Method for prolonging service life of engine thermal barrier coating by controlling components of thermal growth oxide layer

A technology of thermally grown oxide layer and thermal barrier coating, applied in the direction of coating, metal material coating process, sustainable transportation, etc., can solve the problems of accelerated coating failure, affecting the continuity of thermally grown oxide layer, etc. The effect of extended service life

Inactive Publication Date: 2013-06-19
TIANJIN UNIV
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More critically, due to the selective oxidation of elements such as Ni and Co due to the high oxygen partial pressure or the formation of Al-depleted regions, the formed oxides and Al in TGO 2 o 3 A reaction occurs to form a spinel phase (Spinel), which affec

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for prolonging service life of engine thermal barrier coating by controlling components of thermal growth oxide layer
  • Method for prolonging service life of engine thermal barrier coating by controlling components of thermal growth oxide layer
  • Method for prolonging service life of engine thermal barrier coating by controlling components of thermal growth oxide layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Clean the base alloy with a mixture of ethanol and acetone (1:1 volume ratio), and roughen the surface of the base alloy by sandblasting, and fully dry it. Then supersonic flame spraying is used to prepare a bonding layer with a thickness of 150 μm and a composition of Co-32Ni-21Cr-8Al-0.5Y on the base alloy. The process parameters are: O 2 Air pressure and flow are 0.7MPa and 12m respectively 3 / h, propane gas pressure and flow are 0.6MPa and 1.0m respectively 3 / h, powder feeding gas N 2 The pressure and flow are 0.6MPa and 0.96m respectively 3 / h, the powder feeding amount is 35g / min, and the spraying distance is 300mm. Subsequent atmospheric plasma spraying of the ceramic layer ZrO 2 -8%Y 2 o 3 (wt.%), the thickness is 200μm, the process parameters are: spraying power is 42Kw, spraying voltage is 70V, spraying current is 600A, powder feeding rate is 35g / min, gun speed is 500mm / s, Ar gas pressure and flow rate respectively 0.6MPa and 40L / min, H 2 The air pres...

Embodiment 2

[0048] Example 2: The thermal spraying parameters used in preparing the thermal barrier coating in this example are the same as those in Example 1.

[0049] The process parameters of the vacuum heat treatment are also the same as those in Example 1, but heated to 1000° C. in the air environment, and heat-preserved and diffused for 10 hours. The thermal barrier coating sample prepared by the present invention is subjected to thermal shock, and the thermal shock process parameters are the same as in Example 1, and are the same as those in Example 1. Figure 4 and Figure 5 compared to, Image 6 After 100 thermal shocks of the coating, the peeling degree was further reduced.

Embodiment 3

[0050] Example 3: The thermal spraying parameters used in the preparation of the thermal barrier coating in this example are the same as those in Example 1.

[0051] The process parameters of the vacuum heat treatment are also the same as those in Example 1, but heated to 1100° C. in the air environment, and heat-preserved and diffused for 10 hours. The thermal barrier coating sample prepared by the present invention is subjected to thermal shock, and the thermal shock process parameters are the same as in Example 1, and are the same as those in Example 1. Figure 4 , Figure 5 with Image 6 compared to, Figure 7 After 100 times of thermal shock, the degree of spalling of the coating is the lowest.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for prolonging service life of an engine thermal barrier coating by controlling components of a thermal growth oxide layer. The thermal barrier coating utilizes high velocity oxy-fuel spray to prepare a bonding layer, utilizes low-energy power or high-energy power of atmospheric plasma to spray on a ceramic layer, then a combined technology of vacuum heat treatment and atmospheric diffusion heat treatment is carried out on the thermal barrier coating to restrain a premature appearance of spinel so that an edge of the thermal barrier coating is mainly alumina. Materials with a specific orientation of large grains are formed at the interface position of the alumina and the bonding layer to prevent oxygen from further largely intruding into the bonding layer and a base metal in a high-temperature service process. And the high-temperature service life of the thermal barrier coating is improved.

Description

technical field [0001] The present invention relates to a class of methods for improving the service life of thermal barrier coating technology for aero-engines or land-use gas turbines, and more particularly, to controlling the oxygen partial pressure in the pre-heat treatment environment of thermal barrier coatings and utilizing specific mechanisms of aluminum element diffusion Intervene and control the composition and structure of the thermal growth oxide layer, thereby indirectly prolonging the high-temperature service life of the thermal barrier coating. Background technique [0002] Under the international background of the global energy crisis and the establishment of a green environment, aviation turbine engines and land gas turbines are developing towards high flow ratio, high thrust-to-weight ratio and high turbine inlet temperature. One of the ways to increase the efficiency of an engine is to increase the temperature of the engine inlet gas. However, as the serv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C4/18
CPCY02T50/60
Inventor 韩玉君陆冠雄刘彻郝立军叶福兴
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap