Abstract
Alloys in the V-Si-B system are a new and promising class of light-weight refractory metal materials for high temperature applications. Presently, the main attention is focused on three-phase alloy compositions that consist of a vanadium solid solution phase and the two intermetallic phases V3Si and V5SiB2. Similar to other refractory metal alloys, a major drawback is the poor oxidation resistance. In this study, initial pack-cementation experiments were performed on commercially available pure vanadium and a three-phase alloy V-9Si-5B to achieve an oxidation protection for this new type of high temperature material. This advance in oxidation resistance now enables the attractive mechanical properties of V-Si-B alloys to be used for high temperature structural applications.
Highlights
In a previous study on the phase stability in the Mo-Si-B system it was determined that other refractory metals such as Nb, W and V are completely soluble in the MoSS phase and in the Mo5 Si3 (T1 ) and the Mo5 SiB2, (T2 ) phase [1]
As an initial approach samples of pure vanadium were processed by the two-step method
The pack-cementation process by silicon and boron co-deposition is known to produce oxidation resistant coatings on various refractory based alloys and cermets and is able to prevent those materials from catastrophic oxidation failure by the “pesting” phenomenon [27,28]
Summary
In a previous study on the phase stability in the Mo-Si-B system it was determined that other refractory metals such as Nb, W and V are completely soluble in the MoSS (solid solution) phase and in the Mo5 Si3 (T1 ) and the Mo5 SiB2 , (T2 ) phase [1]. Both W and Nb destabilize the Mo3 Si phase, but V is quite soluble in this phase. The oxidation resistance of V, like that of other refractory metals, is poor
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