Title:
THIN-COAT CERAMIC FINISH AND METHOD FOR THE PRODUCTION THEREOF, FRICTION SURFACE BASED ON A THIN-COAT CERAMIC FINISH AND METHOD FOR THE PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2001/053570
Kind Code:
A1
Abstract:
The invention relates to oxide coatings and can be used in mechanical engineering, in addition to the chemical and petrochemical industries. A thin-coat ceramic finish consists of crystals of alpha-Al¿2?O¿3? having a filiform structure with alternating arched and spiral areas and which are disposed within a matrix of gamma-Al¿2?O¿3? and mullite 3 A¿2?O¿3?2SiO¿2?. The production of the thin-coat ceramic finish comprises the following: a powder mixture of 70 % SiO¿2? and 30 % Al¿2?O¿3? is added to an alkaline electrol yte which contains liquid glass. The treatment is performed in a cathode-anode regime Jc/ Ja= 1.0-1.5. A friction surface based on the thin-coat ceramic finish consists of crystals of alpha- Al?2¿O?3¿ which come out directly onto the surface of friction outside the matrix of gamma-Al¿2?O¿3? and mullite 3 A¿2?O¿3?2SiO¿2?. In order to obtain the friction surface, the coating is abraded. The hardness of an abrasive tool must be higher than resistance of a base of the friction surface and not lower than the resistance of filiform crystals of alpha- Al¿2?O¿3?. The abrasion is continued until a pseudoviscous layer is formed. The invention ensures increased micro-hardness and crack resistance which are the main criteria of the resistance of ceramic coatings.
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Inventors:
ZALYGIN JURY REMOVICH (RU)
Application Number:
PCT/RU2000/000235
Publication Date:
July 26, 2001
Filing Date:
June 16, 2000
Export Citation:
Assignee:
ZALYGIN JURY REMOVICH (RU)
International Classes:
C25D11/02; C25D15/00; F16C33/04; F16C33/12; (IPC1-7): C25D11/02; C25D15/00; F16C33/12
Domestic Patent References:
| WO1995018250A1 | 1995-07-06 |
Foreign References:
| RU2086713C1 | 1997-08-10 | |||
| RU2038428C1 | 1995-06-27 | |||
| EP0218159A1 | 1987-04-15 | |||
| SU926084A1 | 1982-05-07 |
Other References:
V.M. GROSHEVA ET AL.: "Sintetichesky mullit i materialy na ego osnove", TEKHNIKA, 1971, KIEV, pages 25 - 29
Attorney, Agent or Firm:
Shtylkov, Vitaly Viktorovich (Moscow, 2, RU)
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