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TiAl合金激光表面原位TiC顆粒增強(qiáng)涂層及高溫抗氧化性能
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TG146.4

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國(guó)家自然科學(xué)基金資助(50371072) 湖南省教育廳青年基金資助(01B002)


Microstructure Characteristics and Oxidation Resistance Properties of "in-situ" TiC Particle Reinforced Coatings by Laser Surface Alloying
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    摘要:

    以高純石墨粉和C Nb混合粉末為原料，對(duì)Ti-46Al-2Cr-1．5Nb-1V合金進(jìn)行了激光表面合金化處理，對(duì)激光改性層的顯微組織以及成分進(jìn)行了觀察與分析，并對(duì)該合金原始組織及經(jīng)C和C Nb激光表面改性層的高溫抗氧化性能進(jìn)行了對(duì)比分析研究。結(jié)果表明，C和C Nb激光表面合金化處理后，在合金表面均“原位”形成了TiC顆粒，Nb以固溶原子形式存在于表面改性層中，TiC顆粒的大小，形態(tài)及分布強(qiáng)烈取決于激光工藝參數(shù)；激光表面處理后的合金的抗氧化性能明顯高于未經(jīng)激光處理的鑄態(tài)組織，而且在石墨粉中摻雜Nb粉，處理后的合金具有最佳的抗氧化性能。

    Abstract:

    Laser surface alloying with C and C+Nb was used to modify the surface properties of Ti-46Al-2Cr-1.5Nb-lV alloy. The microstructure of the laser alloyed surface layer was studied as function of laser processing parameters. The oxidation resistance properties of the original alloy and the samples with the laser surface treatment with C and C+ Nb at high temperature were investigated. The results indicate that, by laser alloying with with C and C+Nb, the particles of TiC were "in-situ" produced in the laser surface layer. Nb exists in the TiAl matrix as the solute atom. The size, shape and distribution of TiC are strongly dependent on the laser processing parameters. By laser surface alloying with C and C+Nb powders, the oxidation resistance is improved obviously, and the sample alloying with C+Nb exhibits the best oxidation resistance.

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辛艷輝 林建國(guó) 任志昂. TiAl合金激光表面原位TiC顆粒增強(qiáng)涂層及高溫抗氧化性能[J].稀有金屬材料與工程,2005,34(6):899~902.[Xin Yanhui, Lin Jianguo, Ren Zhiang. Microstructure Characteristics and Oxidation Resistance Properties of "in-situ" TiC Particle Reinforced Coatings by Laser Surface Alloying[J]. Rare Metal Materials and Engineering,2005,34(6):899~902.]
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  • 最后修改日期:2003-05-31
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