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Technique for preparing ceramic nozzle possessing gradient function for coal water slurry

A preparation process and gradient function technology, which are applied in the preparation process of gradient function ceramic coal-water slurry nozzles, and the nozzle field of coal-water slurry boiler burners, can solve the problems of large thermal stress, low hardness, cracks in coal-water slurry nozzles, etc. , to achieve the effect of improving thermal shock resistance, thermal shock resistance, and service life

Inactive Publication Date: 2005-10-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal and cemented carbide CWS nozzles have lower hardness, poor wear resistance and heat resistance
The hardness, wear resistance and heat resistance of ceramic coal water slurry nozzles are higher than those of metal and cemented carbide, but the thermal shock resistance of ceramic coal water slurry nozzles is poor
Since the outlet end of the coal-water slurry nozzle is placed in the boiler, when the temperature changes, it is easy to generate large thermal stress, which will cause cracks and damage to the coal-water slurry nozzle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: Taking SiC as the matrix, according to the mass percentage of solid solution (W, Ti) C content: 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% Weigh the raw materials and configure 9 kinds of SiC+(W, Ti)C ceramic composite powders with different (W, Ti)C contents; then carry out intensive ball milling respectively, with ethanol as the medium, and the ball milling time is 200 hours; the ball-milled SiC+(W , Ti)C ceramic composite powder is placed in a vacuum drying oven to dry, and after drying, it is sieved in a cabinet with a nitrogen-protected atmosphere; the dried SiC+(W, Ti) of 9 different (W, Ti)C contents C ceramic composite powders were loaded into graphite molds respectively, and the powders were spread layer by layer and pre-compressed in graphite molds in the order that the content of (W, Ti)C solid solution gradually increased from nozzle inlet to outlet. Nitrogen was used as the sintering atmosphere, and the ceramic coal-water slurry nozzle was pr...

Embodiment 2

[0015] Embodiment 2: As described in Embodiment 1, the difference is that 5 kinds of (W, Ti) C contents are configured respectively: 10%, 20%, 30%, 40%, 50% SiC+(W, Ti)C Ceramic composite powder. The sintering temperature is 2000°C, the pressure is 35MPa, and the holding time is 60min.

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PUM

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Abstract

The present invention relates to a gradient function ceramic coal-water slurry nozzle and its preparation method. Said invention uses SiC as base body, and uses (W, Ti) C solid solution as reinforcement phase, and adopts hot-pressing sintering process to prepare the invented gradient function ceramic coal-water slurry nozzle. As compared with general homogeneous aramic coal-water slurry nozzle its nesistance to heat shocks can be obviously raised.

Description

1. Technical field [0001] The invention belongs to the field of advanced manufacturing technology, and relates to a preparation process of a ceramic coal-water slurry nozzle with gradient function, and the nozzle is particularly suitable for a nozzle in a coal-water slurry boiler burner. 2. Background technology [0002] The nozzle is a key component in the coal water slurry burner. The service life of the coal water slurry nozzle depends on the wear resistance and heat resistance of the nozzle, and the service life of the nozzle has a significant impact on the application cost of the coal water slurry. Because coal-water slurry is different from general liquid fuels, it has high concentration, high viscosity, and contains many high-hardness impurities, which will cause serious erosion and wear to the nozzle; in addition, the ambient temperature of the coal-water slurry nozzle is high when the nozzle outlet is There is a very high temperature and a large temperature gradient...

Claims

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Application Information

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IPC IPC(8): C04B35/565
Inventor 邓建新刘莉莉李剑峰丁明伟
Owner SHANDONG UNIV
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