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

Al2O3/Al-Si-Cr composite coatings and preparation method thereof

A composite coating, al-si-cr technology, applied in coating, metal material coating process, layered products, etc., can solve the problem of restricting high temperature application and achieve the effect of improving high temperature oxidation resistance

Inactive Publication Date: 2009-08-05
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
  • Al2O3/Al-Si-Cr composite coatings and preparation method thereof
  • Al2O3/Al-Si-Cr composite coatings and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The present invention is a low pressure 30 ~ 40 × 10 3 Preparation of Al by pa plasma spraying 2 o 3 / Al-Si-Cr composite coating method, the coating preparation method has the following steps:

[0014] The first step: pretreatment of the substrate

[0015] Polish the Nb-24Ti-16Si-6Al-6Cr-2Hf substrate with 150#, 360#, 500# water abrasive paper, and use a sandblasting machine to perform surface blasting treatment before use. After blasting, the substrate surface roughness RZ= 60~80μm;

[0016] The second step: preparation of Al-Si-Cr coating material

[0017] (A) Weigh 30-35wt% of Al powder, 30-33wt% of Cr powder, 32-40wt% of Si powder, and the sum of the content of the above-mentioned components is 100%, after mixing, grind for 30-150min to prepare Obtain the first mixed powder with a particle size of 250-350 mesh;

[0018] (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 p...

Embodiment 1

[0032] The first step: pretreatment of the substrate

[0033] 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#, 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;

[0034] Step 2: Prepare coating materials

[0035] (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;

[0036] (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;

[0037] The amount of the first mixed powder and binder is 1000g of the first mixed powder put into 1000ml of binder;

[0038] The binder is ...

Embodiment 2

[0053] The first step: pretreatment of the substrate

[0054] 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#, 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;

[0055] Step 2: Prepare coating materials

[0056] (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;

[0057] (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;

[0058] The amount of the first mixed powder and binder is 1500ml of binder put into the first mixed powder of 1000g;

[0059] The binder ...

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 an Al2O3 / Al-Si-Cr composite coating, and the preparation of Al2O3 / Al-Si-Cr on a Nb-24Ti-16Si-6Al-6Cr-2Hf substrate by adopting a low-pressure 30-40×103Pa plasma spraying process Composite coating method. The Al2O3 / Al-Si-Cr composite coating consists of an Al2O3 coating and an Al-Si-Cr mixed layer, and the Al2O3 coating is formed on the Al-Si-Cr mixed layer and the Nb-24Ti-16Si-6Al-6Cr-2Hf substrate Between, the Al2O3 coating thickness is 50~200 μm, and the Al-Si-Cr mixed layer thickness is 50~200 μm; The Al-Si-Cr mixed layer in the described Al2O3 / Al-Si-Cr composite coating contains Cr(Si, Al)2, Al, Si three-phase, can form continuous, compact Al2O3 and SiO2 mixed oxide layer after being oxidized at high temperature 1000~1250 ℃ for 100h; The Al2O3 coating can effectively prevent Al-Si-Cr mixed coating The interdiffusion with the substrate improves the continuous anti-oxidation life of the coating.

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 with high temperature (1000-1250°C) oxidation resistance was prepared on Nb-24Ti-16Si-6Al-6Cr-2Hf substrate by plasma spraying method 2 o 3 / Al-Si-Cr composite coating. Background technique [0002] Niobium-based alloys have higher melting points (>1700°C), lower densities (6.6-7.2g / cm 3 ), good room temperature fracture toughness (>20Mpa m 1 / 2 ), good high-temperature strength and casting performance, so it is expected to become a blade material that works at 1200-1400 ° C or even higher temperatures. But Nb ss / Nb 5 Si 3 Duplex alloys have poor oxidation resistance, and serious oxidation weight gain occurs during high temperature oxidation. Formed oxides such as: TiNb 2 o 7 , AlNb 11 o 29 and CrNbO 4 It is loose and porous, and grows rapidly, which cannot prevent the continuous diffus...

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): B32B33/00B32B9/00C23C4/00C23C4/02C23C4/04C23C4/18B01D1/16B01J2/02C23C4/06C23C4/11C23C4/134
Inventor 周春根蔡锐姚登樽张虎徐惠彬
Owner BEIHANG UNIV