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Beryllium is a specific metal, its atomic configuration is ls 1 2s 2 and affects the shape of s valence band and p valence band because there is no electron in the p sublayer, which dimers bond length is 11% more than inside and (0001) atomic spacing shows 6% abnormal expansion. Compared with other elements, beryllium shows abnormal surface properties which the surface adsorption energy is up to 3.32 eV/atom due to electron exciting from s layer to p layer in the solid. In this paper, the adsorption and oxidation properties for Be and Be/00Cr17Ni14Mo2 stainless steel bonding joint were investigated by auger electron spectroscopy (AES) and two secondary ion mass spectrometry (SIMS). The results show that Beryllium, welding seam and 00Cr17Ni14Mo2 stainless steel matrix with beryllium adsorbed strongly in C and O then seriously oxidized even in super high-vacuum atmosphere, whose compounds remained in the welding joint and formed inclusion and segregation, and resulted in reducing bonding strength. Thus, pretreatment of beryllium surface and control of bonding atmosphere are significantly important, which can determine directly the success or failure of diffusion bonding for Be/00Cr17Ni14Mo2 stainless steel, and provides a guide for beryllium welding with other material.

The surface adsorption for Be and Be/00Cr17Ni14Mo2 stainless steel welding joint by diffusion bonding