球形TC4粉末的氣霧化制備、表征及間隙元素控制
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-06-03
利用水冷銅坩堝熔煉、高純氬氣霧化技術制備出高品質球形TC4合金粉末。將石墨導流管的內壁用Y2O3與無水乙醇配比的涂料進行涂覆，分析其對霧化粉末間隙元素的影響，總結氣霧化粉末的間隙元素來源及控制建議，并對不同粒度粉末的顯微組織進行表征。
球形TC4粉末的氣霧化制備、表征及間隙元素控制Characterization of spherical TC4 powders by gas atomization and its interstitial elemental control利用水冷銅坩堝熔煉、高純氬氣霧化技術制備出高品質球形TC4合金粉末。將石墨導流管的內壁用Y2O3與無水乙醇配比的涂料進行涂覆，分析其對霧化粉末間隙元素的影響，總結氣霧化粉末的間隙元素來源及控制建議，并對不同粒度粉末的顯微組織進行表征。結果表明:石墨導流管內壁在無涂層的情況下，霧化粉末的碳含量較大;而導流管內壁的Y2O3涂層能有效降低碳對鈦合金污染的風險;粉末間隙元素含量隨著粒徑的減小而增大;粒徑較大粉末的表面為胞狀晶組織，而小尺寸粉末表面光滑且無明顯結晶組織;由于快速凝固的原因，粒徑較大粉末的內部主要由α相胞晶和針狀馬氏體α′相組成，小粒徑粉末的內部組織明顯細化，全部為蜂窩狀的胞狀晶 組織。
The spherical TC4 alloy powders were produced by gas atomization using water-cooled copper crucible and argon gas with high purity. The Y2O3?layer was coated onto the inner wall of the graphite nozzle. The interstitial level of the gas-atomized powders with various particle sizes was analyzed to investigate the effect of coating. The sources of interstitial content for gas-atomized powders were also discussed and related suggestions for its control were provided. Besides, the microstructures of gas-atomized powders with various particle sizes were also characterized in terms of surface morphology and cross-sectional structures. The results show that the Y2O3?coating can effectively prevent the gas-atomized powders from carbonization by graphite nozzle as comparing with or without coating. The interstitial component of the gas-atomized TC4 powders increases with the particle size decreasing. The surface of coarse powders exhibits the cellular structure with equiaxed grains. However, the fine powders achieve smooth surfaces and can not be observed any crystallization. Because of rapid solidification, both α cells and acicular martensite α′ phases are observed in the internal area of coarse powders, while only honeycomb cellular structure is demonstrated with refined grains in fine powders.
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