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Low-temperature curing ceramic powder and method for producing the same

A technology of ceramic powder and low temperature, applied in the field of materials, can solve the problems of high scrap rate, high comprehensive performance, incomplete filling, etc., achieve stable material performance, excellent comprehensive effect, and solve the effect of easy flow

Inactive Publication Date: 2009-05-13
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the insulating materials used to make thermocouples and fixed hot electrodes at home and abroad are roughly divided into three types: 1. Filled paste aluminum-magnesium thermal cement, which is used in working environments below 800 ° C. The filling of this insulating material is time-consuming and laborious, and it is often full. , the filling is not solid, and the rejection rate is high; 2. Insulating solids generated by sintering inorganic non-metallic powder at high temperature (above 900 ° C), this insulating material is not suitable for the application of low-temperature thermocouples; 3. Injected emulsion or liquid, natural drying Cured insulation, only suitable for low temperature working environment below 100 ℃
The above three insulating materials each have a strict working environment, but it is difficult to meet the requirements of wide operating temperature range, harsh working environment and high comprehensive performance of thermocouples in the field of aviation technology.

Method used

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  • Low-temperature curing ceramic powder and method for producing the same
  • Low-temperature curing ceramic powder and method for producing the same
  • Low-temperature curing ceramic powder and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Will Al 2 o 3 , SiO 2 and MgO were put into the high-temperature test kiln furnace for high-temperature pre-burning. The pre-burning method is: the Al 2 o 3 , SiO 2 Or MgO is heated to 1560°C to complete high-temperature pre-burning. The pre-burning temperature-time curve is as figure 1 shown.

[0026] Al 2 o 3 , SiO 2 and MgO were respectively put into a test ball mill, and water was added to impregnate the material until the water surface was 10 mm above the material; then ball milled to a fineness of 250-300 mesh. Al after ball milling 2 o 3 , SiO 2 , MgO is dried in a drying oven to remove moisture, the drying temperature is 120±5°C, and the drying time is 2h.

[0027] The thermosetting plastic PA6 and thermosetting plastic PC are pre-fired at low temperature. The pre-firing method is: heating to 120 °C at a heating rate of 7-8 °C / h, and then heating to 300 °C at a heating rate of 18-20 °C / h , to complete low temperature pre-firing. The pre-burning te...

Embodiment 2

[0032] Will Al 2 o 3 , SiO 2 and MgO were placed in the high-temperature test kiln furnace for high-temperature pre-burning. The pre-burning method is: the Al 2 o 3 , SiO 2 Or MgO is heated to 1500°C to complete high-temperature pre-burning. Al 2 o 3 , SiO 2 and MgO were respectively put into the test ball mill, and water was added to impregnate the material until the water surface was 12mm above the material; then ball milled to a fineness of 250-300 mesh. Al after ball milling 2 o 3 , SiO 2 , MgO is dried in a drying oven to remove moisture, the drying temperature is 120±5°C, and the drying time is 2h.

[0033] The thermosetting plastic PA66 and thermosetting plastic PC are pre-fired at low temperature. The pre-firing method is: heating to 120 °C at a heating rate of 7-8 °C / h, and then heating to 300 °C at a heating rate of 18-20 °C / h , to complete low temperature pre-firing.

[0034] Heat the thermosetting plastic PA66 and thermosetting plastic PC after low-tempe...

Embodiment 3

[0038] Will Al 2 o 3 , SiO 2 and MgO were put into the high-temperature test kiln furnace for high-temperature pre-burning. The pre-burning method is: the Al 2 o 3 , SiO 2 Or MgO is heated to 1575°C to complete high-temperature pre-burning. Al 2 o 3 , SiO 2 and MgO were respectively put into the test ball mill, and water was added to impregnate the material until the water surface was 13 mm above the material; then ball milled to a fineness of 250-300 mesh. Al after ball milling 2 o 3 , SiO 2 , MgO is dried in a drying oven to remove moisture, the drying temperature is 120±5°C, and the drying time is 2h.

[0039] The thermosetting plastic PA6 and thermosetting plastic PC are pre-fired at low temperature. The pre-firing method is: heating to 120 °C at a heating rate of 7-8 °C / h, and then heating to 300 °C at a heating rate of 18-20 °C / h , to complete low temperature pre-firing.

[0040] Heat the thermosetting plastic PA6 and thermosetting plastic PC after low-tempe...

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Abstract

The invention relates to low temperature curing ceramic powder and a method for preparing the same, which belongs to the technical field of material. The ceramic powder comprises the following compositions in weight percentage: 42 to 50 percent of Al2O3, 15 to 18 percent of SiO2, 3.5 to 6.5 percent of MgO, 28 to 35 percent of thermosetting plastic PA, and 0.5 to 1 percent of thermosetting plastic PC. The method for preparing the low temperature curing ceramic powder comprises the following steps: performing high temperature pre-sintering and ball milling on the Al2O3, the SiO2 and the MgO respectively, and then removing the water through drying; performing low temperature presintering and water vapor heating on the thermosetting plastic PA and the thermosetting plastic PC, and then screening out the part of which the fineness is between 250 and 300 meshes; and mixing inorganic materials and organic materials after the treatment, stirring the materials evenly to preparing the low temperature curing ceramic powder. Through a test under the condition that the temperature is between 40 DEG C below zero and 1,500 DEG C, the air velocity is 200 meters per second, the airflow pressure is 2 MPa and the vibration frequency is 2,500 Hz, the low temperature curing ceramic powder is proved to have stable material performance and excellent comprehensive effect, and can be a filling insulating material for various types of thermocouples.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a low-temperature solidified ceramic powder and a preparation method thereof. Background technique [0002] At present, the insulating materials used to make thermocouples and fixed hot electrodes at home and abroad are roughly divided into three types: 1. Filled paste aluminum-magnesium thermal cement, which is used in working environments below 800 ° C. The filling of this insulating material is time-consuming and laborious, and it is often full. , the filling is not solid, and the scrap rate is high; 2. Insulating solids formed by sintering inorganic non-metallic powder at high temperature (above 900 ° C), this insulating material is not suitable for the application of low-temperature thermocouples; 3. Injected emulsion or liquid, natural drying The cured insulation is only suitable for low temperature working environment below 100 ℃. The above three insulating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/634C04B35/622
Inventor 韩迪赵维勋万利冯文田卢义
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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