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A low-temperature cold-sintering preparation method of a zirconia ceramic setter plate used for MnZn ferrite sintering

A technology of zirconia ceramics and setter plates, applied in lighting and heating equipment, furnace components, furnaces, etc., can solve the problems of high sintering temperature and difficulty in densification

Inactive Publication Date: 2017-12-15
王诗阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high sintering temperature and difficulty in densification of 3Y-PSZ ceramic setter plates, the present invention proposes a low-temperature cold sintering preparation method for 3Y-PSZ ceramic setter plates

Method used

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  • A low-temperature cold-sintering preparation method of a zirconia ceramic setter plate used for MnZn ferrite sintering
  • A low-temperature cold-sintering preparation method of a zirconia ceramic setter plate used for MnZn ferrite sintering

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Experimental program
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Effect test

Embodiment 1

[0015] Select 3Y-PSZ powder with a purity of 99.5% and an average particle diameter of 40nm, put it into 30wt.% deionized water solvent according to the mass calculated in claim 1, ultrasonically disperse and stir for 20min, and obtain 3Y-PSZ The suspension was ground in a mortar for 10 min. According to the steps in claim 2, pour the prepared suspension into the mold, press cold at room temperature for 10 minutes, keep the temperature at 180° C. and hold the pressure for 3 hours, and the pressure is 400 MPa. Dry the 3Y-PSZ ceramic pre-sintered blank at 180°C for 12h. Adopt the process in claim 4 to carry out vacuum pressureless sintering, the process parameters are: sintering temperature 1000°C, holding time 4h, vacuum degree 1.3×10 -2 Pa.

[0016] Prepared ZrO 2 The density of ceramics can reach 94.5%, the bending strength of the material at room temperature is 573.5MPa, and its fracture toughness is 5.30MPa m 1 / 2 ; In the atmosphere furnace with inert gas, after 1100 ° ...

Embodiment 2

[0018] Select 3Y-PSZ powder with a purity of 99.5% and an average particle size of 30nm, put it into 30wt.% deionized water solvent according to the mass calculated in claim 1, ultrasonically disperse and stir for 30min, and obtain 3Y-PSZ The suspension was ground in a mortar for 15 min. According to the steps in claim 2, pour the obtained suspension into a mold, press coldly at room temperature for 15 minutes, keep the temperature at 190° C. and hold the pressure for 3 hours, and the pressure is 450 MPa. Dry the 3Y-PSZ ceramic pre-sintered blank at 190°C for 12h. Vacuum pressureless sintering is carried out using the process in claim 4, and the process parameters are: sintering temperature 1050°C, holding time 4h, vacuum degree 1.3×10 -2 Pa.

[0019] Prepared ZrO 2 The density of ceramics can reach 94.9%, the bending strength of the material at room temperature is 580.3MPa, and its fracture toughness is 5.42MPa m 1 / 2 ; In an atmosphere furnace fed with inert gas, after 11...

Embodiment 3

[0021] Select 3Y-PSZ powder with a purity of 99.9% and an average particle size of 20nm, put it into 30wt.% deionized water solvent according to the mass calculated in claim 1, ultrasonically disperse and stir for 40min, and obtain 3Y-PSZ The suspension was ground in a mortar for 20 min. According to the steps in claim 2, pour the prepared suspension into the mold, press cold at room temperature for 20 minutes, keep the temperature at 200° C. and hold the pressure for 3 hours, and the pressure is 450 MPa. The 3Y-PSZ ceramic pre-sintered compact was dried at 200°C for 18 hours. Vacuum pressureless sintering is carried out by adopting the process in claim 4, and the process parameters are: sintering temperature 1100°C, holding time 4h, argon protection.

[0022] Prepared ZrO 2 The density of ceramics can reach 95.5%, the bending strength of the material at room temperature is 615MPa, and its fracture toughness is 5.78MPa m 1 / 2 ; In an atmosphere furnace with inert gas, after ...

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Abstract

Aiming at problems that zirconia ceramic sintering temperatures are high and densification is difficult to achieve, the invention provides a low-temperature cold-sintering preparation method of a zirconia ceramic setter plate. Nanometer partially stabled zirconia powder (3Y-PSZ) is adopted as raw material powder, water or an aqueous solution is adopted as a solvent, a 3Y-PSZ ceramic presintered compact is prepared at a presintering temperature lower than 200 DEG C under a high uniaxial pressure, and then dense zirconia ceramic (the efficiency of space filling of which is greater than 94.0%) is prepared at an extremely low sintering temperature (not more than 1100 DEG C) by adopting pressureless sintering, hot press sintering and hot isostatic pressing sintering processes respectively. The prepared zirconia ceramic has excellent mechanical properties and thermal shock resistance. The method is simple in process, environmentally friendly and extremely low in energy consumption, can be an ideal preparation method for the zirconia ceramic setter plate used for MnZn ferrite sintering, and has a wide industrial application prospect.

Description

1. Technical field: [0001] The invention proposes a preparation method for low-temperature cold sintering of a zirconia ceramic setter plate used for firing MnZn ferrite. 2. Technical background: [0002] Initial Permeability μ of High Performance MnZn Ferrite i Very sensitive to Zn content. During the sintering process, the burning loss of Zn will lead to μ i Decline. The burning loss of Zn mainly comes from the contact between MnZn ferrite sintered core and refractory material. Therefore, the selection of materials for MnZn ferrite firing setters is particularly important. If an inappropriate setter material is used, such as ZnAl 2 o 4 phase, the magnetic core in contact with it is prone to heterogeneous crystallization, which affects the appearance and performance of the magnetic core product. [0003] Zirconia (ZrO 2 ) Ceramics have good high temperature chemical stability, but pure ZrO 2 Ceramics will produce a monoclinic phase (m-ZrO 2 ) and tetragonal phase ...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/66C04B35/64C04B35/645F27D5/00
CPCC04B35/48C04B35/64C04B35/645C04B35/6455C04B35/66C04B2235/3225C04B2235/3246C04B2235/5454C04B2235/656C04B2235/658C04B2235/6581C04B2235/661C04B2235/96F27D5/00
Inventor 傅昊洋王诗阳朱小硕李子峰
Owner 王诗阳
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