During vapor-phase deposition at 1273 K (1000 C), by pack cementation, of Mo onto 127-lmdiameter Ni wires, two phenomena are observed to occur concurrently, leading to strong surface roughening: (i) the inward radial growth of Kirkendall pores below the wire surface and (ii) the outward growth from the wire surface of protuberances with sizes as large as 15 lm. Highaspect-ratio Kirkendall pores...

A ZrC–SiC inner layer was fabricated on carbon/carbon composites by pack cementation at different temperatures, aiming to prepare a transition for subsequent deposition of SiC and chemical vapor plasma spray. Results show that the structure phase composition significantly affected interface bonding strength thermal shock resistance multilayer, which played vital role in resisting ablation. The ...

In this work a pack cementation of germanium-doped aluminum and silicon coatings on low alloy steel type-T21 has been applied. This gives significant improvement in the oxidation. Steel-T21 was coated with germanium-doped aluminizing-siliconizing. Diffusion coating was carried out at 1050C for 6 h under an Ar atmosphere by simultaneous germanium-doped aluminizing-siliconzing process. Cyclic oxi...

Reliable cementation of fixed prosthetic restorations represents one of the most sensitive and crucial tasks during the prosthetic dental treatment with desirable long term clinical success. Because of its particular structure, zirconia restorations require a special conditioning before cementation in order to achieve a strong bond to dental structure. The lack of information about adhesive cem...

This work designs a silica (SiO2) layer on molybdenum metal core to provide new insights the corrosion resistance of silica/silicide coating in Ni-based superalloy. The substrate coated with MoSi2 by pack cementation was pre-oxidized fabricate cristobalite scale surface and preoxidation specimens were chosen examine corrosion-resistant property using DSM11 superalloy at 1550 °C. In order prepar...

It is difficult to obtain high quality samples of natural material covering a range of densities and degree of cementation, so study on the sample preparation techniques with similar mechanical properties of natural samples are very important. Experiments were carried out to study the effects of cementation of different materials on the mechanical properties of calcareous sand, e.g., the effect...