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Microwave sintering method for SiC ceramic roller

A ceramic roller and microwave sintering technology, applied in the field of SiC ceramics, can solve the problems of easy overburning of the flame port, long normal pressure sintering time of silicon carbide ceramic rollers, uneven sintering of materials, etc., achieving short sintering time and solving problems. The effect of long atmospheric sintering time, improved uniformity and stability

Active Publication Date: 2014-03-12
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a microwave sintering method for SiC ceramic rollers, which solves the problems of long sintering time of silicon carbide ceramic rollers under normal pressure, uneven sintering of materials, and over-burning phenomenon at the flame mouth

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  • Microwave sintering method for SiC ceramic roller
  • Microwave sintering method for SiC ceramic roller
  • Microwave sintering method for SiC ceramic roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The microwave sintering method of the SiC ceramic roller rod of the present embodiment comprises the following steps:

[0033] 1) Put the SiC ceramic roller green body into the heat preservation device, and then place it together with the heat preservation device in the microwave resonant cavity; the function of the heat preservation device is to ensure the uniform temperature distribution of the roller during the sintering process; The billet is provided by Foshan Ceramics Research Institute with a length of 1220mm, an outer diameter of 62mm, and an inner diameter of 56mm. There is an axially hollow SiC ceramic roller rod, which is made of alumina, silicon carbide, and clay. It is prepared by compression molding and 260MPa cold isostatic pressing; the weight ratio of alumina, silicon carbide and clay is 29:55:13.

[0034] 2) Turn on the microwave source, adjust the microwave input frequency, raise the temperature at a rate of 6°C / min in the low temperature stage to the...

Embodiment 2

[0038] The microwave sintering method of the SiC ceramic roller rod of the present embodiment comprises the following steps:

[0039] 1) Put the SiC ceramic roller green body into the heat preservation device, and then place it together with the heat preservation device in the microwave resonant cavity; the function of the heat preservation device is to ensure the uniform temperature distribution of the roller during the sintering process; The billet is provided by Foshan Ceramic Research Institute with a length of 1000mm, an outer diameter of 50mm, and an inner diameter of 45mm. There is an axially hollow SiC ceramic roller rod, which is made of alumina, silicon carbide, and clay. It is prepared by pressing and 260MPa cold isostatic pressing; the weight ratio of alumina, silicon carbide and clay is 30:35:10.

[0040] 2) Turn on the microwave source, adjust the microwave input frequency, raise the temperature at a rate of 15°C / min in the low temperature stage to the end of moi...

Embodiment 3

[0042] The microwave sintering method of the SiC ceramic roller rod of the present embodiment comprises the following steps:

[0043] 1) Put the SiC ceramic roller green body into the heat preservation device, and then place it together with the heat preservation device in the microwave resonant cavity; the function of the heat preservation device is to ensure the uniform temperature distribution of the roller during the sintering process; The billet is provided by the Foshan Ceramic Research Institute with a length of 1160mm, an outer diameter of 55mm, and an inner diameter of 50mm. There is an axially hollow SiC ceramic roller rod, which is made of alumina, silicon carbide, and clay. It is prepared by pressing; the weight ratio of alumina, silicon carbide and clay is 33:45:15.

[0044] 2) Turn on the microwave source, adjust the microwave input frequency, raise the temperature at a rate of 10°C / min in the low temperature stage until the end of dehumidification and smoke exha...

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Abstract

The invention discloses a microwave sintering method for a SiC ceramic roller. The microwave sintering method comprises the following steps: 1) putting a green SiC ceramic roller body in an insulation apparatus and then placing the green SiC ceramic roller body and the insulation apparatus into a microwave resonant cavity together; and 2) starting a microwave source, adjusting microwave input frequency, carrying out slow heating until humidity elimination and smoke evacuation is finished, then continuously adjusting microwave input frequency, carrying out rapid heating until reflection power is stable, carrying out heating at a heating speed of 20 to 30 DEG C / min to a sintering temperature, maintaining the temperature for 5 to 15 min, then adjusting microwave input frequency and carrying out cooling to room temperature so as to obtain the SiC ceramic roller. The microwave sintering method for the SiC ceramic roller realizes rapid sintering of the SiC ceramic roller, substantially improves uniformity and stability of the performances of a sintered material, effectively avoids the phenomenon of local surface warping of a roller at a fire hole frequently occurred during conventional sintering, improves sintering yield of the SiC ceramic roller and has the advantages of short sintering time, conservation of considerable electric energy and suitability for industrial rapid production.

Description

technical field [0001] The invention belongs to the technical field of SiC ceramics, and in particular relates to a microwave sintering method for SiC ceramic roller rods. Background technique [0002] Ceramic rollers, as a kind of refractory kiln furniture, play the role of supporting and conveying ceramic bodies and products in the roller firing kiln and roller drying kiln, and are the core components of the roller kiln. Silicon carbide ceramics are generally used as high-temperature and medium-high temperature rollers because of their high strength, good thermal shock resistance, and good high-temperature creep resistance. [0003] At present, the methods for preparing high-density SiC ceramics mainly include atmospheric pressure sintering, hot pressing sintering, hot isostatic pressing sintering and reaction sintering. Among them, the hot pressing sintering process can only produce SiC parts with simple shapes, and the number of products prepared in one hot sintering pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/565
Inventor 范冰冰张帆张逸人王海龙张锐骈小璇陈浩陈德良卢红霞许红亮杨道媛陈勇强
Owner ZHENGZHOU UNIV
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