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Preparation method of compact chromium oxide product with high thermal shock resistance

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: 2017-05-31
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Preparation method of compact chromium oxide product with high thermal shock resistance
  • Preparation method of compact chromium oxide product with high thermal shock resistance
  • Preparation method of compact chromium oxide product with high thermal shock resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Selecting 325 mesh chromium oxide composite micropowder: Cr 2 O 3 Micro powder 86.0wt.%, TiO 2 Micropowder 4.0wt.%, metal zirconium powder 10.0wt.%, uniformly mixed with calcium lignosulfonate 1.0wt.% and polyvinyl alcohol 0.1Wt.% to make a slurry, centrifugal granulation, and press it into an electric furnace after 180MPa press In the kiln, 99.99% Ar gas is introduced into the kiln through the control of a flow meter to ensure a slight positive pressure of 10mm water column in the kiln to prevent outside air from entering the kiln, and then heat preservation at 1650°C for 2 hours to obtain high thermal shock stability. Sexually dense chromium oxide products. Comparative Example 1 is that a sample of the same specification prepared without metal zirconium powder is sintered at 1700°C for 2 hours in an air atmosphere. The comparison of the volume density, apparent porosity and thermal shock stability of their inner and outer regions is shown in Table 1.

[0021]...

Embodiment 2

[0023] Example 2: Selecting 325 mesh chromium oxide composite micropowder: Cr 2 O 3 Micropowder 93.0wt.%, TiO 2 Micropowder 4.0wt.%, metal zirconium powder 3.0wt.%, uniformly mixed with polyvinyl alcohol 1.0wt.%, slurry spray granulation, after 150MPa isostatic pressure molding, into the electric furnace kiln, controlled by the flow meter 99.999% Ar gas is introduced into the kiln. Observation ensures that there is a slight positive pressure of 10mm water column in the kiln to prevent outside air from entering the kiln. Then the high thermal shock stability compact chromium oxide product is sintered at 1450℃ for 8 hours. Comparative Example 2 is that a sample of the same specification prepared without metal zirconium powder is sintered at 1700°C for 8 hours in an air atmosphere. The comparison of the volume density, apparent porosity and thermal shock stability of their inner and outer regions is shown in Table 2.

[0024] Table 2

[0025]

Embodiment 3

[0026] Example 3: Selecting 325 mesh chromium oxide composite micropowder: Cr 2 O 3 Micropowder 95.0wt.%, TiO 2 Micropowder 4.0wt.%, metal zirconium powder 1.0wt.%, uniformly mixed with carboxymethyl cellulose powder 0.1wt.% and polyvinyl alcohol 0.1Wt.% to make a slurry, centrifuge and granulate, then press and form with a 150MPa machine before filling In the electric furnace kiln, 99.999% Ar gas is introduced into the kiln through the control of a flow meter. Observe to ensure that the kiln has a 10mm water column with a slight positive pressure to prevent outside air from entering the kiln. The high heat is then sintered at 1550℃ for 4 hours. Shock stable compact 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 comparison of the volume density, apparent porosity and thermal shock stability of their inner and outer regions is shown in Table...

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Abstract

The invention belongs to the technical field of refractory materials, and provides a preparation method of a compact chromium oxide product with high thermal shock resistance. According to the preparation method of the compact chromium oxide product with the high thermal shock resistance, the raw material of the chromium oxide product is composite chromium oxide micro-powder with the particle size of less than or equal to 45mu m; the composite chromium oxide micro-powder is prepared from chromium oxide micro-powder, titanium oxide micro-powder and a bonding agent. The preparation method comprises the steps of adding metal Zr micro-powder into the composite chromium oxide micro-powder; homogenizing and granulating the composite chromium oxide micro-powder to obtain a chromium oxide green body; replenishing an electric furnace, which contains the chromium oxide green body, with high-purity inert gas Ar; when the temperature is 1450-1650 DEG C, carrying out heat preservation for 2-8h, and sintering to obtain the compact chromium oxide product which is high in thermal shock resistance and has the chromium oxide content of more than 86%. The preparation method of the compact chromium oxide product with the high thermal shock resistance solves the problems that the compact chromium oxide product is great in density gradient difference of an inside body and an outside body, poor in thermal shock resistance, and the like, guarantees the uniformity of an internal structure of the compact chromium oxide product, and improves the sintering properties and use performance of large compact chromium products.

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 in the alkali-free glass fiber industry, internal reduction and low oxygen partial pressure sintering, and specifically relates to a high thermal shock stability Preparation method of dense chromium oxide products. Background technique [0002] As the application environment becomes more and more demanding, alkali-free glass fiber generally introduces such as Al 2 O 3 , B 2 O 3 And other components such as BaO, which are different from traditional glass fiber in chemical composition, production technology, processing technology, etc. The introduction of these components increases the high temperature viscosity of the glass liquid, increases the working temperature of the glass furnace, and improves the lining of the glass furnace. The use of refracto...

Claims

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Application Information

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Patent Type & Authority Applications(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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