Synthesis of RF Plasma-sprayed Coatings Based on the Controls of Droplet Flattening, Solidification and Reaction Step

基于熔滴压平、凝固和反应步骤控制的射频等离子喷涂涂层的合成

• 批准号: 09450280
• 负责人: TSUNEKAWA Yoshiki
• 金额: $ 8.7万
• 依托单位: Toyota Technological Institute
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450280/
• 关键词: Plasma Spraying; In Situ Composite; Nitrogen-mixed Plasma; Methane-mixed Plasma; Splat morphology; Nitride; Carbide; Structure Control; 高周波プラズマ溶射; スプラット; 構造制御; 粒子直径; Ti_2AlN; 金属間化合物; 超音波振動; 反応性溶射; 窒素プラズマ; 扁平化; 凝固; 窒化反応; 生成複合化

This research has been performed to understand the fundamental phenomenon in the synthesis of metal and intermetallic matrix composite coatings by reactive RF plasma spraying with premixed elemental powder, which is based on the droplet flattening, solidification and reaction with gases.Typical splat morphology of impinged titanium droplets on a substrate is a disk-type with an outer peripheral fringe. If the supplied titanium powder size becomes finer or the nitrogen partial pressure, splats containing prominent asperities (TiN) with a smaller flattening ratio appear along with the plain disk-type. Aluminum splats are also classified into two categories : a disk-type with an irregular outer periphery and a semi-nodular-type. Oxygen exists on the splat surfaces, on which there are nitrogen concentrated areas corresponding to AIN. Consequently, the nitride formation proceeds on titanium and aluminum droplets during the flight as well as on the substrate. If the substrate temperature in … More higher than 873 K just before spraying with premixed titanium and aluminum powder, the formation of TiAl and TiィイD22ィエD2SIN proceeds on the substrate.In situ composite coatings containing titanium carbide (TiC) precipitates were synthesized by reactive RF plasma spraying with elemental titanium powder, in which the effect of methane concentration premixed into the plasma gas on the TiC formation was examined through the process. The absorption of decomposed carbon into molten titanium droplets occurs during their flight in the plasma flame, so that fine TiC precipitates which increase in volume with mixed methane are recognized in the sprayed titanium particles. The flattering ratio of splats impinged on a substrate decreases with increasing premixed methane. The amount of TiC precipitates in titanium matrix coatings is approximately five times higher than that in sprayed particles during their flight regardless of premixed methane. Hence, the TiC formation is dominated at the splat depositing step, because the time exposed by the methane mixed plasma flame is much longer than the flight time of droplets. The maximum volume fraction of TiC precipitates is approximately 30 vol% in the coatings. Less

本文研究了反应射频等离子喷涂金属和金属间化合物基复合材料涂层的基本现象，即熔滴的扁平化、凝固和与气体的反应，钛熔滴在基体上的典型溅射形貌是具有外围边缘的圆盘状。如果所提供的钛粉末尺寸变得更细或氮分压变得更小，则包含具有更小平坦率的显著粗糙（TiN）的飞溅物与平坦盘型一起出现沿着。铝板也分为两类：具有不规则外周的盘状和半结节状。氧存在于溅射表面上，溅射表面上存在与AlN相对应的氮集中区。因此，氮化物的形成在飞行期间在钛和铝液滴上以及在基底上进行。如果衬底温度在 ...更多信息 采用射频反应等离子喷涂技术制备了含TiC（TiC）析出相的原位复合涂层，研究了等离子气体中甲烷浓度对TiC析出相形成的影响。在等离子体火焰中的飞行过程中，发生将分解的碳吸收到熔融钛液滴中，从而在喷射的钛颗粒中识别出随着混合甲烷体积增加的细TiC沉淀物。随着预混甲烷浓度的增加，撞击在基底上的飞溅的扁平率减小。无论预混甲烷如何，钛基涂层中TiC沉淀物的量比喷涂颗粒在飞行过程中的量高约5倍。因此，TiC的形成在溅射沉积步骤中占主导地位，因为甲烷混合等离子体火焰暴露的时间比液滴的飞行时间长得多。涂层中TiC析出相的最大体积分数约为30体积%。少

项目成果

Y.Tsunekawa, M.Hiromura, M.Okumiya: "Nutriding of Metal Droplets in Synthesis of Intermetallic Matrix Composite Coatings by Reactive RF Plasma Spraying"Proceedings of 15th International Thermal Spray Conference, C.Coddet ed., ASM International. 1143-1148

Y.Tsunekawa、M.Hiromura、M.Okumiya：“通过反应性射频等离子喷涂合成金属间基质复合涂层中的金属液滴的氮化”第 15 届国际热喷涂会议论文集，C.Coddet 编辑，ASM International。

Y.Tsunekawa et al: "Nitride Formation in Synthesis of Titanium Aluminide Matrix Composite Coatings by Reactive RF Plasma Spaying"J. Thermal Spray Tech.. 9(in press). (2000)

Y.Tsunekawa 等：“通过反应射频等离子体喷涂合成铝化钛基复合涂层中氮化物的形成”J。

Y.Tsunekawa et al: "Reaction of Metal Droplets during Flight and on Substrate in Reactive Low Pressure DC Plasma Spraying" Proc.SMT11, ASM International. 234-245 (1998)

Y.Tsunekawa 等人：“反应性低压直流等离子喷涂中飞行过程中金属液滴和在基材上的反应”Proc.SMT11，ASM International。

Y.Tsunekawa et al: "Nitriding of Metal Droplets in Synthesis of Intermetallic Matrix Composite Coatings by Reactive RF Plasma Spraying"Proc. 15th ITSC, ASM International. 1143-1148 (1998)

Y.Tsunekawa 等人：“通过反应射频等离子喷涂合成金属间基质复合涂层中的金属液滴氮化”Proc。

K.Tanaka, Y.Tsunekawa, M.Okumiya: "Synthesis of Titanium Silicide Matrix Composites"Proc. 9th CIMEC-World Forum on New Materials Symposium. 397-406 (1999)

K.Tanaka，Y.Tsunekawa，M.Okumiya：“硅化钛基复合材料的合成”Proc。