9 kg of magnesium oxide, 3 kg of tungsten carbide, 750 kg of silicon nitride grinding balls, and 240 kg of deionized water into the sand mill, Ball milled for 115 hours to obtain mixed homogeneous slurry, the slurry concentration was 59%, and the average particle size of the raw material particles in the slurry was 0.75 μm;

[0041] (2) Pour the slurry in step (1) into the mixing tank, add 9 kg of polyvinyl alcohol 1799, stir for 2.5 hours and then perform dry atomization treatment. The dry atomization temperature is 160°C, and the dry atomization time is 4 hours. A granulated raw material powder with an average particle size of 150 μm and a moisture content of 0.25% was obtained;

[0042] (3) The raw material powder for granulation in step (2) is processed by cold isostatic pressing equipment, the pressure of cold isostatic pressing is 240 MPa, and the holding time is 15 minutes, and th...

Embodiment 3

[0047] (1) Put 300 kg of silicon nitride, 14 kg of iridium oxide, 26 kg of aluminum oxide, 8 kg of magnesium oxide, 4 kg of tungsten carbide, 800 kg of silicon nitride grinding balls, and 220 kg of deionized water into the sand mill, Ball milling for 120 hours to obtain mixed homogeneous slurry, the slurry concentration is 61%, and the average particle size of the raw material particles in the slurry is 0.6 μm;

[0048](2) Pour the slurry in step (1) into the mixing tank, add 9 kg of polyvinyl alcohol 1788, stir for 3 hours and then perform dry atomization treatment. The dry atomization temperature is 130°C, and the dry atomization time is 3 hours. A granulated raw material powder with an average particle size of 100 μm and a moisture content of 0.2% was obtained;

[0049] (3) The raw material powder for granulation in step (2) is processed by cold isostatic pressing equipment, the pressure of cold isostatic pressing is 200 MPa, and the holding time is 12 minutes, and the gree...

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Abstract

The invention belongs to the field of preparation of a ceramic material, and particularly relates to a silicon nitride composite ceramic lift tube for low-pressure casting and a preparation method thereof. The silicon nitride composite ceramic lift tube is prepared from the following raw materials by weight percent: 82-87% of silicon nitride, 2-7% of iridium oxide, 5-10% of aluminum oxide, 1.5-3% of magnesium oxide, and 0.5-1.8% of tungsten carbide. The method comprises the following steps: carrying out ball-milling on raw materials, grinding medium and deionized water to obtain mixed homogeneous slurry; carrying out drying atomization treatment after adding polyvinyl alcohol to stir; carrying out cold isostatic pressing blank forming, sintering the blank by air pressure after drying treatment; carrying out surface mechanical grinding processing, so as to obtain the silicon nitride composite ceramic lift tube. The silicon nitride composite ceramic lift tube has excellent thermal shock resistance, excellent inoxidizability and corrosion resistance, high strength and air-tightness, and excellent gelling and scaling resistance, and has the service life of 6-12 months; long-term high-efficiency operation of low-pressure casting is ensured; meanwhile, the preparation technology is optimized; the operation cost and the maintenance cost of low-pressure casting equipment are greatly reduced.

Description

technical field [0001] The invention belongs to the field of ceramic material preparation, and in particular relates to a silicon nitride composite ceramic liquid riser for low-pressure casting and a preparation method thereof. Background technique [0002] The riser tube is a key component widely used in low-pressure casting equipment in the field of non-ferrous metal smelting and casting. It realizes lifting the non-ferrous metal solution from the smelting equipment to the mold cavity through low pressure for casting. It is an important part of low-pressure casting that affects continuous production. Therefore, the low-pressure casting technology requires that the riser should have excellent thermal shock resistance, excellent oxidation and corrosion resistance, high strength, high sealing performance, anti-adhesion and scaling and other excellent properties. [0003] At present, the domestic low-pressure casting riser material is mainly divided into: metal riser, quartz c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/593C04B35/596C04B35/622
Inventor 刘彤孙兆江孙百忠
Owner ZIBO GUIYUAN TAISHENG ADVANCED CERAMIC
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