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Lanthanum oxide-aluminum oxide composite coating prepared by plasma spraying method

A composite coating and alumina technology, applied in the field of wear-resistant ceramic coatings, can solve problems such as heavy test workload, increased coating preparation cost, and complicated coating preparation process

Active Publication Date: 2008-10-08
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there are more than 50 factors influencing the plasma spraying process and interacting with each other, the workload of the experiment is large and it is difficult to obtain an optimized process
Although post-treatment means such as dipping sealing and laser remelting can effectively reduce porosity, improve coating density and thermal and mechanical properties (M.Vippola, S.Ahmaniemi, J.Keranen, et al., Mater.Sci. Eng.A, 2002, 32: 1-8), but it also makes the coating preparation process complicated, and the coating preparation cost increases

Method used

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  • Lanthanum oxide-aluminum oxide composite coating prepared by plasma spraying method
  • Lanthanum oxide-aluminum oxide composite coating prepared by plasma spraying method
  • Lanthanum oxide-aluminum oxide composite coating prepared by plasma spraying method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The alumina and lanthanum oxide powders were weighed according to the mass percentage of lanthanum oxide as 3%, and the zirconia balls with a diameter of 3 mm were weighed according to the ball-to-powder ratio of 1 / 3, put into a ball mill bottle together, and dry mixed on a ball mill. 2 hours to make Al with 3%, 5% and 10% lanthanum oxide mass percentage 2 O 3 -La 2 O 3 Compound powder. Using atmospheric plasma spraying technology and controlling process parameters according to Table 1, composite coating and pure alumina coating were sprayed on the surface of the cleaned and sandblasted stainless steel friction disc with a size of Φ50×Φ6.5×8mm. from Figure 5 It can be seen that under the same process conditions, the thickness of the lanthanum oxide rare earth-doped composite coating is 20-35% higher than that of the pure alumina coating, and the increase in the thickness of the deposited coating reflects that the addition of rare earth lanthanum oxide greatly incre...

Embodiment 2

[0028] The alumina and lanthanum oxide powders were weighed according to the mass percentage of lanthanum oxide as 5%, and then the zirconia balls with a diameter of 3 mm were weighed according to the ball-to-powder ratio of 1 / 3, put into a ball milling bottle together, and dry mixed on a ball mill 2 hours to make Al with 3%, 5% and 10% lanthanum oxide mass percentage 2 O 3 -La 2 O 3 Compound powder. Using atmospheric plasma spraying technology and controlling process parameters according to Table 1, composite coating and pure alumina coating were sprayed on the surface of the cleaned and sandblasted stainless steel friction disc with a size of Φ50×Φ6.5×8mm. from Figure 5 It can be seen that under the same process conditions, the thickness of the lanthanum oxide rare earth-doped composite coating is 20-35% higher than that of the pure alumina coating, and the increase in the thickness of the deposited coating reflects that the addition of rare earth lanthanum oxide greatl...

Embodiment 3

[0030] The mass percentage of lanthanum oxide is 10%

[0031] Weigh the alumina and lanthanum oxide powders, and then weigh the zirconia balls with a diameter of 3 mm according to the ball-to-powder ratio of 1 / 3, put them into a ball mill bottle together, and dry mix them on a ball mill for 2 hours to make lanthanum oxide with a quality of 100%. Al content of 3%, 5% and 10% 2 O 3 -La 2 O 3 Compound powder. Using atmospheric plasma spraying technology and controlling process parameters according to Table 1, composite coating and pure alumina coating were sprayed on the surface of the cleaned and sandblasted stainless steel friction disc with a size of Φ50×Φ6.5×8mm. from Figure 5It can be seen that under the same process conditions, the thickness of the lanthanum oxide rare earth-doped composite coating is 20-35% higher than that of the pure alumina coating, and the increase in the thickness of the deposited coating reflects that the addition of rare earth lanthanum oxide ...

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Abstract

The invention relates to a lanthanum oxide and aluminum oxide composite coating layer which are prepared by adopting a plasma spraying method and the preparation method thereof, which belongs to the abrasion proof ceramic coating layer field. Aluminum oxide power and lanthanum oxide power are weighed as per the 3 / 97 to 10 / 90 proportion of lanthanum oxide and aluminum oxide and then are mixed by ball milling; composite power is deposited on the cleaned and blasted metal basis material by adopting the plasma spraying process. The microstructure analysis of the lanthanum oxide and aluminum oxide composite coating layer prepared by the invention shows that the lanthanum element is uniformly dispersed on the basal body of the aluminum oxide, compared with the spraying pure Al2O3 coating layer, a plasma spraying Al2O3-La2O3 coating layer has higher deposition efficiency, and the wear resistant of the plasma spraying coating layer is effectively improved.

Description

technical field [0001] The invention relates to a lanthanum oxide-alumina composite coating prepared by a plasma spray method and a preparation method thereof, and belongs to the field of wear-resistant ceramic coatings. Background technique [0002] As an excellent wear-resistant coating, plasma sprayed alumina coating has been well used in the fields of machinery, chemical industry, papermaking and so on. However, on the one hand, the inherent brittleness of ceramic materials and the process characteristics of thermal spraying technology determine the low deposition efficiency and porous structure characteristics of alumina coatings, which largely restrict the further application of coatings in the field of wear resistance On the other hand, with the rapid development of science and technology, higher requirements have been put forward for the application environment of coating materials. Therefore, how to improve the structure and wear resistance of plasma sprayed alumin...

Claims

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Application Information

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IPC IPC(8): C23C4/10C23C4/11C23C4/134
Inventor 尹志坚陶顺衍周霞明丁传贤
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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