Processing method for dipping graphite carbon envelope with oxide solution

A technology of graphite carbon and solution, which is applied in the fields of wear-resistant graphite materials and oxidation resistance, and can solve problems such as the reduction of surface hardness and mechanical strength, the quality of silicon steel sheets, and the impact on production

Inactive Publication Date: 2007-07-11
NANTONG QINGTIAN INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hearth roll sleeves for continuous annealing furnaces for cold-rolled silicon steel sheets - graphite carbon sleeves, due to O 2 、H 2 Corrosion of O and other oxidizing gases leads to defects such as loose surface structure of graphite carbon sleeves, greatly reduced surface hardness and mechanical strength, and easy nodulation of graphite carbon sleeves.
Affect the normal production, increase the production cost, reduce the quality of silicon steel sheet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: After the green body produced according to the raw material formula is precisely processed, it is placed in a dipping tank and vacuumed to -0.095 ~ 0.085Mpa for 0.5 ~ 1 hour, and then injected into the prepared Al 2 o 3 , SiO 2 Mixture colloidal solution, the mass percentage concentration is 24%, pressurized to 0.5-0.7Mpa, hold the pressure for 3-4 hours, take out and dry, then undergo high-temperature treatment at 550-800°C, clean and polish the surface to obtain the finished graphite carbon sleeve.

Embodiment 2

[0016] Example 2: After the green body produced according to the raw material formula is precisely processed, it is placed in a dipping tank and evacuated to -0.095-0.085Mpa for 0.5-1 hour, and then injected into the prepared Al 2 o 3 、TiO 2 Mixture colloidal solution, the mass percentage concentration is 24%, pressurized to 0.5-0.7Mpa, hold the pressure for 3-4 hours, take out and dry, then undergo high-temperature treatment at 550-800°C, clean and polish the surface to obtain the finished graphite carbon sleeve.

Embodiment 3

[0017] Example 3: After the green body produced according to the raw material formula is precisely processed, it is placed in a dipping tank and evacuated to -0.095 ~ 0.085Mpa for 0.5 ~ 1 hour, and then injected into the prepared Al 2 o 3 , SiO 2 、TiO 2 Mixture colloidal solution, the mass percentage concentration is 24%, pressurized to 0.5-0.7Mpa, hold the pressure for 3-4 hours, take out and dry, then undergo high-temperature treatment at 550-800°C, clean and polish the surface to obtain the finished graphite carbon sleeve.

[0018] Effect of the present invention:

[0019] After the impregnation treatment, the graphite carbon sleeve was subjected to oxidation and corrosion tests in different temperature regions, and the effects are as follows:

[0020]

[0021] It can be seen from the above test results that the service life of the graphite carbon sleeve treated by the present invention is greatly extended compared with that of the unimpregnated graphite carbon...

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Abstract

The invention discloses an oxidation and abrasion resistant graphite material, which is characterized by the following: leaching oxide solution of graphite carbon sleeve in the cold-rolling silicon sheet continuous annealing furnace and other heat disposal furnace; improving oxidation and abrasion resistance for graphite carbon sleeve; making Al2O3, SiO2 and TiO2 into hyperfine powder; allocating; dispersing in the solution to make gel solution; adopting vacuum pressurizing leaching method to immerse oxide solution into graphite carbon sleeve; forming ceramic protecting film on the blank surface.

Description

Technical field: [0001] The invention belongs to oxidation-resistant and wear-resistant graphite materials, and relates to an oxide solution immersion treatment method for graphite carbon sleeves used in continuous annealing furnaces for cold-rolled silicon steel sheets and other heat treatment furnaces. Background technique [0002] Hearth roll sleeves for continuous annealing furnaces for cold-rolled silicon steel sheets - graphite carbon sleeves, due to O 2 、H 2 The corrosion of O and other oxidizing gases leads to defects such as loose surface structure of the graphite carbon sleeve, a substantial decrease in surface hardness and mechanical strength, and easy nodulation of the graphite carbon sleeve. It affects the normal progress of production, increases the production cost, and reduces the quality of silicon steel sheets. It is the key to solve the above problems to improve the anti-oxidation and anti-wear properties of graphite carbon sleeves by adopting suitable im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/622C04B41/85C21D1/00C21D9/56
Inventor 杨晓智顾玉琪李志宏苏语诚刘明尤小勇谢纯霸陈新
Owner NANTONG QINGTIAN INDAL
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