| 发明名称 |
Method for surface treatment |
| 摘要 |
A method for surface treatment in which a fluidizable powder mixture consisting of a powder of a refractory material, and a surface layer-forming powder of a metal, or alloy or both is fluidized by a fluidizing gas supplied through a gas distributor to form above the gas distributor a fluidized bed in which a surface layer is formed on the material to be treated under heating in the presence of a halide. A layer of coarse particles is disposed between the fluidized bed and the gas distributor, and the coarse particles have a mean diameter, D(m), as defined below: (1650V mu /PG)+E,fra 1/2+EE <D<6.5d where V: velocity of the fluidizing gas (m/s); mu : viscosity coefficient of the fluidizing gas (kg/mxs); P: mean density of the coarse particles (kg/m3); G: acceleration of gravity (9.8 m/s2); d: mean particle diameter of the surface layer-forming powder (m). The layer of coarse particles can prevent the agglomeration of fluidized bed powders and protect the gas distributor against exposure to the highly reactive powders and gases.
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| 申请公布号 |
US5620521(A) |
申请公布日期 |
1997.04.15 |
| 申请号 |
US19950386230 |
申请日期 |
1995.02.10 |
| 申请人 |
KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO |
发明人 |
TACHIKAWA, HIDEO;TAKEDA, HIROMASA;NAKANISHI, KAZUYUKI |
| 分类号 |
C23C10/34;B01J8/32;C23C16/442;F27B15/00;(IPC1-7):C23C16/00 |
主分类号 |
C23C10/34 |
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