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Novel tantalum-based Si-Mo-ZrB2 composite coating containing TaB diffusion barrier layer and three-step preparation method of novel tantalum-based Si-Mo-ZrB2 composite coating

A si-mo-zrb2, composite coating technology, applied in the field of high temperature anti-oxidation coating preparation, can solve the problems of mutual diffusion, the decline of anti-oxidation performance, etc., achieve low evaporation rate, good high-temperature anti-oxidation performance, prolonged high temperature use effect of life

Active Publication Date: 2022-03-01
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the interdiffusion of oxide forming elements and matrix elements in the current tantalum-based high-temperature anti-oxidation coating seriously leads to the decline of anti-oxidation performance, the purpose of the present invention is to use A method with simple process and low cost is to prepare a boride diffusion barrier layer between the tantalum substrate and the main body of the coating to solve the problem of interdiffusion between the main elements of the coating and the matrix elements during the high temperature oxidation process, and improve the performance of tantalum and its alloys. operating temperature

Method used

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  • Novel tantalum-based Si-Mo-ZrB2 composite coating containing TaB diffusion barrier layer and three-step preparation method of novel tantalum-based Si-Mo-ZrB2 composite coating
  • Novel tantalum-based Si-Mo-ZrB2 composite coating containing TaB diffusion barrier layer and three-step preparation method of novel tantalum-based Si-Mo-ZrB2 composite coating
  • Novel tantalum-based Si-Mo-ZrB2 composite coating containing TaB diffusion barrier layer and three-step preparation method of novel tantalum-based Si-Mo-ZrB2 composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] (1) Substrate pretreatment: select tantalum alloy as the substrate, the size is 2mm × 6mm × 80mm, sand the surface until there are no obvious sharp protrusions and wire cutting marks, and grind away the trace oxidized skin, wash with water after sandblasting , pickling, and alkali cleaning, clean them with alcohol ultrasonic waves, and put them in a drying oven for drying.

[0084] (2) Boronizing powder preparation: according to 95% Al 2 o 3 Powder, 4% NH 4 The mass fractions of F powder and 1% B powder are proportioned, the average particle sizes of the three are 3 μm, 1 μm and 1 μm respectively, and the purity of the three powders is not less than 99%. Put the prepared boronizing powder into the ball mill tank, the ball to material ratio is 2.5:1, the speed is 100r / min, and the ball milling time is 10h.

[0085] (3) Preparation of boride body: disperse and embed tantalum alloy with dry and clean surface in a corundum crucible filled with boronizing powder, compact ...

Embodiment 2

[0090] (1) Substrate pretreatment: select tantalum alloy as the substrate, the size is 2mm × 6mm × 80mm, sand the surface until there are no obvious sharp protrusions and wire cutting marks, and grind away the trace oxidized skin, wash with water after sandblasting , pickling, and alkali cleaning, clean them with alcohol ultrasonic waves, and put them in a drying oven for drying.

[0091] (2) Boronizing powder preparation: according to 94% Al 2 o 3 Powder, 4% NH 4 The mass fractions of Cl powder and 2% B powder are proportioned, and the average particle sizes of the three are 3 μm, 1 μm and 1 μm respectively, and the purity of the three powders is not less than 99%. Put the prepared boronizing powder into the ball mill tank, the ball to material ratio is 3:1, the speed is 100r / min, and the ball milling time is 10h.

[0092] (3) Preparation of boride body: disperse and embed tantalum alloy with dry and clean surface in a corundum crucible filled with boronizing powder, compa...

Embodiment 3

[0097] (1) Substrate pretreatment: select tantalum alloy as the substrate, the size is 2mm×7mm×70mm, sand the surface until there are no obvious sharp protrusions and wire cutting traces, and grind off trace oxidized skin, wash with water after sandblasting , pickling, and alkali cleaning, clean them with alcohol ultrasonic waves, and put them in a drying oven for drying.

[0098] (2) Boronizing powder preparation: according to 93% Al 2 o 3 Powder, 4% NH 4 The mass fractions of Cl powder and 3% B powder are proportioned, the average particle diameters of the three are 4 μm, 2 μm and 2 μm respectively, and the purity of the three powders is not less than 99%. Put the prepared boronizing powder into the ball mill tank, the ball to material ratio is 4:1, the rotation speed is 120r / min, and the ball milling time is 10h.

[0099] (3) Preparation of boride body: disperse and embed tantalum alloy with dry and clean surface in a corundum crucible filled with boronizing powder, comp...

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Abstract

The invention discloses a novel Si-Mo-ZrB2 composite coating containing a TaB diffusion barrier layer and a preparation method of the novel Si-Mo-ZrB2 composite coating. Belongs to the technical field of ultrahigh-temperature anti-oxidation coating preparation. The preparation method comprises the following steps: by taking tantalum and tantalum alloy as a matrix, firstly preparing a boride diffusion barrier layer on the surface of the matrix by adopting a boriding method, and then preparing an Si-Mo-ZrB2 composite coating on the surface of a prefabricated boride layer blank by adopting a slurry spraying and sintering method; and finally, the silicide host phase content of the coating is increased by adopting a halide embedding siliconizing method. The preparation process is reasonably regulated and controlled through a three-step method, the coating components are optimized, the TaB diffusion barrier layer is successfully prefabricated between the matrix and the coating body, the silicon element of the coating body phase is effectively prevented from being diffused and consumed towards the matrix, the ultra-high-temperature oxidation resistance of tantalum and tantalum alloy is effectively improved, the preparation process is simple, the production cost is low, and the preparation method is suitable for industrial production. And the obtained coating is compact and uniform, and can stably serve for a long time in a high-temperature aerobic environment of 1700 DEG C or above.

Description

technical field [0001] The present invention specifically relates to a novel tantalum-based Si-Mo-ZrB containing a TaB diffusion barrier layer 2 The design and preparation method of a composite coating belongs to the technical field of preparation of high-temperature oxidation-resistant coatings. Background technique [0002] Tantalum and tantalum alloys not only have excellent mechanical properties, corrosion resistance, welding performance and stable physical and chemical properties at room temperature, but also have good high-temperature strength, high-temperature creep resistance and thermal shock resistance at high temperatures. Devices, aerospace and other fields are favored. Compared with the most commonly used molybdenum, niobium, and tungsten alloys in the same field at present, tantalum alloys have better toughness and no brittle transition temperature, so they are also a good power conversion material for space large-scale nuclear power systems. The addition of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/00C23C24/08C23C28/00
CPCC23C12/00C23C24/08C23C28/324C23C28/34Y02T50/60
Inventor 蔡圳阳肖来荣刘赛男赵小军李杉周明哲沈鸿泰浦荣张亚芳徐嘉维
Owner CENT SOUTH UNIV
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