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Calcium hexaaluminate hollow whisker reinforced aluminum-calcium composite refractory material and preparation method thereof

A technology of calcium hexaaluminate and refractory materials, which is applied in the field of aluminum-calcium composite refractory materials, can solve the problems of low thermal conductivity of calcium hexaaluminate materials, limit thermal shock resistance, increase risk of impurities, etc., and achieve excellent anti-corrosion Thermal shock performance, improved thermal shock stability, high refractoriness effect

Active Publication Date: 2022-03-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the preparation of aluminum-calcium composite materials, the calcium hexaaluminate phase is mainly formed by the reaction of pure calcium source and aluminum source, such as "a preparation method of dense high-purity calcium hexaaluminate-corundum composite material (201810485450.2)" , "Method for preparing light calcium hexaaluminate-magnesium aluminum spinel composite refractories at low temperature by two-step method (201410320989.4)" and "A calcium zirconate-calcium hexaaluminate composite porous ceramic and its preparation method (201910736877. X)", because these methods require many kinds of raw materials, not only will increase the risk of introducing impurities, but also the process is complicated and the cost is high
[0003] Calcium hexaaluminate-corundum ceramic composites prepared from calcium aluminate titanate (also known as ferrotitanium slag) and alumina have ideal specific heat capacity and thermal conductivity, but the layered cleavage of calcium hexaaluminate limits further improvement. Thermal shock resistance of composite materials (Jianfeng Wu, Chen Zhang, et al.Preparation and characterization of aluminum / calcium-hexaluminate ceramic composites from ferrotitanium slag[J].Journal of the European Ceramic Society,2020,40(12):4265~ 4275.)
[0004] The calcium hexaaluminate whiskers generated by in-situ reaction can improve the high-temperature mechanical strength and thermal shock resistance of composite materials, such as "a calcium hexaaluminate whisker-reinforced calcium-aluminum refractory material (201910704994.8)", but it makes The characteristic low thermal conductivity of calcium hexaaluminate material decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A calcium hexaaluminate hollow whisker reinforced aluminum-calcium composite refractory material and a preparation method thereof. The preparation method described in this embodiment is:

[0026] Using 55wt% calcium aluminate titanate particles, 15wt% alumina micropowder, 15wt% calcium source and 15wt% starch as raw materials, plus 2wt% aluminum fluoride fine powder of the raw materials, mixing to obtain a mixture; The mixture was dry-blended in a ball mill for 10 minutes, and then 5 wt% of the raw material was added as an organic binder, ball milled for 20 minutes, and machine-pressed into shape; then dried at 100°C for 20 hours, and kept at 1450°C for 2 hours to obtain six Calcium aluminate hollow whisker reinforced aluminum-calcium composite refractories.

[0027] The calcium source is calcium oxide.

[0028] The organic binding agent is sodium dihydrogen phosphate.

[0029] The pressure of the machine pressing is 50MPa.

Embodiment 2

[0031] A calcium hexaaluminate hollow whisker reinforced aluminum-calcium composite refractory material and a preparation method thereof. The preparation method described in this embodiment is:

[0032] Using 60wt% of calcium aluminate titanate particles, 20wt% of alumina micropowder, 10wt% of calcium source and 10wt% of starch as raw materials, plus 3wt% of aluminum fluoride fine powder of the raw materials, mixing to obtain a mixture; The mixture was dry-blended in a ball mill for 11 minutes, and then 6 wt% of the raw material was added as an organic binder, ball milled for 22 minutes, and machine-pressed; then dried at 105°C for 16 hours, and kept at 1550°C for 2 hours to obtain six Calcium aluminate hollow whisker reinforced aluminum-calcium composite refractories.

[0033] The calcium source is calcium hydroxide.

[0034] The organic binder is polyvinyl alcohol.

[0035] The pressure of the machine pressing is 52MPa.

Embodiment 3

[0037] A calcium hexaaluminate hollow whisker reinforced aluminum-calcium composite refractory material and a preparation method thereof. The preparation method described in this embodiment is:

[0038] Using 60wt% calcium aluminate titanate particles, 15wt% alumina micropowder, 20wt% calcium source and 5wt% starch as raw materials, plus 5wt% aluminum fluoride fine powder of the raw materials, mixing to obtain a mixture; The mixture was dry-blended in a ball mill for 13 minutes, and then 8 wt% of the raw material was added as an organic binder, ball milled for 23 minutes, and machine-pressed into shape; then dried at 110°C for 24 hours, and kept at 1650°C for 3 hours to obtain six Calcium aluminate hollow whisker reinforced aluminum-calcium composite refractories.

[0039] The calcium source is calcium carbonate.

[0040] The organic binding agent is ethanol.

[0041] The pressure of the machine pressing is 53MPa.

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Abstract

The invention relates to a calcium hexaaluminate hollow whisker-reinforced aluminum-calcium composite refractory material and a preparation method thereof. The technical solution is: 55-65wt% of calcium aluminate titanate particles, 15-20wt% of alumina micropowder, 10-20wt% of calcium source and 5-15wt% of starch are used as raw materials, and 1-5wt% of the raw materials are added % aluminum fluoride fine powder, mixed to obtain a mixture; dry mix the mixture in a ball mill for 10-15 minutes, then add 5-10 wt% of the organic binder of the raw material, ball mill for 20-25 minutes, and press to form ; Then dry at 100-110°C for 12-24 hours, and keep warm at 1450-1650°C for 2-3 hours to prepare calcium hexaaluminate hollow whisker-reinforced aluminum-calcium composite refractories. The invention has the characteristics of low cost and simple process. The prepared calcium hexaaluminate hollow whisker-reinforced aluminum-calcium composite refractory material has low thermal conductivity, high flexural compressive strength, low thermal expansion coefficient and low thermal shock resistance. Excellent stability.

Description

technical field [0001] The invention belongs to the technical field of aluminum-calcium multiphase refractory materials. Specifically relates to a calcium hexaaluminate hollow whisker reinforced aluminum-calcium composite refractory material and a preparation method thereof. Background technique [0002] Calcium hexaaluminate (CaO 6Al 2 o 3 ) is a new type of refractory material developed in recent years. Its melting point is higher than 1875°C and its theoretical density is 3.79g / cm 3 , has a series of excellent properties, and its various composite materials have been successfully used in steelmaking and ceramic industrial kilns. At present, in the preparation of aluminum-calcium composite materials, the calcium hexaaluminate phase is mainly formed by the reaction of pure calcium source and aluminum source, such as "A preparation method for dense and high-purity calcium hexaaluminate-corundum composite material (201810485450.2)" , "A method for preparing lightweight ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/44
CPCC04B35/66C04B35/44C04B2235/3217C04B2235/445C04B2235/3208C04B2235/5427C04B2235/5436C04B2235/602C04B2235/606C04B2235/656C04B2235/6567
Inventor 余俊李晶杨赵惠忠张寒
Owner WUHAN UNIV OF SCI & TECH