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A kind of preparation method of dense chromium oxide product with high thermal shock stability

A chromium oxide and stability technology, applied in the field of refractory materials, can solve the problems of inability to meet alkali-free glass fiber kilns, reduce production efficiency and overall service life, and poor bulk density gradients, so as to eliminate impurities such as chromium and carbon compounds. Generate, improve sintering performance and service performance, and solve the effect of large gradient difference between internal and external bulk density

Active Publication Date: 2022-02-11
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0010] At present, defects such as high bulk density gradient difference and low thermal shock stability of dense chromium products restrict their production efficiency and increase production costs. At the same time, the chromium oxide after peeling pollutes the chemical components of glass fibers and affects the alkali-free glass fiber pool kiln. wire drawing process, reducing production efficiency and overall service life
Due to the large size of dense chromium products used in areas with severe high-temperature erosion such as the bottom and walls of melting pools, there is a large density gradient difference between the inside and outside of the product, and the performance of each part presents significant inhomogeneity, resulting in low yield and poor thermal shock stability. It has been unable to meet the rapid development of alkali-free glass fiber tank kiln technology

Method used

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  • A kind of preparation method of dense chromium oxide product with high thermal shock stability
  • A kind of preparation method of dense chromium oxide product with high thermal shock stability
  • A kind of preparation method of dense chromium oxide product with high thermal shock stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: select particle size to be 325 purpose chromium oxide composite micropowder: Cr 2 o 3 Micropowder 86.0wt.%, TiO 2Micropowder 4.0wt.%, metal zirconium powder 10.0wt.%, and calcium lignosulfonate 1.0wt.% and polyvinyl alcohol 0.1wt.%, evenly mixed pulping centrifugal granulation, after 180MPa machine press molding, put into electric furnace In the kiln, 99.99% Ar gas is introduced into the kiln through the control of the flow meter to ensure a slight positive pressure of 10mm water column in the kiln to prevent the outside air from entering the kiln, and then sintered at 1650°C for 2 hours to obtain high thermal shock stability Sexual dense chromium oxide products. In comparative example 1, a sample of the same specification prepared without metal zirconium powder was sintered at 1700° C. for 2 hours in an air atmosphere. The bulk density, apparent porosity and thermal shock stability of their inner and outer regions are compared in Table 1.

[0021] Tab...

Embodiment 2

[0023] Embodiment 2: select particle size to be 325 purpose chromium oxide composite micropowder: Cr 2 o 3 Micropowder 93.0wt.%, TiO 2 4.0wt.% of fine powder, 3.0wt.% of metal zirconium powder, and 1.0wt.% of polyvinyl alcohol are evenly mixed to make pulp, spray granulate, and then put into electric furnace kiln after isostatic pressing at 150MPa. Introduce 99.999% Ar gas into the kiln, observe to ensure a slight positive pressure of 10mm water column in the kiln to prevent outside air from entering the kiln, and then sinter at 1450°C for 8 hours to obtain dense chromium oxide products with high thermal shock stability. In Comparative Example 2, a sample of the same specification prepared without metal zirconium powder was sintered at 1700° C. for 8 hours in an air atmosphere. The bulk density, apparent porosity and thermal shock stability of their inner and outer regions are compared in Table 2.

[0024] Table 2

[0025]

Embodiment 3

[0026] Embodiment 3: select particle size to be 325 purpose chromium oxide composite micropowders: Cr 2 o 3 Micropowder 95.0wt.%, TiO 2 Micropowder 4.0wt.%, metal zirconium powder 1.0wt.%, and carboxymethyl cellulose powder 0.1wt.% and polyvinyl alcohol 0.1wt.% are uniformly mixed, pulped and centrifuged to granulate, and then packed by 150MPa machine pressing Electric furnace kiln, 99.999% Ar gas is introduced into the kiln through the control of the flow meter, and the observation ensures that the kiln is under a slight positive pressure of 10mm water column to prevent the outside air from entering the kiln, and then sintered at 1550°C for 4 hours. Shock stability dense chromium oxide products. In comparative example 3, a sample of the same specification prepared without metal zirconium powder was sintered at 1700° C. for 4 hours in an air atmosphere. The bulk density, apparent porosity and thermal shock stability of their inner and outer regions are compared in Table 3. ...

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Abstract

The invention belongs to the technical field of refractory materials, and proposes a method for preparing dense chromium oxide products with high thermal shock stability. A method for preparing dense chromium oxide products with high thermal shock stability is proposed. The raw material of chromium oxide products is chromium oxide composite micropowder with particle size ≤ 45 μm; chromium oxide composite micropowder includes chromium oxide micropowder, titanium oxide micropowder and binder; Metal Zr micropowder is also added to the chromium composite micropowder; the chromium oxide body is obtained after the chromium oxide composite micropowder is homogenized and granulated, and the high-purity inert gas Ar is introduced into the electric furnace kiln equipped with the chromium oxide body, at 1450~ At a temperature of 1650°C, heat preservation for 2 to 8 hours and sinter to obtain a dense chromium oxide product with high thermal shock stability and a chromium oxide content of more than 86%. The invention solves the problems of large gradient difference between the inside and outside of the dense chromium oxide product and poor thermal shock stability, ensures the uniformity of the internal structure of the dense chromium oxide product, and improves the sintering performance and serviceability of the large-scale dense chromium product.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and relates to a method for preparing dense chromium oxide products with high thermal shock stability through external atmosphere protection and internal reduction and low oxygen partial pressure sintering in the alkali-free glass fiber industry, in particular to a method with high thermal shock stability A method for preparing dense chromium oxide products. Background technique [0002] As the application environment becomes more and more harsh, the alkali-free glass fiber generally introduces such as Al 2 o 3 , B 2 o 3 And other components such as BaO are different from traditional glass fiber in terms of chemical composition, production technology, and processing technology. The introduction of these components increases the high-temperature viscosity of the glass liquid and increases the working temperature of the glass kiln. Higher requirements are put forward for the perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/12
CPCC04B35/12C04B2235/9607C04B2235/77C04B2235/658C04B2235/3232C04B2235/404
Inventor 张永治耿可明李红霞王新福王晗胡飘吴爱军李坚强冯志源
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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