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Chromium oxide material sintering process

A sintering method and technology of chromium oxide, which is applied in the field of sintering of chromium oxide materials, can solve the problems of high production cost, difficult process control, and high equipment requirements, and achieve the effects of good surface quality, simple process control, and energy saving

Inactive Publication Date: 2005-03-02
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the principle that this method requires the firing process to be in an absolutely sealed high-temperature furnace, otherwise it will be difficult to succeed. Therefore, the process control is difficult, the equipment requirements are high, and the production cost is also high.

Method used

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  • Chromium oxide material sintering process
  • Chromium oxide material sintering process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: sample 4 is made of pure Cr 2 o 3 The material is pressed and molded, and its surface is covered with a chromium oxide fine powder layer 3 with a thickness of 1 cm. The carbon powder 2 mixed with graphite powder and coke powder is buried outside the chromium oxide fine powder layer. The content of graphite and coke powder is calculated by weight. Each accounted for 50%, put into corundum quality saggar 1, and keep warm at 1550°C for 1 hour. Comparative Example 1 is the same sample fired at 1800°C for 3 hours under oxidative atmosphere (air) conditions. The relative density and apparent porosity among them are compared in Table 1.

[0021] Relative density(%)

Embodiment 2

[0022] Embodiment 2: The sample is made of high Cr 2 o 3 Composite material is pressed, and its raw material components are by weight: Cr 2 o 3 86%, ZrO 2 6%, Al 2 o 3 8%, cover the sample with a chromium oxide layer with a thickness of 1cm, and then cover with graphite powder, put it in a sagger, and keep it warm at 1550°C for 1 hour. In Comparative Example 2, the same sample was fired at 1650°C for 3 hours under air conditions. The relative density comparison between them is shown in Table 2.

[0023] Relative density(%)

Embodiment 3

[0024] Embodiment 3: sample is made of pure Cr 2 o 3 Pressed and formed, the surface is covered with a white corundum layer with a thickness of 1cm, and carbon powder is buried outside the white corundum layer, put into a sagger and fired at 1550°C for 1 hour, and its relative density can reach 92%.

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Abstract

During the sintering of chromium oxide material, the chromium oxide material is covered with composite covering agent including one layer of fine oxide powder and one layer of carbon powder, the sintering is completed in some case at 1500-1650 deg.c with the temperature maintaining period being 1-3 hr. The process can sinter chromium oxide completely and has the advantages of high surface quality of the sintered product and high density owing to the isolation of the oxide layer to separate the chromium oxide material from the outer carbon powder; low power consumption and long sintering equipment service life owing to the low temperature sintering; and simple technological process.

Description

technical field [0001] The invention relates to a low-temperature synthesis of pure Cr without reaction layer by using a composite covering agent 2 o 3 and high Cr 2 o 3 The sintering method of the material. Background technique [0002] There are many types of high chromium refractory materials, which are widely used. Among these materials, Cr 2 o 3 -ZrO 2 -Al 2 o 3 The research and development of materials has attracted much attention. Pure Cr 2 o 3 and high Cr 2 o 3 The material is mainly used in the non-alkali glass kiln in the glass industry and the coal-water slurry gasifier in the chemical industry. as the thermal face material for its lining. Since the gasification of coal is a reaction under high temperature and high pressure, this material must not only be resistant to high temperature, but also be able to resist slag (containing SiO 2 、Al 2 o 3 , MgO, etc.) erosion. Theoretical analysis and experiments prove that high Cr 2 o 3 The content is n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/12C04B35/64C04B35/66
Inventor 梁永和孙承绪李楠钱新伟吴芸芸
Owner WUHAN UNIV OF SCI & TECH