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Preparation process of antioxidant composite powder

A composite powder and antioxidant technology, applied in the field of refractory materials, can solve the problems of the segregation of uneven components of the mixture, reduce the overall application effect, etc., and achieve the effects of rapid response, promotion and application value improvement, and overall performance improvement.

Active Publication Date: 2010-03-03
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when multiple materials are compounded and added, due to uneven mixing, the segregation of ingredients is inevitable, thus reducing the overall application effect

Method used

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  • Preparation process of antioxidant composite powder
  • Preparation process of antioxidant composite powder
  • Preparation process of antioxidant composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 60%Al+10%Si+30%C

[0036] (1) Ball milling and mixing for 16 hours, the balls are Al 2 o 3 Balls, the ratio of ball to material is 1:2;

[0037] (2) The mixture is extruded into a prefabricated block with a relative density of 40%;

[0038] (3) Dry the prefabricated blocks at 100°C for 8 hours;

[0039] (4) the prefabricated block after drying is placed in the inner layer of the container made of carbon felt;

[0040] (5) Metal Al powder, diluent aluminum nitride and additive NH 4 Cl ball milling mixing 24 hours, this mixture is placed in the container outer layer of carbon felt as combustion-accelerating agent (diluent aluminum nitride in the accelerant is 20wt% of aluminum powder weight, additive NH 4 Cl is 1wt% of the total weight of the combustion aid)

[0041] (6) The ratio of the total weight of the combustion aid to the total weight of the reactants is: 3:1

[0042] (7) After the container is evacuated, it is filled with high-purity nitrogen to 8MPa, and t...

Embodiment 2

[0044] 58%Al+10%Si+32%C

[0045] (1) Ball milling and mixing for 24 hours, the balls are Al 2 o 3 Balls, the ratio of ball to material is 1:3;

[0046] (2) The mixture is extruded into a prefabricated block with a relative density of 40%;

[0047] (3) Dry the prefabricated blocks at 100°C for 8 hours;

[0048] (4) the prefabricated block after drying is placed in the inner layer of the container made of carbon felt;

[0049] (5) Metal Al powder, diluent aluminum nitride and additive NH 4 Cl ball milling mixing 24 hours, this mixture is placed in the container outer layer of carbon felt as combustion-accelerating agent (diluent aluminum nitride in the accelerant is 20wt% of aluminum powder weight, additive NH 4 Cl is 1wt% of the total weight of the combustion aid)

[0050] (6) The ratio of the total weight of the combustion aid to the total weight of the reactants is: 3.5:1

[0051] (7) After the container is evacuated, it is filled with high-purity nitrogen to 8MPa, and...

Embodiment 3

[0053] 56%Al+13%Si+31%C

[0054] (1) Ball milling and mixing for 30 hours, the balls are Al 2 o 3 Balls, the ratio of ball to material is 1:3;

[0055] (2) The mixture is extruded into a prefabricated block with a relative density of 60%;

[0056] (3) Dry the prefabricated blocks at 200°C for 6 hours;

[0057] (4) the prefabricated block after drying is placed in the inner layer of the container made of carbon felt;

[0058] (5) Metal Al powder, diluent aluminum nitride and additive NH 4 Cl ball milling mixing 24 hours, this mixture is placed in the container outer layer of carbon felt as combustion-accelerating agent (diluent aluminum nitride in the accelerant is 20wt% of aluminum powder weight, additive NH 4 Cl is 1wt% of the total weight of the combustion aid)

[0059] (6) The ratio of the total weight of the combustion aid to the total weight of the reactants is: 4:1

[0060] (7) After the container is evacuated, it is filled with high-purity nitrogen to 10MPa, and ...

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Abstract

The invention belongs to the technical field of refractory materials and provides a preparation process of antioxidant composite powder. The preparation process comprises the following steps: ball-milling and blending raw materials according to a certain weight percentage; carrying out cold pressing to form precast blocks with the relative density of 30 percent to 60 percent; insulating and dryingthe precast blocks at a temperature of between 100 DEG C and 200DEG C; placing the precast blocks in the inner layer of a vessel made of carbon fiber felt, and filling an auxiliary incendiary agent in the an outer layer of the vessel, vacuumizing the vessel, leading in nitrogen gas in the vessel, and synthesizing the required powder at high temperature by self-propagation. The invention has the characteristics that the preparation process is suitable for large-scale production; the synthesized powder does not contai easily-hydrated raw materials of metallic aluminum and an intermediate product of Al3C4, thereby avoiding causing damage for later application. The synthesized Al4SiC4 crystal grains are fine with the average grain diameter of less than 20 microns, have uniform structures andhigh purity, and are in hexagon shapes. The generated intermediate products SiC in the powder and new-phase Al4SiC4 and Al4O4C are compounded and added in a functional refractory material, thereby theantioxidant composite powder has better oxidation resistance, hydrability resistance and high-temperature service performance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a preparation process of antioxidant composite powder. Background technique [0002] In recent years, with the rapid development of continuous casting technology, higher requirements have been put forward for functional refractory materials. Carbon-containing refractory materials have been widely used in the field of functional refractory materials due to their excellent corrosion resistance and thermal shock resistance. However, due to the presence of carbon, carbonaceous materials are easily oxidized at high temperatures, resulting in decarburization, which further leads to the destruction of the material structure. [0003] A large number of studies have shown that metal fine powders Al, Si and SiC are the most common antioxidants, especially Al powder is widely used in magnesium carbon and aluminum carbon refractories, which plays an important role in...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/515C04B35/66
Inventor 周军王刚李红霞刘国齐周继伟王来稳任钢伟闫红涛
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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