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激光重熔納米Al2O3-13%TiO2陶瓷涂層組織及性能
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國家自然科學(xué)基金資助項目(59975046)；江蘇省自然科學(xué)基金重點招標(biāo)項目(BK2004005)


Microstructure and Properties of Laser-Remelted Nanostructured Al2O3-13%TiO2 Ceramic Coatings
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    摘要:

    為了進(jìn)一步提高等離子噴涂納米Al2O3-13%TiO2(質(zhì)量分?jǐn)?shù), 下同)復(fù)合陶瓷涂層的性能，在γ-TiAl基體材料表面采用激光重熔工藝對涂層進(jìn)行處理，研究了激光重熔對涂層微觀組織和性能的影響。用掃描電鏡(SEM)和顯微硬度計分析了涂層形貌、微觀結(jié)構(gòu)和顯微硬度，同時對涂層的磨損特性進(jìn)行了考察。結(jié)果表明，等離子噴涂納米陶瓷涂層由納米顆粒完全熔化區(qū)和部分熔化區(qū)兩部分組成，仍然具有等離子噴涂態(tài)的典型層狀結(jié)構(gòu)。經(jīng)過激光重熔后，形成了致密細(xì)小的等軸晶重熔區(qū)、燒結(jié)區(qū)和殘余等離子噴涂區(qū)，由于激光快速加熱和快速冷卻加工特點，在重熔區(qū)仍保留了部分來源于原等離子噴涂部分熔化區(qū)的殘留納米粒子。與常規(guī)等離子噴涂陶瓷涂層相比，納米結(jié)構(gòu)涂層可在一定程度上提高其硬度和耐磨性，經(jīng)過激光重熔后其硬度和耐磨性進(jìn)一步提高

    Abstract:

    In order to improve the properties of the nanostructured Al2O3-13wt%TiO2 composite ceramic coatings fabricated by plasma spraying, a laser remelting experiment was carried out and the effects of laser remelting on the microstructure and properties of coatings were studied. The morphology, microstructure and microhardness of the coatings were investigated by SEM and microhardness. Meanwhile, the wear behavior of the coatings was researched. The results show that the plasma-sprayed nanostructured ceramic coating consists of not only fully melted regions but also partially melted regions, and the total coating has a lamellar-like structure as conventional coating. According to the microstructural difference, the ceramic coating can be divided into the remelted zone (fine equiaxed grains), the sintered zone and remained plasma-sprayed zone after laser remelting. The surface ceramic coating has smaller grains and higher compactness, and the lamellar structure of plasma-sprayed coating is eliminated. Due to the rapid heating and cooling of laser remelting, there are still some nanoparticles coming from the remained nanoparticles of plasma spraying in the remelted zone. The nanostructured ceramic coating has higher hardness, better wear resistance than the conventional ceramic coatings, and the laser–remelted coating has the highest hardness and the best wear resistance

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王東生,田宗軍,沈理達(dá),劉志東,黃因慧.激光重熔納米Al2O3-13%TiO2陶瓷涂層組織及性能[J].稀有金屬材料與工程,2009,38(9):1542~1546.[Wang Dongsheng, Tian Zongjun, Shen Lida, Liu Zhidong, Huang Yinhui. Microstructure and Properties of Laser-Remelted Nanostructured Al2O3-13%TiO2 Ceramic Coatings[J]. Rare Metal Materials and Engineering,2009,38(9):1542~1546.]
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  • 收稿日期:2008-09-01
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