Title:
NbSi2系ナノ複合被覆層及びその製造方法
Document Type and Number:
Japanese Patent JP4081081
Kind Code:
B2
Abstract:
A NbSi2-base nanocomposite coating formed on the surface of niobium or niobium-base alloys is disclosed. The nanocomposite coating layer is manufactured by forming a niobium carbide layers or a niobium nitride layers by depositing of carbon or nitrogen on the surface, and then depositing silicon. The nanocomposite coating layer has a microstructure that SiC or Si3N4 particles are mostly precipitated on an equiaxed NbSi2 grain boundary. The thermal expansion coefficients of NbSi2-base nanocomposite coating layers become close to that of the substrates by adjusting the volume fraction of SiC or Si3N4 particles in the nanocomposite coating layers. Accordingly, the generation of cracks caused by thermal stress due to the mismatch in thermal expansion coefficient between the NbSi2-base nanocomposite coatings and the substrates can be suppressed, thereby improving the high-temperature oxidation resistance in the repeated thermal cycling use of the NbSi2-base nanocomposite coated substrates. Further, the increase in the volume fraction of dense SiO2 oxide phase formed on the surface of the NbSi2-base nanocomposite coating layers improves also high-temperature isothermal oxidation resistance.
Inventors:
Youn
Kim Ho Ho
Hong Kei
Toshoman
Lee Zhong
Lee Kei
Son Toru
Kim Ho Ho
Hong Kei
Toshoman
Lee Zhong
Lee Kei
Son Toru
Application Number:
JP2004381809A
Publication Date:
April 23, 2008
Filing Date:
December 28, 2004
Export Citation:
Assignee:
Korea Institute of Science and Technology
International Classes:
C23C12/00; C01B33/06; C23C10/44; C23C16/24; C23C16/26
Domestic Patent References:
| JP2003268529A | ||||
| JP1177356A | ||||
| JP1177357A | ||||
| JP57170814A | ||||
| JP9176826A | ||||
| JP60017064A | ||||
| JP4333577A |
Attorney, Agent or Firm:
Tomijio Sasashima
Haruyuki Nishiyama
Haruyuki Nishiyama