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Low-thermal-conductivity calcium zirconate material and preparation method thereof

A technology of calcium zirconate and low thermal conductivity, which is applied in the field of calcium zirconate materials, can solve the problems of large heat loss, high energy consumption in smelting, and poor thermal insulation performance, and achieve the effects of small volume density, low thermal conductivity, and low cost

Active Publication Date: 2022-02-18
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Refractory materials prepared from refractory raw materials with high bulk density and high thermal conductivity have relatively low thermal conductivity during high-temperature smelting. Refractory materials prepared from refractory raw materials with high bulk density and high porosity have poor thermal insulation performance and heat loss Larger, will lead to higher smelting energy consumption

Method used

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  • Low-thermal-conductivity calcium zirconate material and preparation method thereof
  • Low-thermal-conductivity calcium zirconate material and preparation method thereof
  • Low-thermal-conductivity calcium zirconate material and preparation method thereof

Examples

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Embodiment 1

[0029] A low thermal conductivity calcium zirconate material and a preparation method thereof. The preparation method described in this embodiment is:

[0030] Press CaO:ZrO first 2 The molar ratio is 1: (1 ~ 1.02), calcium hydroxide and basic zirconium carbonate are mixed to obtain the mixture; then with absolute ethanol as the medium, the mixture is mixed for 20 to 30 minutes, and the mixture is mixed in the air Put it aside for 20-24 hours, press it into a block, and keep it warm at 180-190°C for 2-7 hours to get a pretreated block; then put the pretreated fast material in a high-temperature furnace and keep it warm at 1500-1550°C After cooling for 2-3 hours, a calcium zirconate material with low thermal conductivity is obtained.

[0031] The low thermal conductivity calcium zirconate material prepared in this example is tested: the content of calcium zirconate is 94.1-95.5%, and the bulk density is 2.82-2.90g / cm 3 , the porosity is 35.1-36.3%, and the thermal conductivi...

Embodiment 2

[0037] A low thermal conductivity calcium zirconate material and a preparation method thereof. The preparation method described in this embodiment is:

[0038] Press CaO:ZrO first 2 The molar ratio is 1: (1.02 ~ 1.03), calcium hydroxide and basic zirconium carbonate are mixed to obtain the mixture; then using absolute ethanol as the medium, the mixture is mixed for 30 to 40 minutes, and the mixture is mixed in the air Put it aside for 22-26 hours, press it into a block, and keep it warm at 190-195°C for 7-10 hours to obtain a pretreated block; then place the pre-treated fast material in a high-temperature furnace and keep it warm at 1550-1600°C After cooling for 3-5 hours, a calcium zirconate material with low thermal conductivity is prepared.

[0039] The low thermal conductivity calcium zirconate material prepared in this example is tested: the content of calcium zirconate is 92.7-94.9%, and the bulk density is 2.87-2.96g / cm 3 , the porosity is 35.8-37.1%, and the thermal...

Embodiment 3

[0045] A low thermal conductivity calcium zirconate material and a preparation method thereof. The preparation method described in this embodiment is:

[0046] Press CaO:ZrO first 2 The molar ratio is 1: (1.03 ~ 1.05), calcium hydroxide and basic zirconium carbonate are mixed to obtain the mixture; then with absolute ethanol as the medium, the mixture is mixed for 40 to 60 minutes, and in the air Stand for 24-28 hours, press into blocks, and keep warm at 195-200°C for 10-12 hours to obtain pretreated blocks; then place the pretreated fast materials in a high-temperature furnace and keep warm at 1600-1700°C After cooling for 2-3 hours, a calcium zirconate material with low thermal conductivity is obtained.

[0047] The low thermal conductivity calcium zirconate material prepared in this example is tested: the content of calcium zirconate is 90.1-93.8%, and the bulk density is 2.93-3.0g / cm 3 , the porosity is 35.4-36.5%, and the thermal conductivity at 1000°C is 1.20-1.26W / (m...

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Abstract

The invention relates to a low-thermal-conductivity calcium zirconate material and a preparation method thereof. According to the technical scheme, the method comprises the following steps: mixing calcium hydroxide and basic zirconium carbonate according to a molar ratio of CaO to ZrO2 of 1:(1-1.05) to obtain a mixture; taking absolute ethyl alcohol as a medium, mixing the mixture for 20-60 minutes, placing the mixture in air for 20-28 hours, pressing the mixture into blocks, and keeping the temperature at 180-200 DEG C for 2-12 hours to obtain pretreated blocks; and then placing the pre-treated fast material in a high-temperature furnace, preserving heat for 2-5 hours at 1500-1700 DEG C, and performing cooling to obtain the low-heat-conductivity calcium zirconate material. The method is simple in process, low in cost and environment-friendly; and the prepared product is small in volume density, high in porosity and low in heat conductivity coefficient, the components are all high-temperature phases, and when the product is used as a raw material for preparing high-temperature ceramics and refractory materials, energy loss in the metallurgical process can be remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of calcium zirconate materials. In particular, it relates to a low thermal conductivity calcium zirconate material and a preparation method thereof. Background technique [0002] Titanium alloy has the characteristics of low density, light weight, high heat resistance, high strength ratio, good fatigue resistance and crack growth resistance, high toughness and high corrosion resistance. It is widely used in aviation, aerospace, military, shipbuilding, vehicle engineering and biomedicine. and other fields have excellent application prospects. However, there are some obstacles to the widespread application of titanium alloys, mainly in its cost structure, smelting costs account for 30-40%. In the high-temperature molten state, titanium has high chemical activity. Under the current smelting conditions, it will react with almost all refractory materials at the interface. Therefore, these common refractory mate...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/48C04B35/622C04B35/66
CPCC04B38/0025C04B35/48C04B35/622C04B35/66C04B2235/3208C04B2235/602C04B2235/656C04B2235/6567C04B2235/77C04B2235/9607
Inventor 魏耀武王方舟李炳蓉
Owner WUHAN UNIV OF SCI & TECH