Mixed microwave sintering method of mullite composite material

A composite material and mixed microwave technology, which is applied in the field of mixed microwave sintering of mullite composite materials, can solve problems such as environmental pollution, large energy consumption, and long sintering time, and achieve broad application prospects, energy saving, and short cycle times. Effect

Inactive Publication Date: 2012-05-02
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of long sintering time, large energy consumption and serious environmental pollution in the prior art, the object of the present invention is to provide a hybrid microwave sintering method for mullite composite materials

Method used

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  • Mixed microwave sintering method of mullite composite material
  • Mixed microwave sintering method of mullite composite material
  • Mixed microwave sintering method of mullite composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] like figure 1 and figure 2 As shown, a combined auxiliary heating and heat preservation device, the device includes upper and lower mullite slots 2, inner and outer double mullite plates 51, 52 fixed between the upper and lower mullite slots 2, inner and outer double mullite plates The SiC heating rod 3 between the stone plates 51 and 52 and the mullite cover plate 1 set on the top of the device, the mullite cover plate 1 is provided with an infrared temperature measurement probe hole 4; the inner and outer double-layer mullite plates 51, 52 Fitted with a slot structure, the distance between the inner and outer double-layer mullite plates 51, 52 and the SiC heating rod 3, and between the inner layer mullite plate 51 and the center of the device (where the sample 6 is placed) is 0.4-0.6 cm.

[0029] The raw material is mullite refractory brick body (provided by Henan Dengfeng Hongchang Refractory Co., Ltd.), the main chemical composition is α-mullite, the size is 240mm...

Embodiment 2

[0032] Basically the same as Example 1, the difference is: when the reflected power is basically stable, the heating rate is maintained at 25±3°C / min, the temperature is raised to the sintering temperature of 1000°C at a uniform speed, and the holding time is 5min. The whole sintering process lasted 72min.

[0033] The compressive strength of the obtained mullite sample is 6.14MPa, which is 1.26 times that of the conventional sample; its porosity is 69.0%, water absorption is 82.8%, and the bulk density is 0.85g / cm 3 , which is similar to conventional samples and can meet the requirements of use.

Embodiment 3

[0035] Basically the same as Example 1, the difference is: when the reflected power is basically stable, the heating rate is maintained at 25±3°C / min, the temperature is raised to the sintering temperature at a uniform speed of 1200°C, and the holding time is 10 minutes. The whole sintering process lasted 85min.

[0036] Get the SEM image of the section of the mullite sample magnified 4000 times, see Figure 5 As shown, its compressive strength is 6.53MPa, which is 1.34 times that of conventional samples; its porosity is 68.2%, water absorption is 81.9%, and the bulk density is 0.87g / cm 3 , which is similar to conventional samples and can meet the requirements of use.

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Abstract

The invention belongs to the technical field of a composite material preparation technology and discloses a mixed microwave sintering method of a mullite composite material. The mixed microwave sintering method of the mullite composite material comprises putting a mullite composite material green-pressing into an auxiliary heating-insulation combined device, putting the auxiliary heating-insulation combined device with the mullite composite material green-pressing into a microwave resonant cavity, and carrying out a sintering process, wherein the sintering process comprises the following steps of 1, starting a microwave source, 2, adjusting microwave input power, 3, slowly heating at an average heating rate of 6 to 15 DEG C per minute in a low temperature stage, 4, after humidity elimination and smoke evacuation are finished, continuously adjusting the adjusting input power, 5, fast heating at a heating rate of 2 to 100 DEG C per minute, and simultaneously, monitoring reflection power, 6, when the reflection power is stable, heating to a sintering temperature of 1000 to 1500 DEG C at a heating rate of 20 to 30 DEG C per minute, 7, keeping the sintering temperature for 2 to 10 minutes, and 8, cooling to room temperature in a furnace to obtain the mullite composite material. The mixed microwave sintering method of the mullite composite material combines a traditional sintering technology and a microwave sintering technology according to microwave adsorption properties of an oxide, and realizes fast sintering of the mullite composite material.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation technology, and relates to a mixed microwave sintering method of mullite composite material. Background technique [0002] Mullite is an aluminosilicate mineral with high refractoriness, good thermal shock resistance, chemical corrosion resistance, creep resistance, high load softening temperature, good volume stability, and strong electrical insulation. It is an ideal Advanced refractory materials are widely used in chemical industry, metallurgy, environmental protection and other fields, and have great social and economic significance. [0003] At present, the preparation of mullite mainly relies on the traditional sintering method, which takes a long time and consumes a lot of energy, and the CO produced by the sintering process 2 Emissions and high-temperature radiation have serious impacts on the environment. As an emerging alternative sintering technology, microwave ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/185
Inventor 张锐王海龙范冰冰张帆陈德良李旭勤陈浩关莉郭晓琴
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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