High-temperature-resistant multi-component silicide coating on surface of niobium alloy and preparation method of high-temperature-resistant multi-component silicide coating

A multi-component, high-temperature-resistant technology, applied in metal material coating process, coating, heating inorganic powder coating, etc., can solve the problems of lack of compactness of coating structure, large internal stress of coating, loss of protective effect, etc. , to achieve the effects of improving high temperature oxidation resistance, reducing internal stress, and controlling tissue composition

Active Publication Date: 2018-12-18
CHINA UNIV OF MINING & TECH
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Problems solved by technology

At present, researchers have tried to use the spark plasma sintering process to prepare anti-oxidation coatings on the surface of niobium alloys, but the structure of the coatings is lacking in compactness, and there is a large internal stress in the coatings, and large cracks are easily formed during the high-temperature oxidation process. Cracks, or even serious coating chipping, thus losing the protective effect

Method used

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  • High-temperature-resistant multi-component silicide coating on surface of niobium alloy and preparation method of high-temperature-resistant multi-component silicide coating
  • High-temperature-resistant multi-component silicide coating on surface of niobium alloy and preparation method of high-temperature-resistant multi-component silicide coating
  • High-temperature-resistant multi-component silicide coating on surface of niobium alloy and preparation method of high-temperature-resistant multi-component silicide coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: preparation [(Nb 0.75 Ti 0.05 Cr 0.2 ) 0.95 ,W 0.05 ] Si 2 coating

[0025] (1) Firstly, according to Mole ratio [(Nb 0.75 Ti 0.05 Cr 0.2 ) 0.95 ,W 0.05 ]:Si=1:2.03 ratio, weigh each metal elemental powder and silicon elemental powder respectively, drop into the mixing machine and fully mix for 12h;

[0026] (2) Embed the niobium alloy workpiece with the mixed multi-element metal powder and place it in a graphite crucible, and then put the graphite crucible into a spark plasma sintering furnace for sintering. The specific process parameters are: the heating rate is 100°C / s, the pressure is 30MPa, and it is sintered at 1400℃ for 5min;

[0027] (3) Homogenize the sintered coating sample in an argon protective atmosphere at a temperature of 1100°C for 4 hours to obtain a composite material mainly composed of (Nb-Ti-Cr)Si 2 and a small amount of WSi 2 Composed of [(Nb 0.75 Ti 0.05 Cr 0.2 ) 0.95 ,W 0.05 ] Si 2 The coating has a uniform struc...

Embodiment 2

[0028] Embodiment 2: preparation [(Nb0.75 Ti 0.05 Cr 0.2 ) 0.8 ,W 0.2 ]Si 2 coating

[0029] (1) Firstly, according to Mole ratio [(Nb 0.75 Ti 0.05 Cr 0.2 ) 0.8 ,W 0.2 ]:Si=1:2.03 ratio, take each metal elemental powder respectively, drop into the mixing machine and fully mix for 18h;

[0030] (2) Embed the niobium alloy workpiece with the mixed multi-element metal powder and place it in a graphite crucible, and then put the graphite crucible into a spark plasma sintering furnace for sintering. The specific process parameters are: the heating rate is 100°C / s, the pressure is 30MPa, and it is sintered at 1450℃ for 5min;

[0031] (3) Homogenize the sintered coating sample in an argon protective atmosphere at a temperature of 1150°C for 4 hours to obtain a composite material mainly composed of (Nb-Ti-Cr)Si 2 and WSi 2 Composed of [(Nb 0.75 Ti 0.05 Cr 0.2 ) 0.8 , W 0.2 ] Si 2 The coating has a uniform structure and is combined with the substrate in a metallurgic...

Embodiment 3

[0032] Embodiment 3: preparation [(Nb 0.75 Ti 0.05 Cr 0.2 ) 0.6 ,W 0.4 ]Si 2 coating

[0033] (1) Firstly, according to Mole ratio [(Nb 0.75 Ti 0.05 Cr 0.2 ) 0.6 ,W 0.4 ]:Si=1:2.03 ratio, take each metal elemental powder respectively, drop into the mixing machine and fully mix 24h;

[0034] (2) Embed the niobium alloy workpiece with the mixed multi-element metal powder and place it in a graphite crucible, and then put the graphite crucible into a spark plasma sintering furnace for sintering. The specific process parameters are: the heating rate is 100°C / s, the pressure is 30MPa, and it is sintered at 1450℃ for 5min;

[0035] (3) Homogenize the sintered coating sample in an argon protective atmosphere at a temperature of 1200°C for 4 hours to form a high temperature resistant multi-component silicide coating.

[0036] [(Nb 0.75 Ti 0.05 Cr 0.2 ) 0.6 ,W 0.4 ]Si 2 The surface of the coating is tested and analyzed, the results are as follows figure 1 shown.

[...

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Abstract

The invention discloses a high-temperature-resistant multi-component silicide coating on the surface of niobium alloy and a preparation method of the high-temperature-resistant multi-component silicide coating. The high-temperature-resistant multi-component silicide coating has the phase composition of [(Nb(1-x-y)TixCry)(1-z),Rz]Si2, wherein R is one or more of the metal elements of Mo, W, Zr, Hfand Ta; x, y and z respectively represent mole numbers of the corresponding elements; 0.05<=x<=0.2; 0.05<=y<=0.3; and 0.05<=z<=0.4. The preparation method comprises the following steps: first, metal elementary powder and silicon elementary powder are weighed and thrown into a mixer to be fully mixed for 12-24 h; the mixed multi-component metal powder covers a niobium alloy workpiece, then, the covered niobium alloy workpiece is placed in a graphite crucible, and the graphite crucible is placed in a discharge plasma sintering furnace for sintering; and a sample of the sintered coating is subjected to homogenization heat treatment in a vacuum or protective atmosphere. The invention provides the discharge plasma sintering and homogenization heat treatment compounded preparation process. The process is simple. The coating structure is homogeneous. Ingredients are controllable. The coating has favorable high-temperature oxidation resistance at 1,200-1,600 DEG C.

Description

technical field [0001] The invention relates to a high-temperature anti-oxidation coating on the surface of a metal material and a preparation method thereof, in particular to a high-temperature-resistant coating on the surface of a niobium alloy and a preparation method thereof. Background technique [0002] Because of its high melting point, low density and good high and low temperature mechanical properties, niobium alloy is considered to be an important candidate material for high temperature structural parts in aviation, aerospace and nuclear industries, but its oxidation resistance is poor, and protective coatings are prepared on the surface It is the most effective way to improve the oxidation resistance of niobium alloys. Silicide coating is the most suitable high-temperature oxidation-resistant coating system for niobium alloys. [0003] At present, there are two main systems of niobium alloy high-temperature oxidation-resistant silicide coatings at home and abroad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08C04B35/58C04B35/622C04B35/64C04B35/65
CPCC04B35/58092C04B35/62222C04B35/64C04B35/65C04B2235/404C04B2235/428C04B2235/661C04B2235/666C23C24/085
Inventor 张平冯培忠陈正沈承金任宣儒
Owner CHINA UNIV OF MINING & TECH
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