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Aluminizing agent and method for preparing Si-B-Y coating on surface of tantalum and tantalum alloy

A technology of tantalum alloy and coating, which is applied in the field of penetrating agent for Si-B-Y coating on the surface of tantalum and tantalum alloy, which can solve the problems of ineffective protection of substrate, short life of high-temperature oxidation resistance, poor fluidity of oxide film, etc., and achieve good Anti-high temperature oxidation ability, improve high temperature anti-oxidation life, low cost effect

Inactive Publication Date: 2017-10-20
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the research level and current situation at home and abroad, the main problems of the silicide coatings currently researched and developed on tantalum alloys are: (1) brittleness itself, which will lead to a large number of cracks; (2) SiO 2 The oxide film has poor fluidity, cannot effectively protect the substrate, and is easy to peel off and lose its protection
The invention patent of Chinese patent application 201110024938.3 "High-temperature anti-oxidation material and method for preparing high-temperature anti-oxidation coating" discloses that the composition of the high-temperature anti-oxidation material is: Ta is 1.5-4.8Wt%, W is 5.2-8.7Wt %, Cr is 11.2-15.4Wt%, Ni is 2.3-5.7Wt%, B is 1.3-1.6Wt%, NaF is 0.4-0.8Wt%, Y is 1.1-2.3Wt%, and the balance is Si; it is also disclosed In order to prepare the coating by slurry melting method; the formula contains 8 ingredients, which is relatively complex
The coatings prepared by the above two invention patent applications will have many holes, the bonding force with the substrate is not good, and the high temperature oxidation resistance life is relatively short
At present, there are still blank reports on the formulation of B and Y modified silicide coatings on the surface of tantalum alloys and the preparation of coatings by embedding infiltration technology.

Method used

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  • Aluminizing agent and method for preparing Si-B-Y coating on surface of tantalum and tantalum alloy
  • Aluminizing agent and method for preparing Si-B-Y coating on surface of tantalum and tantalum alloy
  • Aluminizing agent and method for preparing Si-B-Y coating on surface of tantalum and tantalum alloy

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Embodiment 1

[0043] The infiltration agent for preparing Si-BY coating on the surface of tantalum and tantalum alloys of this embodiment is characterized in that its composition in terms of weight percentage is: 12% element Si (purity ≥99%), 1.0% infiltration Element Y 2 O 3 (Purity ≥99%), 1.0% of the permeated element B (purity ≥98%), 5% catalyst NaF (analytical purity), the balance is filler Al 2 O 3 .

[0044] The method for preparing Si-B-Y coating on the surface of tantalum and tantalum alloy of this embodiment includes the following steps:

[0045] ① After sanding the sample tantalum with 200#, 300# and 400# sandpaper, put it into analytically pure absolute ethanol for ultrasonic cleaning for 5 minutes, and then dry it for use;

[0046] ② Preparation of penetrating agent: according to weight percentage, weigh 12% of the infiltrated element Si and 1.0% of the infiltrated element Y for 100 mesh 2 O 3 , 1.0% infiltrated element B, 5% catalyst NaF, the balance is filler Al 2 O 3 Put the prepare...

Embodiment 2

[0058] The infiltration agent for preparing Si-BY coating on the surface of tantalum and tantalum alloys of this embodiment is characterized in that its composition in terms of weight percentage is: 15% infiltration element Si (purity ≥99%), 1.5% infiltration Element Y 2 O 3 (Purity ≥99%), 1.5% infiltrated element B (purity ≥98%), 6% catalyst NaF (analytical purity), the balance is filler Al 2 O 3 .

[0059] The method for preparing Si-B-Y coating on the surface of tantalum and tantalum alloy of this embodiment includes the following steps:

[0060] ① After sanding the sample tantalum with 200#, 300# and 400# sandpaper, put it into analytical pure absolute ethanol for ultrasonic cleaning for 5 minutes, and then blow it dry for later use;

[0061] ② Preparation of penetrating agent: according to weight percentage, weigh out 100 meshes of 15% infiltration element Si and 1.5% infiltration element Y 2 O 3 , 1.5% infiltrated element B, 6% catalyst NaF, the balance is filler Al 2 O 3 Place...

Embodiment 3

[0072] The infiltration agent for preparing Si-BY coating on the surface of tantalum and tantalum alloys of this embodiment is characterized in that its composition in terms of weight percentage is: 17% infiltration element Si (purity ≥99%), 2.0% infiltration Element Y 2 O 3 (Purity ≥99%), 2.0% infiltrated element B (purity ≥98%), 8% catalyst NaF (analytical purity), the balance is filler Al 2 O 3 .

[0073] The method for preparing Si-B-Y coating on the surface of tantalum and tantalum alloy of this embodiment includes the following steps:

[0074] ① After sanding the sample tantalum with 200#, 300# and 400# sandpaper, put it into analytical pure absolute ethanol for ultrasonic cleaning for 5 minutes, and then blow it dry for later use;

[0075] ② Preparation of penetrating agent: according to weight percentage, weigh out 100 mesh 17% of the element Si and 2.0% of the element Y 2 O 3 , 2.0% infiltrated element B, 8% catalyst NaF, the balance is filler Al 2 O 3 Put the prepared penet...

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Abstract

The invention belongs to the technical field of high-temperature coatings and particularly relates to an aluminizing agent and method for preparing a Si-B-Y coating on the surface of tantalum and tantalum alloy. The aluminizing agent disclosed by the invention comprises, by weight, 12%-17% of aluminized element Si (with the purity greater than or equal to 99%), 1.0%-2.0% of aluminized element Y2O3 (with the purity greater than or equal to 99%), 1.0%-2.0% of aluminized element B (with the purity greater than or equal to 98%), 5%-8% of catalyst NaF (analytically pure), and the balance fillers Al2O3. The invention further discloses the preparation method of the coating. The preparation method comprises the steps of (1) conducting surface pretreating on a sample; (2) conducting ball milling and refining on the prepared aluminizing agent; (3) putting the sample and the aluminizing agent into an aluminizing tank and sealing the aluminizing tank; (4) conducting heating, heat preservation and cooling on the aluminizing tank put in a high-temperature furnace; and (5) finally, taking out the sample and then cleaning and drying the sample. The obtained coating is uniform and compact in structure, can be well bonded to a matrix and can remarkably improve the thermal protection properties of matrix alloy and resist the high temperature of 1000 DEG C for 100 h or more, and the thermal protection properties mainly include the high-temperature antioxidation property, the anti-corrosion property and the anti-wear property. Equipment required by the method is simple, and the method is reliable in process, low in cost and suitable for production and application.

Description

Technical field [0001] The invention belongs to the technical field of high-temperature coatings, and specifically relates to a penetrating agent and method for preparing Si-B-Y coatings on the surface of tantalum and tantalum alloys. Background technique [0002] Tantalum is a refractory metal of the VB group with a melting point of up to 3033°C and good high-temperature strength. It is the most promising candidate for high-temperature structural materials. Therefore, more than 20 years of research work has been carried out on tantalum alloy preparation technology, composition design, structure control and oxidation resistance at home and abroad. However, the oxidation resistance of tantalum alloys at high temperatures is poor. Pure tantalum has "pest" oxidation even at 600°C, which has become one of the main bottlenecks restricting its application. [0003] At present, the research on improving the high temperature oxidation resistance of tantalum-based alloys mainly focuses on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/02
CPCC23C12/02
Inventor 李涌泉耿桂宏侯俊峰李宁董福元
Owner BEIFANG UNIV OF NATITIES
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