Effect of titanium on high temperature oxidation esistance of niobium based alloy

As a criterion of the integrated oxide on pure metals, pilliingbedworth ratio (PBR) is one of the main reasons of generating the growth stress in the scale. In order to evaluate the value of PBR for the oxide formed on alloys, a simple model had been established; and the value of Nb₂O₅，Ti₂Nb₁₀O，TiNb₂O₇ and O₂had been evaluated. The results show tthat high temperature oxidation resistance of the alloy is improved by applying with Ti. Type and content of the oxide, which cause the PBR of the scale alter are changed as the content of Ti increases. It is concluded that the PBR of the scale has been decreased accompanied by increasing of Ti, making the scale not be cracked, which induces the scale and has a better protective effect on the matrix.