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Carbon-calcium aluminate composite powder and preparation method thereof

A technology of calcium aluminate and composite powder is applied in the fields of carbon-calcium aluminate composite powder and its preparation, and refractory pouring materials, which can solve the problems of poor oxidation resistance, poor dispersibility and poor wettability, and achieves improved dispersibility and convenience. Control, the effect of few influencing factors

Active Publication Date: 2017-08-25
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the defects and deficiencies in the prior art, the object of the present invention is to provide a carbon-calcium aluminate composite powder and a preparation method thereof, so as to solve the poor dispersion caused by carburizing refractory castables by physical methods in the prior art, Technical problems of poor wettability and poor oxidation resistance

Method used

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  • Carbon-calcium aluminate composite powder and preparation method thereof
  • Carbon-calcium aluminate composite powder and preparation method thereof
  • Carbon-calcium aluminate composite powder and preparation method thereof

Examples

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Embodiment 1

[0045] The present embodiment provides a kind of preparation method of carbon-calcium aluminate composite powder, and this method is raw material with alumina powder (purity ≥ 99.0%) and calcium stearate (purity ≥ 99.0%), by mass parts, Made from the following raw materials: Calcium Stearate 85.61%, Aluminum Oxide 14.39%. Put the uniformly mixed raw materials in a corundum crucible, bury carbon in a resistance furnace for sintering, raise the temperature to 1600°C, and keep it at 1600°C for 4 hours. After the furnace temperature drops to room temperature, turn off the power and open the furnace door to take out the materials. The fired material is crushed and ground to obtain carbon-calcium aluminate composite powder.

[0046] Specifically, the heating rate of the heating process is carried out in the following manner:

[0047] Below 700°C, the heating rate is 5°C / min;

[0048] From 700°C to 1100°C, the heating rate is 4°C / min;

[0049] From 1100°C to 1200°C, the heating ra...

Embodiment 2

[0056] The present embodiment provides a kind of preparation method of carbon-calcium aluminate composite powder, and this method is raw material with aluminum oxide powder (purity ≥ 99.0%) and calcium gluconate (purity ≥ 99.0%), by mass parts. Made from the following raw materials: Calcium Gluconate 80.8%, Aluminum Oxide 19.2%. Put the uniformly mixed raw materials in a corundum crucible, in a tube furnace, under the protection of nitrogen, raise the temperature to 1400°C, keep it at 1400°C for 3 hours, after the furnace temperature drops to room temperature, turn off the power and open the furnace door to take out the materials . The fired material is crushed and ground to obtain carbon-calcium aluminate composite powder.

[0057] Specifically, the heating process is the same as in Example 1.

[0058] The carbon-calcium aluminate composite powder prepared in this example is detected and analyzed by XRD and Raman spectroscopy, the results can be found in image 3 and Fig...

Embodiment 3

[0062] The present embodiment provides a kind of preparation method of carbon-calcium aluminate composite powder, and this method is raw material with aluminum oxide powder (purity ≥ 99.0%) and calcium gluconate (purity ≥ 99.0%), by mass parts. Made from the following raw materials: Calcium Gluconate 80.8%, Aluminum Oxide 19.2%. Put the uniformly mixed raw materials in a corundum crucible, in a tube furnace, under the protection of argon, raise the temperature to 1200°C, keep it at 1200°C for 4 hours, after the furnace temperature drops to room temperature, turn off the power and open the furnace door to remove the materials take out. The fired material is crushed and ground to obtain carbon-calcium aluminate composite powder.

[0063] Specifically, the heating process is the same as in Example 1.

[0064] The carbon-calcium aluminate composite powder that makes in the present embodiment is detected and analyzed with XRD and Raman spectrum, and its result and image 3 and ...

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Abstract

The invention provides a preparation method of carbon-calcium aluminate composite powder. By the method, aluminium oxide is adopted as raw material, and organic acid calcium is adopted as raw material, in non-oxidizing atmosphere, carbon-calcium aluminate composite powder is obtained by high temperature sintering. The organic acid calcium has two effects, organic acid acts as a calcium source and a carbon source, by taking advantage of this characteristic, in high temperature non-oxidizing atmosphere, sintering is conducted on organic acid calcium and aluminum oxide, pyrolysis is conducted on organic acid calcium, carbon is reduced, new generated calcium oxide and aluminium oxide in the raw materials react to form a calcium aluminate, carbon / calcium aluminium powder is synthesized in one step by utilizing this characteristic. The method has the characteristic of in-situ synthesis, and carbon source is added by means of chemical reactions, carbon source after the chemical reactions gets into composite materials, the dispersity of carbon is greatly increased, far superior to the dispersity of the carbon added by means of physical penetration in the prior art.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials and relates to refractory pouring materials, in particular to a carbon-calcium aluminate composite powder and a preparation method thereof. Background technique [0002] With the continuous development of refractory materials, amorphous refractory castables based on calcium aluminate cement are widely used in blast furnace tapholes, ladles, and cement rotary kiln linings due to their energy saving, environmental protection, convenient construction, and excellent performance. Wait. [0003] For traditional refractory castables, the lower the calcium aluminate cement content, the better the strength, service temperature and life of the overall castable. Therefore, the development of refractory castables tends to be low cement and ultra-low cement content. [0004] As the main component of refractory castables, oxides inevitably have problems such as poor corrosion resistance and poor...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/44C04B35/622C04B35/64
CPCC04B35/44C04B35/622C04B35/64C04B35/66C04B2235/3217C04B2235/422C04B2235/449C04B2235/6562C04B2235/6586
Inventor 肖国庆雷紫涵丁冬海任耘杨守磊
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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