AES investigations of fracture surfaces of aluminium doped sintered molybdenum rods

Abstract

The addition of aluminium to K, Si-doped molybdenum leads to higher potassium and silicon contents in the final sintered rods. The increase is proportional to the Al-concentration. The increase of potassium and silicon is caused by the formation of potassium-alumosilicates and potassium aluminates which were identified by AES. The addition of A1³⁺ surprisingly shows a strong gettering effect on grain boundaryoxygen. The long interconnected system of pores in the sintered rod, causing splitting etc., is destroyed by addition of aluminium.