Diffusion weldability of IN738LC with alloyed layer on bonding surface by boron pack cementation.

Boriding of In-738 Superalloy via the Pack Cementation Method and the Study of the Kinetic of Boride Layer Formation

In this study, mechanism and kinetic of formation of boride layer on In-738 superalloy were investigated via diffusion pack cementation method. Boriding was carried out at 900 °C for several short times (5, 15, 45 and 60 min). Phase study by means of X Ray defragtion (XRD) indicated that in addition to Ni3B, other phases such as Cr5B3, AlB2, and W2B were formed at the first period of process, a...

Resin cementation of zirconia ceramics with different bonding agents

The aim of this study was to evaluate the effects of sandblasting and different chemical bonding agents on shear bond strength of zirconia and conventional resin cement. In this study, 35 zirconia specimens were treated as follows: Group I: control; Group II: sandblasting; Group III: sandblasting + Monobond S; Group IV: sandblasting + Monobond Plus; Group V: sandblasting + Z-Prime Plus. The spe...

In-Situ Soil Cementation with Ureolytic Bacteria by Surface Percolation

Bonding in Boron Hydrides

Unique preferred localized valence structures for B2H6, B4H10, B5H,, and B6H10 have been found from accurate self-consistent field wavefunctions by maximizing Coulomb repulsions of electron pairs within orbitals. Objective evidence has thus been obtained for two-centre BH, three-centre bridge BHB, two-centre BB and central three-centre BBB bonds, but not, as yet, for open three-centre BBB bonds...

evaluation of fat atrophy in patients with dermis fat graft of orbit by ct-scan

چکیده ندارد.