Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing Al-Si-Cr coat by low-voltage plasma spraying

A low-pressure plasma and plasma technology, used in coatings, metal material coating processes, melting spray plating, etc., can solve problems such as limiting high-temperature applications, and achieve the effect of improving high-temperature oxidation resistance

Inactive Publication Date: 2009-06-03
BEIHANG UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Al, Cr, and Si are combined to form many compounds. These compounds have good high-temperature oxidation resistance, but some compounds are affected by their melting points, which limits their high-temperature applications.

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 preparing Al-Si-Cr coat by low-voltage plasma spraying
  • Method for preparing Al-Si-Cr coat by low-voltage plasma spraying

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The present invention is a low pressure 30 ~ 40 × 10 3 Pa plasma spraying prepares the method for Al-Si-Cr coating, and this coating preparation method has the following steps:

[0024] The first step: pretreatment of the substrate

[0025] Polish the Nb-24Ti-16Si-6Al-6Cr-2Hf substrate with 150#, 360# and 500# water abrasive paper, and use a sandblasting machine to perform surface blasting treatment before use. After sandblasting, the substrate surface roughness RZ= 60~80μm;

[0026] Step 2: Prepare coating materials

[0027] (A) Weigh 30-35wt% of Al powder, 30-33wt% of Cr powder, 32-40wt% of Si powder, and the sum of the contents of the above-mentioned components is 100%, and grind for 30-150min after mixing Obtain the first mixed powder with a particle size of 250-350 mesh;

[0028] (B) mixing the first mixed powder prepared in step (A) with a binder and grinding for 250-400 minutes to obtain a second mixed powder with a particle size of 250-350 mesh;

[0029] Th...

Embodiment 1

[0039] The first step: pretreatment of the substrate

[0040] Cut the Nb-24Ti-16Si-6Al-6Cr-2Hf substrate into a rectangular sample with a length of 13mm, a width of 8mm, and a height of 3mm, and after polishing with 150#, 360# and 500# water abrasive paper, use a sandblasting machine to spray the surface After sand treatment, it is ready for use, and the surface roughness of the substrate after sandblasting is RZ=60~80μm;

[0041] Step 2: Prepare coating materials

[0042] (A) Weighing 33.3wt% of Al powder, 32.1wt% of Cr powder, and 34.6wt% of Si powder were mixed and ground for 100 minutes to obtain the first mixed powder with a particle size of 250 to 350 mesh;

[0043] (B) mixing the first mixed powder prepared in step (A) with a binder and grinding for 300 minutes to obtain a second mixed powder with a particle size of 250-350 mesh;

[0044] The amount of the first mixed powder and binder is 1000g of the first mixed powder put into 1000ml of binder;

[0045] The binder ...

Embodiment 2

[0056] The first step: pretreatment of the substrate

[0057] Cut the Nb-24Ti-16Si-6Al-6Cr-2Hf substrate into a rectangular sample with a length of 13mm, a width of 8mm, and a height of 3mm, and after polishing with 150#, 360# and 500# water abrasive paper, use a sandblasting machine to spray the surface After sand treatment, it is ready for use, and the surface roughness of the substrate after sandblasting is RZ=60~80μm;

[0058] Step 2: Prepare coating materials

[0059] (A) Weighing 30wt% of Al powder, 30wt% of Cr powder, and 40wt% of Si powder and mixing them and grinding for 150 minutes to obtain the first mixed powder with a particle size of 250 to 350 meshes;

[0060] (B) mixing the first mixed powder prepared in step (A) with a binder and grinding for 400 minutes to obtain a second mixed powder with a particle size of 250-350 mesh;

[0061] The amount of the first mixed powder and binder is 1500ml of binder put into the first mixed powder of 1000g;

[0062] The bind...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
surface roughnessaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing the AL-Si-Cr coat by utilizing the low voltage plasma spray coating. The method comprises the steps as follow: the AL-Si-Cr coat is made on the Nb-24Ti-16Si-6Al-6Cr-2Hf base body by utilizing the plasma spray coating technique with low voltage of 30 to 40 multiplied by 103 pa, which shapes an inter-diffusion layer that is 5-15Mum between a base body and a coat; the Al-Si-Cr coat can shape continue and compact Al2O3 and SiO2 mixed oxide layer when oxidized under high temperature of 1000 to 1250 DEG C, thereby stopping the coat and the base body from being further oxidized and improving the anti high temperature oxidization property of the Nb-24Ti-16Si-6Al-6Cr-2Hf base body; and the unit area weight of the surface of the base body which is provided with a coat is increased to 506 to 16.8 milligram per square centimeter. The Al-Si-Cr coat consists of a mixing layer and an inter-diffusion layer, wherein, the Al-Si-Cr mixing layer comprises the following three phases: Cr (Si, Al) 2, Al and Si; and the inter-diffusion layer comprises the elements as follow: Nb, Ti, Si, Al and Cr.

Description

technical field [0001] The present invention relates to a kind of preparation method of coating, more particularly, refers to a method using low pressure (30~40×10 3 Pa) Al-Si-Cr coating with high temperature (1000-1250°C) oxidation resistance was prepared on Nb-24Ti-16Si-6Al-6Cr-2Hf substrate by plasma spraying method. Background technique [0002] The high development of aerospace technology requires the engine to have a higher thrust-to-weight ratio and work efficiency, which requires the engine to have a higher operating temperature. It is imperative to develop materials to replace the existing nickel-based superalloys as ultra-high temperature components of future aircraft engines. Nb ss / Nb 5 Si 3 The in-situ composite material has high melting point (>1700℃), high stiffness, low density (7.1~8.4g / cm 3 ) and extremely high-temperature strength have attracted much attention in recent years. Nb-based solid solution (Nb ss ) has good room temperature toughness. ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/02C23C4/134
Inventor 周春根姚登樽蔡锐张虎徐惠彬
Owner BEIHANG UNIV