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SiC-Si3N4 high temperature ceramic furnace bottom plate for annular furnace and preparation method thereof

A technology of sic-si3n4 and high-temperature ceramics, applied in the field of high-temperature ceramics, can solve problems such as cracking and damage to the furnace bottom plate, bending deformation of the furnace bottom plate, and poor high-temperature resistance, and achieve low cost, good creep resistance, and heat resistance. good shock effect

Inactive Publication Date: 2012-11-28
湖北红花高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the steel furnace floor of the existing annular furnace, and the purpose is to provide a SiC-Si for annular furnace with simple process and good performance. 3 N 4 The preparation technology of the high-quality high-temperature ceramic furnace bottom plate, the high-temperature ceramic furnace bottom plate prepared by this technology has high temperature resistance, good creep resistance, high temperature strength, and good thermal shock resistance, which can effectively solve the problem of poor high temperature resistance of the metal furnace bottom plate. The high temperature creep rate of the material causes bending deformation of the furnace bottom plate, and the high thermal expansion rate of the material causes cracking damage of the furnace bottom plate and low service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh 63kg of SiC powder, 37kg of Si powder, 3kg of Y 2 o 3 And 4kg phenolic resin, mix and grind into mud in the mixer mill. The mud material is put into the mold, and the furnace bottom slab is formed by conventional ramming molding method.

[0039] The slab was kept at 1270° C. for 30 hours under a nitrogen atmosphere, and then continued to heat up to 1700° C. under a nitrogen atmosphere, and held for 3 hours to obtain a nitrided sintered billet.

[0040]The nitrided sintered compact was impregnated with silicon at 1800°C and 30 Pa vacuum for 15 hours to obtain a furnace floor blank. Machining the blank to produce SiC-Si for ring furnace 3 N 4 High-quality high-temperature ceramic furnace bottom plate.

Embodiment 2

[0042] Weigh SiC powder 55kg, Si powder 45kg, 4kgY 2 o 3 And 6kg phenolic resin, as embodiment 1 mixes and grinds base.

[0043] The slab was kept at 1430° C. for 5 hours under a nitrogen atmosphere, and then continued to heat up to 1650° C. under a nitrogen atmosphere for 8 hours to prepare a nitrided sintered billet.

[0044] The nitrided sintered compact was impregnated with silicon at 1850°C and 60 Pa vacuum for 20 hours to obtain a furnace floor blank. Machining the blank to produce SiC-Si for ring furnace 3 N 4 High-quality high-temperature ceramic furnace bottom plate.

Embodiment 3

[0046] Weigh SiC powder 75kg, Si powder 25kg, 8kgY 2 o 3 And 9kg colloidal silica, as embodiment 1 mixes and grinds compact.

[0047] The slab was kept at 1430° C. for 5 hours under a nitrogen atmosphere, and then continued to heat up to 1650° C. under a nitrogen atmosphere for 8 hours to prepare a nitrided sintered billet.

[0048] The nitrided sintered compact was impregnated with silicon at 1850°C and 60 Pa vacuum for 20 hours to obtain a furnace floor blank. Machining the blank to produce SiC-Si for ring furnace 3 N 4 High-quality high-temperature ceramic furnace bottom plate.

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Abstract

The invention relates to a SiC-Si3N4 high temperature ceramic furnace bottom plate for an annular furnace and a preparation method thereof; the preparation method comprises the following steps: on a basis of a total weight part of 100 parts, weighing 25-75 parts of Si powder and the balance of SiC powder; adding 3-8 parts of a sintering aid and 4-9 parts of a binder, wherein the sintering aid is Y2O3, or a mixture of Y2O3 and Al2O3; performing material mixing, molding, sintering, silicon immersion, and machining to prepare the SiC-Si3N4 high temperature ceramic furnace bottom plate for an annular furnace. The preparation method is simple in process and low in cost, and the obtained product has the characteristics of high temperature resistance, good creep resistance, large high-temperature strength, good thermal shock resistance, and the like, can meet working condition requirements for annular furnace production, and can effectively solve the problems of poor high temperature resistance of metal furnace bottom plates, furnace bottom plate bending deformation due to a large material high-temperature creep rate, furnace bottom plate cracking damage due to a large material thermal expansion rate, and low service life.

Description

technical field [0001] The invention belongs to the technical field of high-temperature ceramics, and in particular relates to a SiC-Si 3 N 4 A high-quality high-temperature ceramic furnace bottom plate and a preparation method thereof. Background technique [0002] In the annular furnaces of metallurgical and machinery manufacturing plants, it is usually necessary to use a large number of heat-resistant steel furnace bottom plates to carry steel coils and steel parts for thermal processing production. Existing annular furnace bottom plates are generally made of superalloy materials. For example, metal furnace bottom plates are made under high temperature and load conditions above 950°C or even over 1000°C for a long time. The high temperature resistance of the high temperature alloy materials obtained is Especially high temperature strength and creep resistance may not be able to meet the requirements of actual working conditions. This is because the high-temperature cre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/584C04B35/622
Inventor 祝洪喜骆中汉邓承继汪盛明张小东彭玮珂程明
Owner 湖北红花高温材料股份有限公司
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