China molybdenum price has moved up significantly on April 23, 2023. For example, molybdenum oxide price has returned to above 3,000 yuan/mtu, and the prices of ferromolybdenum and ammonium heptamolybdate have also broken through the 200,000 yuan/ton mark again. The actual transaction volume also increased slightly.

Calvo et al. prepared W-Cr-Y ternary alloys with Cr content of 8 and 10 wt% and Y content of 0.3, 0.5 and 1 wt% by HIP technique and studied their oxidation behavior. The microstructure pictures of the HIPed alloy surface showed a fine surface structure and homogeneous composition. EDS analysis showed that most of the bright gray areas were Cr-rich phases, while the dark gray discontinuous areas were W-rich phase. The W-Cr-Y alloy has a lower grain size of 0.5-1 µm compared to the W-15Cr alloy. This suggests that the addition of Y can act as a grain growth inhibitor. In addition, nanoscale black Y₂O₃ particles were observed at the grain boundaries, which were caused by the decomposition of unstable oxides during the HIPing process.

Researchers have investigated the oxidation behavior of W-Cr-Nb ternary alloys and W-Cr-Zr ternary alloys. Suresh et al. reported the oxidation behavior of W-Cr-Nb ternary alloys at 1000°C for 15 hours (30 cycles). The microstructure results of different W-Cr-Nb alloys showed that W-Cr-Nb ternary alloys have high density and small amount of porosity, and their true density is 97.5-98.5% of their theoretical density.W-Cr-Nb ternary alloys are mainly composed of W-rich solid solution (WSS) and Cr₂Nb phases.

Garcia et al. produced W-Cr-Ti ternary alloys—WCr12Ti2.5 (wt%) alloys by MA and hot isostatic pressing (HIP) techniques and investigated the oxidation behavior of the alloy. The results showed that the Δ m/S of the WCr₁₂Ti_2.5 alloy was 1.25 × 10^-2 to 4 × 10^-2 times higher than that of the W-Cr alloy during the first 15 h of oxidation at 800 °C. In addition, the former is 2 × 10^-2 to 5 × 10^-2 times higher than the latter for the first 5 h of oxidation at 1000 °C. With increasing oxidation time, the oxide layer of the WCr₁₂Ti_2.5 alloy becomes thicker and its porosity gradually increases. In addition, the oxidized alloy has a similar cross-sectional structure, consisting of black, dark gray and light gray phases from inside to outside, respectively.