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Corrosion-resistant silicon carbide wear-resistant plastic material

A silicon carbide and anti-corrosion technology, applied in the field of unshaped refractory materials, can solve the problems of inability to meet the requirements of circulating fluidized bed boilers, low compressive strength and flexural strength, and large linear change rate, and improve the bulk density. and high temperature performance, high compressive strength and flexural strength, and small linear change rate

Inactive Publication Date: 2013-09-25
YIXING XINGBEI REFRACTORIES PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of binder used in this type of plastic can reach 14-16%, the compressive strength and flexural strength are low, the linear change rate is large, and the wear resistance is poor, so it cannot meet the long-term use of circulating fluidized bed boilers under harsh working conditions Require

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A kind of corrosion-resistant silicon carbide wear-resistant plastic, the raw material is: Al 2 o 3 ≥88% high-alumina bauxite clinker 78%, purity 98% silicon carbide 10%, particle size ≤2μm alumina micropowder 4%, chromium oxide 2%, purity 94% silica fume 4%, metal silicon powder 2%.

[0013] First mix the high-alumina bauxite clinker and silicon carbide in the above raw materials into aggregates, and then add 3% aluminum dihydrogen phosphate by the weight of the raw materials to trap in the aggregates; after the trapping is completed, add 9% phosphoric acid by the weight of the raw materials Aluminum dihydrogen and 2% aluminate cement.

[0014] The use temperature of this kind of plastic is 1500°C, the bulk density is 2.8-2.9g / cm3, after 24h test at 110°C, the compressive strength is ≥90MPa, after 3h test at 1100°C, the compressive strength is ≥120MPa, the resistance Abrasiveness ≤ 4 cm3, linear change rate ≤ -0.3%, this kind of anti-corrosion silicon carbide wear-re...

Embodiment 2

[0016] A kind of corrosion-resistant silicon carbide wear-resistant plastic, its composition percentage is as follows: Al 2 o 3 ≥88% high alumina bauxite clinker 70%, purity 98% silicon carbide 13%, particle size ≤2μm alumina micropowder 6%, chromium oxide 3%, purity 94% silica fume 5%, metal silicon powder 3%.

[0017] First mix the high-alumina bauxite clinker and silicon carbide into aggregates, then add 1.6% of the weight of the raw materials to trap phosphoric acid in the aggregates; then add 6% of the weight of the raw materials to aluminum dihydrogen phosphate, 1 % calcium aluminate cement.

[0018] This kind of plastic can be used at a temperature of 1550°C, with a bulk density of 2.8-2.9g / cm3, tested at 110°C for 24 hours, with a compressive strength ≥ 100MPa, and tested at 1100°C for 3 hours, with a compressive strength ≥ 130MPa, wear-resistant Property ≤ 4 cm3, linear change rate ≤ -0.3%, this kind of corrosion-resistant silicon carbide wear-resistant plastic can ...

Embodiment 3

[0020] A kind of anti-corrosion silicon carbide wear-resistant plastic, its composition percentage is as follows: fused white corundum 72%, purity 98% silicon carbide 15%, particle size ≤ 2μm alumina micropowder 4.5%, chromium oxide 2.5%, purity 94% micro Silicon powder 4%, metal silicon powder 2%.

[0021] First mix the fused white corundum and silicon carbide in the above raw materials to form aggregates, then add 3% aluminum dihydrogen phosphate by weight of the raw materials to trap in the aggregates; after the trapping is completed, add 11% dihydrogen phosphate by weight of raw materials Aluminum and 2% aluminate cement.

[0022] This kind of plastic can be used at a temperature of 1600°C, with a bulk density of 2.9-3.0g / cm3, tested at 110°C for 24 hours, and its compressive strength is ≥100MPa, and tested at 1100°C for 3 hours, its compressive strength is ≥140MPa, wear-resistant Property ≤4 cm3, linear change rate ≤-0.3%, this corrosion-resistant silicon carbide wear-re...

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Abstract

The invention relates to an amorphous refractory material, and particularly relates to a corrosion-resistant silicon carbide wear-resistant plastic material applicable to the poor operating environment parts of garbage incinerators and circulating fluidized beds and the like. The plastic material is prepared from the following raw materials in percentage by mass: 70-78% of high-alumina aggregates, 10-15% of 98% silicon carbide, 4-6% of alumina micro-powder with the particle size of less than or equal to 2 mu m, 2-3% of chrome oxide, 4-5% of 94% micro silicon powder, and 2-3% of silicon metal powder. The corrosion-resistant silicon carbide wear-resistant plastic material provided by the invention is high in compression strength and rupture strength, small in line change rate and strong in wear resistance, and can satisfy the application requirements of circulating fluidized bed boilers under harsh working conditions for a long time.

Description

technical field [0001] The invention relates to an unshaped refractory material, in particular to an anti-corrosion silicon carbide wear-resistant plastic suitable for parts with harsh operating environments such as garbage incinerators and circulating fluidized beds. Background technique [0002] At present, due to the low-quality coal used in the combustion of circulating fluidized bed boilers, the proportion of coal gangue is large, resulting in serious wear and tear on the water wall, coal drop, cyclone separator, and anti-wear beams. Corrosion resistance, wear resistance and thermal shock of materials put forward higher requirements. The existing wear-resistant and refractory plastics mainly use high-alumina bauxite clinker and micro-silica fume or clay as raw materials, and aluminum dihydrogen phosphate or aluminum sulfate as binders. The amount of binder used in this type of plastic can reach 14-16%, the compressive strength and flexural strength are low, the linear ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/565
Inventor 王晓杰张卫星许英常伟峰张晟李业清
Owner YIXING XINGBEI REFRACTORIES PROD
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