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

Two-step preparation method for Y and Al modified silicide infiltrated layer on surface of Nb-Si-based alloy

A technology of silicide and base alloy, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of waste of resources, efficiency, and reduction, and achieve process controllability, simple process, and strong practicability Effect

Inactive Publication Date: 2014-08-20
NORTHWESTERN POLYTECHNICAL UNIV
View PDF2 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the embedded co-infiltration method is used to prepare the Y and Al modified silicide infiltrated layer, in order to obtain the infiltrated layer with the designed structure, the ratio between the infiltrated element powders in the infiltrated agent and other process parameters (such as temperature and time, etc.), even if the thermodynamic calculation of the co-infiltration process can be performed with the help of software such as ChemSage or Thermo-Cacl before the experiment to optimize its parameters in advance, but due to the diffusion of various elements and the thermodynamics of phase formation in the subsequent preparation process, Due to the difference between dynamics, multiple experiments are still needed to determine the optimal conditions of multi-component co-infiltration, which leads to the waste of resources and the reduction of benefits in practical engineering 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
  • Two-step preparation method for Y and Al modified silicide infiltrated layer on surface of Nb-Si-based alloy
  • Two-step preparation method for Y and Al modified silicide infiltrated layer on surface of Nb-Si-based alloy
  • Two-step preparation method for Y and Al modified silicide infiltrated layer on surface of Nb-Si-based alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step One, Si-Y 2 o 3 Preparation of Y-modified silicide infiltration layer by co-infiltration: (a) smooth the surface of the alloy sample with 80-1200# SiC water sandpaper, ultrasonically clean it in alcohol for 10 minutes, and then dry it with cold air for later use; (b) 15% by weight Si-3%Y 2 o 3 -6%NaF-76%Al 2 o 3 To weigh and prepare the penetrating agent, then mix it evenly and put it into a ball milling tank for 3.5 hours of ball milling at 250 rpm; (c) put half of the ball-milled penetrating agent into a corundum crucible and compact it, put Put the sample treated in step (a), cover it with another semi-infiltrating agent and compact it again, the thickness of the infiltrating agent covered on the surface of the sample is not less than 10mm, then cover the crucible lid and use Al 2 o 3 Powder and silica sol prepared slurry seal, the proportion of the slurry is 50g Al 2 o 3 Add 20ml of silica sol to the powder; (d) Place the sealed crucible in an embedding...

Embodiment 2

[0041] Step One, Si-Y 2 o 3 Co-infiltration to prepare Y-modified silicide infiltration layer: (a) smooth the surface of the alloy sample with 80-1200# SiC water sandpaper, ultrasonically clean it in alcohol for 10 minutes, and then dry it with cold air for later use; (b) use 10% by weight Si-2%Y 2 o 3 -5%NaF-83%Al 2 o 3 to weigh and prepare the penetrating agent, and then mix it evenly and put it into a ball mill jar for 4 hours of ball milling at 200 rpm; (c) put half of the ball milled penetrating agent into a corundum crucible and compact it, put The sample treated in step (a) is covered with another semi-infiltrating agent and compacted again. The thickness of the infiltrating agent covered on the surface of the sample is not less than 10mm, and then the crucible is covered and covered with Al 2 o 3 Powder and silica sol prepared slurry seal, the proportion of the slurry is 50g Al 2 o 3 Add 20ml of silica sol to the powder; (d) Place the sealed crucible in an embe...

Embodiment 3

[0045] Step One, Si-Y 2 o 3 Preparation of Y-modified silicide infiltration layer by co-infiltration: (a) smooth the surface of the alloy sample with 80-1200# SiC water sandpaper, ultrasonically clean it in alcohol for 10 minutes, and then dry it with cold air for later use; (b) 20% by weight Si-2%Y 2 o 3 -5%NaF-73%Al 2 o 3 to weigh and prepare the penetrating agent, and then mix it evenly and put it into a ball mill jar for 4 hours of ball milling at 200 rpm; (c) put half of the ball milled penetrating agent into a corundum crucible and compact it, put The sample treated in step (a) is covered with another semi-infiltrating agent and compacted again. The thickness of the infiltrating agent covered on the surface of the sample is not less than 10mm, and then the crucible is covered and covered with Al 2 o 3 Powder and silica sol prepared slurry seal, the proportion of the slurry is 50g Al 2 o 3 Add 20ml of silica sol to the powder; (d) Place the sealed crucible in an e...

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
Login to View More

Abstract

The invention relates to a two-step preparation method for a Y and Al modified silicide infiltrated layer on the surface of an Nb-Si-based alloy. The method for two-step preparation of the Y and Al modified silicide infiltrated layer on the surface of the novel Nb-Si-based alloy comprises the following steps: preparing a Y modified silicide infiltrated layer on the surface of the alloy by using Si-Y2O3 co-infiltration; and then on the basis that the formed structure of the silicide infiltrated layer is not changed, carrying out subsequent Al-Y2O3 co-infiltration so as to obtain the Y and Al modified silicide infiltrated layer. The method has the following advantages: the silicide infiltrated layer with the expected structure and thickness can be prepared on the surface of the alloy at first, subsequent Al-Y2O3 co-infiltration realizes addition of a proper amount of Al and Y on the premise that structural integrity of the silicide infiltrated layer is not destroyed, and preparation technology is simple and controllable; the method has operability on actual workpiece with complex shapes, so the method has good practicality.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy thermal protection, and in particular relates to a two-step method for preparing a Y- and Al-modified silicide infiltrated layer on the surface of an Nb-Si-based alloy. Background technique [0002] Nb-Si-based alloys are considered to be important candidate materials for high-temperature structural parts in aviation, aerospace and nuclear industries due to their high melting point, low density and good high-low temperature mechanical properties. Compared with traditional Nb alloys (such as C103, Nb521, etc.) and simple Nb-Si binary alloys, the strength and toughness of new Nb-Si-based alloys after multi-alloying (addition of Ti, Cr, Hf and Al, etc.) are close to engineering However, its high-temperature oxidation resistance is still far from the requirements for high-temperature structural materials, and has become a key problem hindering its application. Preparing a protective co...

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): C23C12/00
Inventor 郭喜平张平
Owner NORTHWESTERN POLYTECHNICAL UNIV