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    • 6. 发明授权
    • Method of making tantalum metal powder with controlled size distribution
and products made therefrom
    • 制造具有受控尺寸分布的钽金属粉末和由其制成的产品的方法
    • US5954856A
    • 1999-09-21
    • US638922
    • 1996-04-25
    • Viren M. PathareBhamidipaty K. D. P. RaoJames Allen FifeHongju ChangRoger W. SteeleLee M. Ruch
    • Viren M. PathareBhamidipaty K. D. P. RaoJames Allen FifeHongju ChangRoger W. SteeleLee M. Ruch
    • H01G9/052B22F1/00B22F9/04B22F9/20C22B34/24C22C1/04
    • H01G9/0525B22F1/0011C22C1/045
    • A process for sizing (i.e., comminuting) a tantalum powder including agglomerates of smaller particles, which process yields a tantalum powder having an as-comminuted agglomerate size distribution with the product of the Volume Mean Diameter, MV (in microns as measured by light scattering techniques such as Microtrac analysis), times specific surface area, BET (m.sup.2 /g), being less than about 25. These powders after sizing typically have ratios of Scott Bulk Density : BET Surface Area in the range from about 20 to about 35. Also provided are powders having a substantially unimodal and narrow agglomerate size distribution in all stages of production, namely after sizing (i.e., deagglomeration by comminution), thermal agglomeration (i.e., heat treatment), and deoxidation. These resultant powders have high surface area and good flowability properties and, upon sintering, exhibit controlled shrinkage with high porosity. Further provided are sized heat treated tantalum powders having agglomerate particle sizes wherein the product of the Volume Mean Diameter, MV, times the specific surface area, BET, is in the range from about 90 to about 250. Sized and agglomerated powders which are deoxidized are also provided wherein the product of the Volume Mean Diameter, MV, times the specific surface area, BET, is in the range from about 90 to about 250.
    • 一种用于定型(即粉碎)包括较小颗粒的附聚物的钽粉末的方法,该方法产生具有粉碎的团聚体尺寸分布的钽粉末,其体积平均直径,MV(以微米为单位,通过光散射测量) 技术如Microtrac分析),次比表面积,BET(m2 / g),小于约25.上浆后的这些粉末通常具有约20至约35的Scott堆积密度:BET表面积的比率。 还提供了在生产的所有阶段,即在施胶(即通过粉碎解聚),热附聚(即热处理)和脱氧之后具有基本上单峰和窄团聚体尺寸分布的粉末。 这些所得到的粉末具有高的表面积和良好的流动性能,并且在烧结时表现出具有高孔隙率的受控收缩。 进一步提供了具有附聚粒度的大小的热处理钽粉末,其中体积平均直径,MV,乘以比表面积BET的产物在约90至约250的范围内。脱氧的定型和附聚粉末是 还提供了其中体积平均直径,MV,乘以比表面积BET的乘积在约90至约250的范围内。