Mo and Mo-based alloys are important aerospace materials with excellent high temperature mechanical properties. However, their oxidation resistance is very poor at temperature, the formation of volatile MoO3 will lead to catastrophic failure molybdenum alloy components. Extensive research on problem has indicated that halide activated pack cementation (HAPC) technology an ideal method solve pro...

the application of conductive coatings on ferritic stainless steel can decrease electrical conductivity. theaim of this research was to investigate the electrical conductivity of cobalt coated aisi 430 ferritic stainlesssteel by pack cementation technique. coated coupons were analyzed using scanning electron microscopy(sem). electrical conductivity of the coated substrates was measured as a fun...

Nickel superalloys are the main materials used in manufacturing of turbine blades and vanes aero-space industry. They works is extremely high temperature a corrosive environment (oxidation, hot corrosion) undergo several different thermo-mechanical loads. Aluminide coatings method protection surface nickel against exhaust gasses jet en-gine. In presented article microstructural characterization...

long–term stability and oxidation resistance of aisi 439 ferritic stainless steel used as interconnects in solid oxide fuel cells can be improved by use of a protective coating. in this study the pack cementation method was employed to coat aisi 439 ferritic stainless steel with manganese. isothermal oxidation was conducted at 800 ºc for 200 hours in static air to investigate the role of coatin...

Formation mechanism of silicon modified aluminide coating applied on a nickel base super alloy IN-738 LC by pack cementation process was the subject of investigation in this research. Study of the microstructure and compositions of the coating was carried out, using optical and scanning electron microscopes, EDS and X-ray diffraction (XRD) techniques. The results showed that due to low partial ...

Ultra-high temperature ceramics are desirable for applications in the hypersonic vehicle, rockets, re-entry spacecraft and defence sectors, but few materials can currently satisfy the associated high temperature ablation requirements. Here we design and fabricate a carbide (Zr0.8Ti0.2C0.74B0.26) coating by reactive melt infiltration and pack cementation onto a C/C composite. It displays superio...

The novel low-cost biologically derived substrates made of biogenic materials such as high-density fiberboards, felt and paper based compositions are investigated by using microscopy techniques. Plates from these materials were carbonized or graphitized, pressed and diced. In order to seal the surface of the substrates they were processed through different post treatments such as siliconization...