Exhibition category
Contact address
| Address | 1－515－3, Zenibako, Otaru-City, Hokkaido 047-0261 Japan |
|---|---|
| Telephone | +81134611670 |
| URL | http://dbcsystem.co.jp/ |
| dbc@dbcsystem.co.jp |
Main exhibits 1
Multi-functional DBC Systems for High Temperature Applications
Diffusion barrier coating (DBC) systems on heat resistant alloys consist of a multilayer structure: an outer Al-reservoir layer and an inner diffusion barrier layer(DBL). The outer Al-reservoir layer forms a protective Al2O3 scale and DBL acts as a barrier layer against alloy interdiffusion. Three kinds of DBL were developed:Re on Ni-based superalloys; W on stainless steels; and Cr on Ni?Cr alloys. It was found that DBC systems have excellent mechanical properties (creep and fatigue),improving alloy substrate performance, and enhance the anti-exfoliation properties of YSZ in thermal barrier coatings (TBC) in addition to providing excellent oxidation resistance. At temperatures higher than 1300 °C, however, the DBC design based on kinetics (diffusion) is insufficient to form and maintain a protective Al2O3 scale. In this case a self-maintaining coating (SMC) system designed on the basis of thermodynamics (phase stability) is required. The SMC system formed on Nb?Hf(C-103) alloy consists of a multi-layer structure: an outer Re (Al, Si)1.8 and inner NbSi2 layers, plus a transient Nb5Si3 layers formed during oxidation. At temperatures higher than 1300 °C the Al2O3 can be formed by changing the Al/Si ratio in the Re (Al, Si)1.8 in which Si was supplied from the decomposition reaction of NbSi2 to Si + Nb5Si3 during selective oxidation of Al. It is proposed that coating alloys should be designed for considering not only high temperature oxidation, but also alloy substrate mechanical properties and anti-exfoliation of oxide scales, based on both kinetic principles (DBC system) and thermodynamics (SMC system).
Multi-functional DBC Systems （PDF file - 334KB）
Main exhibits 2
DBC coatings fo Gas Turbines and Jet Engines
Our product (DBC coating system) can be applied to jet engine hot sections components (combustors, turbines, turbine blades and rotors).
The DBC coating system improves both anti-oxidation and mechanical properties of Alloys (Ni-based Alloys, Ni-based SX superalloys and tainless steel).
DBC coatings fo Gas Turbines and Jet Engines （PDF file - 469KB）
Main exhibits 3
Development of Re(Al,Si)1.8 Coating on Nb-Hf Alloy of Thruster Engines
Our product (DBC coating system) can be applied to rocket engine components (combustors, nozzles and burners) and satellite thruster engines(Nb-based alloys).