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Low carbon magnesium carbon brick containing B4C-C composite powder and nano TiC powder, and method of manufacturing the same

A B4C-C, composite powder technology, applied in the field of low-carbon magnesia-carbon brick refractory materials, can solve the problems of high cost and unfavorable material performance, and achieve the effect of low cost, good anti-oxidation effect and high temperature strength

Inactive Publication Date: 2012-03-21
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the synthesis of TiN is through N 2 In the atmosphere, the cost is relatively high; and in the use of the atmosphere, TiN will be combined with CO and N 2 The reaction produces precipitation, which is detrimental to the material properties
[0006] "A magnesia-carbon brick containing titanium carbonitride and its preparation method" (publication number: CN1944346A) introduces the use of titanium carbonitride to improve the performance of magnesia-carbon bricks, but the synthesis of titanium carbonitride is carried out through N 2 Under the atmosphere, the cost is also relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] a B 4 C-C composite powder and nano-TiC powder low-carbon magnesia-carbon brick and preparation method thereof, comprising 70-75wt% magnesia particles, 15-20wt% magnesia fine powder, 2-5wt% coarse-grained flake graphite, 1-3wt% fine-grained flake graphite, 0.5-1.5wt% carbon black, 1-2wt% metal aluminum powder, 1-3wt% metal silicon powder, 0.8-1wt% B 4 The C-C composite powder is mixed with 0.05-0.2wt% of nano TiC powder, and 3-5wt% of thermosetting liquid phenolic resin is added. After kneading and compression molding, the molding pressure is 200MPa; then heat treatment at 180-240°C for 24 hours to obtain B-containing 4 Low-carbon magnesia-carbon brick products of C-C composite powder and nano-TiC powder.

[0016] In the present embodiment 1, the MgO content of magnesia particle is 94~99wt%, and particle size is 5~0.088mm; The MgO content of magnesia fine powder is 94~99wt%, and particle size is less than 0.088mm; The carbon content of fine-grained flake graphite is ...

Embodiment 2

[0019] a B 4 C-C composite powder and nano-TiC powder low-carbon magnesia-carbon brick and preparation method thereof, comprising 60-70wt% magnesia particles, 18-30wt% magnesia fine powder, 2-3wt% coarse-grained flake graphite, 1-3wt% fine-grained flake graphite, 0.5-1.5wt% carbon black, 1-2wt% metal aluminum powder, 2-3wt% metal silicon powder, 0.1-0.8wt% B 4 The C-C composite powder is mixed with 0.2-0.4 wt% nano TiC powder, and 3-5 wt% of thermoplastic liquid phenolic resin is added. Others are with embodiment 1.

[0020] The prepared B-containing 4 C-C composite powder and nano-TiC powder low-carbon magnesia-carbon bricks, the performance test results show: 1400 ℃ buried carbon high temperature flexural strength 17.8Mpa; 1400 ℃ 2h heat preservation in air atmosphere for oxidation test, the decarburization layer area percentage is less than 13%; thermal shock test at 1200°C for 0.5h, the residual flexural strength retention rate is 90%; slag resistance test at 1600°C for...

Embodiment 3

[0022] a B 4 C-C composite powder and nano-TiC powder low-carbon magnesia-carbon brick and a preparation method thereof. 68-74wt% of magnesia particles, 15-22wt% of magnesia fine powder, 2-4wt% of coarse-grained flake graphite, 2-4wt% of fine-grained flake graphite, 0.5-1.5wt% of carbon black, 1 ~3wt% metal aluminum powder, 1~2wt% metal silicon powder, 0.1~1.0wt% B 4 The C-C composite powder is mixed with 0.05-0.4% nanometer TiC powder, and 3-5 wt% of coal tar pitch and solid powdery phenolic resin mixed resin are added. Others are with embodiment 1.

[0023] The prepared B-containing 4C-C composite powder and nano-TiC powder low-carbon magnesia-carbon bricks, the performance test results show: 1400 ℃ buried carbon high temperature flexural strength 18.2Mpa; 1400 ℃ 2h heat preservation in air atmosphere for oxidation test, the decarburization layer area percentage is less than 11%; thermal shock test at 1200°C for 0.5h, the residual flexural strength retention rate is 89%;...

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Abstract

The invention belongs to the technical field of low carbon magnesium carbon brick fire proof materials, in particular to a low carbon magnesium carbon brick containing B4C-C composite powder and nanometer TiC powder and a preparation method thereof. The adopted technical proposal comprises: mixing 60-75wt percent magnesia particles, 15-30wt percent magnesia fine powder, 1-5wt percent coarse-grained squama graphite, 1-5wt percent thin-grained squama graphite, 0.5-1.5wt percent carbon soot, 1-3wt percent metal aluminium powder, 1-3wt percent metal silicon powder, 0.1-1.0wt percent B4C-C composite powder and 0.05-0.4wt percent nanometer TiC powder, additionally adding 3-5wt percent organic bond, press forming after calendaring, and heat treatment 24 hours under the condition of 180 DEG C to 240 DEG C. The carbon content of prepared carbon magnesium carbon brick is less than 6 percent, and the carbon magnesium carbon brick has the characteristics of obvious antioxidant effect, strong high temperature strength, good thermal shock resistance, strong anti-slag corrosion and low cost.

Description

technical field [0001] The invention belongs to the technical field of low-carbon magnesia-carbon brick refractory materials. In particular, a B-containing 4 C-C composite powder and nano-TiC powder low-carbon magnesia-carbon brick and a preparation method thereof. Background technique [0002] With the advancement of smelting technology, traditional magnesia-carbon bricks can no longer meet the requirements of smelting some special steel types (such as ultra-low carbon steel), so the development and application of low-carbon content magnesia-carbon brick materials have received extensive attention. With the reduction of carbon content, not only the oxidation resistance of magnesia carbon bricks can be improved, but also the problem of carbon increase in the clean steel smelting process can be effectively solved. The reduction of carbon content in magnesia carbon bricks reduces the thermal conductivity of the bricks, which not only greatly reduces the energy consumption in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 朱伯铨李享成王志强
Owner WUHAN UNIV OF SCI & TECH
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