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A method for preparing niobium silicide coating on the surface of niobium or niobium alloy

A technology of niobium silicide and niobium alloy, which is applied in the coating process of metal materials, coating, molten spraying, etc., and can solve the problems of uneven coating thickness and structure, affecting the oxidation resistance of coatings, and poor thermal conductivity of powder mixtures. , to achieve the effects of controllable coating thickness, controllable coating composition and thickness, and strong chemical-metallurgical bonding

Active Publication Date: 2019-11-15
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, the molten salt system is complex, and the coating structure is greatly affected by the composition of the molten salt, and the thickness of the formed coating is uneven, which affects the oxidation resistance of the coating to a certain extent.
Wang et al. used the embedding method to wrap the niobium alloy in 16Si-8Ge-5NaF-71Al 2 o 3 (wt.%) Ge-modified NbSi was prepared in the mixed powder 2 Coating【2.W.Wang, Formation and oxidation resistance of germaniummodified silicide coating on Nb based in situ composites, Corrosion Science 80(2014)164–168】, but the thermal conductivity of the powder mixture in the embedding method is poor, and this method Influenced by gravity, which can lead to uneven coating thickness and structure

Method used

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  • A method for preparing niobium silicide coating on the surface of niobium or niobium alloy
  • A method for preparing niobium silicide coating on the surface of niobium or niobium alloy
  • A method for preparing niobium silicide coating on the surface of niobium or niobium alloy

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preparation example Construction

[0023] Preparation of silicon coating. Specifically, silicon powder with a certain particle size distribution is selected, and the silicon powder is sprayed onto the surface of sandblasted niobium or niobium alloy by plasma spraying technology to form a silicon coating. The selected powder for spraying is silicon powder with a particle size of 10-120 μm, and the purity of the powder is greater than 98wt.%. Dry at 100-120°C for 1-3 hours and set aside. The process parameters of the plasma spraying technology may include: plasma gas Ar: 30-50 slpm; plasma gas H 2 : 6~15slpm; powder carrier gas Ar: 2~7slpm; spraying distance: 100~200mm; spraying power: 30~50kW; powder feeding rate: 10~30rpm. In the invention, by controlling the process parameters of the plasma spraying technology, the silicon powder is sprayed on the surface of the niobium or niobium alloy substrate to form a silicon coating with a thickness of 30-300 μm.

[0024] The substrate sprayed with the silicon coating...

Embodiment 1

[0032] A niobium silicide coating on a niobium metal surface, the preparation of which comprises the steps of:

[0033] 1) Sandblasting the surface of the Nb substrate with a sandblasting pressure of 0.4 MPa, ultrasonicating twice in absolute ethanol solution for 5 minutes each time, drying at 100°C for 2 hours, and set aside;

[0034] 2) Use silicon powder with a median particle size of about 30 μm and a purity greater than 98wt.% as the raw material for spraying, dry at 100°C for 3 hours, and set aside;

[0035] 3) Using a plasma spraying system (A-2000, Sulzer Metco AG, Switzerland), using the process parameters in Table 2, spraying silicon powder onto the surface of the Nb substrate to form a silicon coating, the thickness of the silicon coating is about 110 μm, figure 1 The XRD results show that the silicon coating is a cubic phase;

[0036] Table 2 is the plasma spraying Si coating process parameters:

[0037]

[0038] 4) Vacuum-atmosphere sintering furnace (ZT-50-2...

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Abstract

The invention relates to a method for preparing a niobium silicide coating on a surface of niobium or niobium alloy. The method comprises the steps of adopting silicon powder as a raw material, adopting a plasma spraying technology for preparing a silicon coating on a surface of a niobium or niobium alloy matrix, then carrying out heat treatment in an inert atmosphere at 1000 to 1500 DEG C for 1 to 10 hours, and forming the niobium silicide coating on the surface of the matrix. The preparation method provided by the invention has the advantages of simple process, low cost, high efficiency, good repeatability, suitability for large-scale production, and the like, and has wide application prospects.

Description

technical field [0001] The invention relates to a method for preparing a silicide coating, in particular to a method for preparing a niobium silicide coating with a gradient structure on the surface of niobium or a niobium alloy, and belongs to the technical field of high-temperature coatings. Background technique [0002] Niobium (Nb) is a refractory metal with a high melting point (2468°C), moderate density, corrosion resistance, radiation resistance, high temperature strength and good high temperature mechanical properties. The excellent properties of niobium and niobium alloys make it one of the important candidate materials for high-temperature structural parts in the aviation, aerospace and nuclear industries, and can be used to manufacture key components such as rocket engines and nuclear reactors. However, its oxidation performance is poor. Pure niobium has a "pest" oxidation phenomenon at 600 °C, and as the temperature increases, the degree of oxidation intensifies,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/04C23C4/18
Inventor 牛亚然翟翠红黄利平李红郑学斌孙晋良丁传贤
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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