US 7,537,809 B2
Rotating member and method for coating the same
Hiroyuki Ochiai, Chiyoda-ku (Japan); Mitsutoshi Watanabe, Chiyoda-ku (Japan); Mikiya Arai, Chiyoda-ku (Japan); Shigeru Saburi, Chiyoda-ku (Japan); Tsuyoshi Yamakawa, Chiyoda-ku (Japan); Shogo Tsugumi, Chiyoda-ku (Japan); Jun Sakai, Chiyoda-ku (Japan); Tsunao Tezuka, Chiyoda-ku (Japan); Akihiro Goto, Chiyoda-ku (Japan); and Masao Akiyoshi, Chiyoda-ku (Japan)
Assigned to IHI Corporation, Tokyo (Japan); and Mitsubishi Denki Kabushiki Kaisha, Tokyo (Japan)
Filed on Oct. 29, 2004, as Appl. No. 10/976,215.
Application 10/976215 is a continuation in part of application No. PCT/JP03/12945, filed on Oct. 09, 2003.
Claims priority of application No. 2002-295964 (JP), filed on Oct. 09, 2002; application No. 2002-295966 (JP), filed on Oct. 09, 2002; and application No. 2003-167075 (JP), filed on Jun. 11, 2003.
Prior Publication US 2005/0063827 A1, Mar. 24, 2005
Int. Cl. B05D 3/06 (2006.01)
U.S. Cl. 427—580  [219/69.15; 219/76.13] 18 Claims
OG exemplary drawing
 
1. A method for coating a rotatable member of a turbine or a compressor with an abrasive coating film in order to minimize clearance between the rotatable member and an opposite component of the turbine or the compressor, the method comprising the steps of:
(a) generating a pulsed discharge between a rotatable member formed into a predetermined shape and a first discharge electrode in a dielectric liquid or gas, wherein the first discharge electrode is a green compact electrode;
(b) transferring a first coating material from the first discharge electrode onto the rotatable member by each discharge pulse so that the abrasive coating film is formed on the rotating member, wherein when the abrasive coating film formed by the first coating material rubs against the opposite component the abrasive coating film shaves the opposite component, wherein the green compact electrode includes the first coating material or a second material that changes into the first coating material due to the discharge, and the first coating material is one of, or a mixture of, cBN, TiC, TiN, TiAlN, TiB2, WC, Cr3C2, SiC, ZrC, VC, B4C, Si3N4, ZrO2—Y, and Al2O3, and the second coating material is one of Ti, W, Cr, Zr, Si, V, Mo and Nb;
(c) forming, on the rotatable member, the abrasive coating film by repeatedly generating the discharge pulse, wherein the rotatable member is a turbine blade, a compressor blade or a labyrinth seal; and
(d) deploying the rotatable member in the turbine or the compressor, wherein the rotatable member is disposed so that there is a clearance between the rotatable member and the opposite component of the turbine or the compressor so that the abrasive coating film shaves the opposite component when the abrasive film rubs against the opposite component thereby minimizing the clearance between the rotatable member and the opposite component.