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High temperature wearable silicon nitride ceramic material and its production method

A technology of silicon carbide ceramics and production methods, applied in the field of refractory materials, can solve the problems of inconvenient replacement, heavy weight, and large volume, and achieve the effects of excellent product performance, light weight, and small volume

Inactive Publication Date: 2008-11-26
郑州华泰节能陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the uniform fluid and slag discharge heads used in domestic thermal power plant boilers are cast steel products, which have the disadvantages of large volume and heavy weight during use, and are expensive, short in life, and inconvenient to replace.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Production method of high-temperature, wear-resistant silicon carbide ceramic homogeneous fluid and slag discharge head

[0025] 1. Material selection

[0026] Purchase materials according to the formula requirements, and the particle size distribution of each material should be uniform. Such as 1-5um material, the distribution curve from the 1um-5um mixture should be uniform, and the phenomenon of too high and too low is not allowed.

[0027] 2. Raw material inspection

[0028] Silicon carbide powder performance requirements: SiC: 99.9, FC: 0.01, SiO 2 : 0.03, Al 2 o 3 : 0.02,

[0029] Natural bulk density: 1.5g / cm 3 , Sieving coarse material 150um, 90% screening rate.

[0030] 3. After the raw materials pass the inspection, a small amount of ingredients, mixing, and pouring are carried out in the laboratory. At the same time, the viscosity of the slurry is required to reach 500-600Pa, and the density is 2.6-2.63g / cm 3 ; It is required that the slurr...

Embodiment 2

[0043] Embodiment 2: The production method of high-temperature, wear-resistant silicon carbide ceramic homogeneous fluid and slag discharge head is basically the same as Embodiment 1, and the similarities will not be described again. The differences are:

[0044] 1. Formula

[0045] The raw materials are 28 parts of silicon carbide powder with a particle size of 0-1um, 24 parts of 1-5um, 27 parts of 10-63um, 20 parts of 125-150um, and 3 parts of rare earth yttrium;

[0046] Divide into 3 batches of mixing, after the raw material is put in, take out the air of the mixing machine with a vacuum pump, mix the materials for 30 hours under a vacuum degree of 5 Pa, add water to adjust the viscosity of the slurry to 600 poise.

[0047] 2. Green body drying and trimming

[0048] Place the casted semi-finished green body for 3 hours and then demould it. Dry the demoulded green body in a drying room at 80°C for one day and then take it out, then repair and process the green body, and pu...

Embodiment 3

[0051] Embodiment three: the production method of high-temperature, wear-resistant silicon carbide ceramic homogeneous fluid and slag discharge head is basically the same as embodiment one, and the similarities will not be described again. The differences are:

[0052] 1. Formula: The raw materials are 22 parts of silicon carbide powder with a particle size of 0-1um, 27 parts of 1-5um, 26 parts of 10-63um, 23 parts of 125-150um, and 4 parts of rare earth yttrium.

[0053] Put into the mixture in 4 times, after the raw materials are put in, take out the air of the mixer with a vacuum pump, mix the materials for 25 hours under a vacuum of 4Pa, add water to adjust the viscosity of the slurry to 550 poises;

[0054] 2. Firing

[0055] When firing, the green body is supported by a fired graphite material rack, and the power is transmitted and heated in a vacuum state. The heating rate is 4°C / min, and the vacuum degree is 2Pa when the temperature rises before 1100°C. After the tempe...

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PUM

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Abstract

The invention relates the fireproof material, especially the high temperature abrasion-proof carbide ceramics material and preparing method. The method comprises the following steps: mixing the four kinds of silicon carbides which are 0-150 mum, adding water, then adding 1-5% rare earth, pulping, injection molding, drying, caking at 2425-2550Deg.C, and getting high temperature abrasion-proof carbide ceramics material. The product made with the material has the advantages of small volume, light weight, long lifetime and convenient usage; after drying, high-sintering, getting carbonization recrystallization product whose compression strength is 110MPa and volume density is 2.7g / cm3, and getting the ceramic products which is high-temperature resistance, corrosion resistance, wear-resisting, bruise resistance and anti-chattering.

Description

1. Technical field: [0001] The invention relates to a refractory material, in particular to a high-temperature, wear-resistant silicon carbide ceramic ceramic material and a production method thereof. 2. Background technology: [0002] At present, the uniform fluid and slag discharge heads used in domestic thermal power plant boilers are cast steel products, which have the disadvantages of large volume and heavy weight during use, and are expensive, short in life, and inconvenient to replace. The homogenizers and slag discharge heads used in foreign thermal power plant boilers are all engineering ceramic products, while in China they are all cast steel products, and most of them are imported. Since silicon carbide ceramic materials have good high-temperature mechanical properties, high-temperature oxidation resistance, acid-base corrosion resistance, and wear resistance, using this material to make uniform fluid and slag discharge heads for boilers that are in short supply i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 苏建林王灿光
Owner 郑州华泰节能陶瓷有限公司
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