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Technology for preparing zirconia-zirconium boride bilayer composite ceramic heating unit through slip casting method

A ceramic heating element and double-layer composite technology, which is applied in the field of electric heating materials, can solve the problems of poor oxidation resistance and achieve the effect of overcoming the double heating system

Inactive Publication Date: 2015-08-19
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a process for preparing zirconia-zirconium boride double-layer composite ceramic heating element by grouting method. The heating element produced by this process can provide a high temperature of 2000~2100°C in an oxidizing environment, effectively overcoming the The shortcomings of the complex double heating system of the zirconia heating element during use and the poor oxidation resistance of the zirconium diboride composite ceramic heating element in an oxidizing atmosphere above 1800°C are eliminated.

Method used

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  • Technology for preparing zirconia-zirconium boride bilayer composite ceramic heating unit through slip casting method
  • Technology for preparing zirconia-zirconium boride bilayer composite ceramic heating unit through slip casting method
  • Technology for preparing zirconia-zirconium boride bilayer composite ceramic heating unit through slip casting method

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specific Embodiment 1-3

[0022] In order to make the content of the present invention more obvious and understandable, the present invention will be described in detail below in conjunction with specific examples 1-3.

[0023] Example 1-3 In the process of preparing zirconia-zirconium boride double-layer composite ceramic heating element by grouting method, ZrO 2 The formula of the composite powder and the mass percentage of each component in the formula are shown in Table 1.

[0024] Table 1: Formulas of stabilized zirconia in Examples 1-3 (mass percentage)

[0025]

[0026] Example 1-3 In the process of preparing a zirconia-zirconium boride double-layer composite ceramic heating element by grouting, the formula of the inner layer material and the mass percentage of each component in the formula are shown in Table 2.

Embodiment 1

[0030] The process of preparing zirconia-zirconium boride double-layer composite ceramic heating element by grouting method. The heating element is composed of a heating section, two transition sections and two wiring sections. Both the heating section and the transition section are made of two layers of ceramics inside and outside Structural composition, the inner layer is ZrB with solid core structure 2 Matrix composite ceramics, the outer layer is ZrO 2 Matrix composite ceramics;

[0031] The preparation of the heating element comprises the following steps:

[0032] Step 1. Take the raw material for preparing the outer layer structure of the heating element, mill it in a ball mill for 80 hours according to the weight ratio of raw material: water: ball = 1:1:3, pass through a 200-mesh sieve, and adjust the pH of the obtained slurry to 1.7-1.9. The density is 1.9~2.1g / cm 3 , that is, to obtain the outer layer slurry of the heating element, and set aside;

[0033]Step 2: T...

Embodiment 2

[0036] The process of preparing zirconia-zirconium boride double-layer composite ceramic heating element by grouting method. The heating element is composed of a heating section, two transition sections and two wiring sections. Both the heating section and the transition section are made of two layers of ceramics inside and outside Structural composition, the inner layer is ZrB with solid core structure 2 Matrix composite ceramics, the outer layer is ZrO 2 Matrix composite ceramics;

[0037] The preparation of the heating element comprises the following steps:

[0038] Step 1. Take the raw material for preparing the outer layer structure of the heating element, mill it in a ball mill for 120 hours according to the weight ratio of raw material: water: ball = 1:1:3, pass through a 300-mesh sieve, and adjust the pH of the obtained slurry to 1.7-1.9. The density is 1.9~2.1g / cm 3 , that is, to obtain the outer layer slurry of the heating element, and set aside;

[0039] Step 2:...

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Abstract

The invention discloses a technology for preparing a zirconia-zirconium boride bilayer composite ceramic heating unit through a slip casting method. The heating unit is formed by a heating section, two transition sections and two wiring sections, each of the heating section and the transition sections is formed by an inner and outer bilayer ceramic structure, the inner core is ZrB2 matrix composite ceramic with a solid core structure, and the outer layer is ZrO2 matrix composite ceramic. The preparation technology of the heating unit comprises the steps of preparing a heating unit outer layer slip, preparing a heating unit inner layer slip, carrying out slip casting molding, demolding, and sintering. The heating unit prepared by adopting the technology for preparing the zirconia-zirconium boride bilayer composite ceramic heating unit through the slip casting method can provide a high temperature of 2000-2100DEG C in oxidation environment, and effectively overcomes the disadvantages of needing of a complex double-heating system of a zirconia heating unit in the use process and poor oxidation resistance of a zirconium diboride composite ceramic heating unit at a temperature of above 1800DEG C.

Description

technical field [0001] The invention relates to the technical field of electric heating materials, in particular to a process for preparing a zirconia-zirconium boride double-layer composite ceramic heating element by a grouting method. Background technique [0002] At present, there are four types of heating elements that can generate high temperatures above 1800°C in an oxidizing atmosphere: zirconium diboride / silicon carbide composite ceramic heating elements, molybdenum disilicide composite ceramic heating elements, lanthanum chromate composite ceramic heating elements and Zirconium composite ceramic heating element. Zirconium diboride / silicon carbide composite ceramic heating element is a new type of ultra-high temperature heating element developed in recent years. It is characterized by high melting point, excellent electrical properties, mechanical properties and chemical stability. Below 1800°C, it has good oxidation resistance. However, it cannot be used for a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/58C04B35/622
Inventor 郭进武马军营陈权李军波汪庚先
Owner HENAN UNIV OF SCI & TECH