Preparation technology of spherical chromium oxide composite agglomerated powder, and product prepared by preparation process

A preparation process and technology of chromium oxide, applied in the direction of chromium oxide/hydrate, coating, etc., can solve the problems affecting the comprehensive performance of chromium oxide coating, segregation of chromium oxide coating, uneven distribution of chemical components, etc. Guaranteed sphericity and compactness, inhibiting valence changes, and good compactness

Active Publication Date: 2020-09-15
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the distribution of chemical components in the chromium oxide powder prepared by this process is not uniform. When the chromium oxide powder is used for spray coating, the obtained chromium oxide coating will be partially segregated, which will affect the comprehensiveness of the chromium oxide coating. performance

Method used

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  • Preparation technology of spherical chromium oxide composite agglomerated powder, and product prepared by preparation process
  • Preparation technology of spherical chromium oxide composite agglomerated powder, and product prepared by preparation process
  • Preparation technology of spherical chromium oxide composite agglomerated powder, and product prepared by preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A preparation process of spherical chromium oxide composite agglomerated powder comprises the following steps:

[0045] (1), Dissolve chromium nitrate in deionized water, then add SiO in the solution 2 Nano powder and TiO 2 Nano powder (wherein, the concentration of chromium nitrate solution is 2mol / L, SiO 2 、TiO 2 The mass ratio of chromium nitrate and chromium nitrate is 4.5:3:289.7), ultrasonic treatment, to obtain a mixed solution; add ammonia water drop by drop to the mixed solution, adjust the pH value of the solution to 9, and obtain SiO 2 Nano powder and TiO 2 Nano-powder is the coated precursor of the core, filtered and dried to obtain a solid product;

[0046] (2), the solid product prepared in step (1) and the polystyrene accounting for 15% of the solid product weight are formulated with deionized water into a slurry with a solid content of 55%, and the configured slurry is sprayed into granulation Tower, through spray granulation combined with atmospher...

Embodiment 2

[0048] The difference between embodiment 2 and embodiment 1 is: in embodiment 2, the concentration of chromium nitrate solution is 1mol / L, SiO 2 、TiO 2 The mass ratio of chromium nitrate and chromium nitrate is 3:4:285, the pH value is adjusted to 8 after adding ammonia water dropwise, the solid content of the slurry is 50%, and the rest are consistent with Example 1.

Embodiment 3

[0050] The difference between embodiment 3 and embodiment 1 is: in embodiment 3, the concentration of chromium nitrate solution is 3mol / L, SiO 2 、TiO 2 The mass ratio to chromium nitrate is 5:2:297.5, the pH value is adjusted to 11 after adding ammonia water dropwise, the solid content of the slurry is 60%, and the rest are consistent with Example 1.

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Abstract

The invention discloses a preparation technology of spherical chromium oxide composite agglomerated powder, and a product prepared by the preparation process, and belongs to the technical field of composite powder materials. The preparation technology comprises the following steps: dissolving chromium nitrate in deionized water, adding SiO2 nano-powder and TiO2 nano-powder, dropwise adding ammoniawater to adjust the pH value of the solution to prepare a coated precursor with SiO2 nano-powder and TiO2 nano-powder as cores, filtering, and drying to obtain a solid product; and preparing the solid product into slurry by using deionized water, preparing spherical agglomerated powder by combining spray granulation with an atmosphere protection sintering process, and then carrying out particle size grading on the spherical agglomerated powder to prepare spherical chromium oxide composite agglomerated powder. The chromium oxide composite agglomerated powder with uniform chemical components and good sphericity, compactness, fluidity and the like can be prepared by adopting the preparation technology.

Description

technical field [0001] The invention relates to the technical field of composite powder materials, more specifically, it relates to a preparation process of spherical chromium oxide composite agglomerated powder and a product thereof. Background technique [0002] The chromium oxide composite powder material formed by adding an appropriate amount of silicon oxide and titanium oxide to the chromium oxide powder can improve the heating and melting characteristics of the chromium oxide powder during the spraying process, improve the process performance of the chromium oxide powder spraying, and improve the powder deposition efficiency and compatibility with the substrate. It is beneficial to improve the fracture toughness and post-processing performance of the chromium oxide coating. The chromium oxide composite powder material also has the characteristics of low friction coefficient, high thermal conductivity, and high hardness. It also has good chemical stability and excellen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C01G37/02
CPCC01G37/02C01P2004/03C01P2004/32C09D1/00
Inventor 贾芳冀晓鹃彭浩然沈婕张鑫卢晓亮原慷李杰
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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