At the beginning of the week, the overall domestic molybdenum market was quiet. 

Analysis of latest tungsten market from Chinatungsten Online

China’s ammonium paratungstate (APT) and tungsten powder prices keep firm on May 5, 2023 mainly due to the strong rised mentality of tungsten raw material suppliers as well as the expected increase of long-term contract prices for the first half of May 2023. 

China’s domestic rare earth market maintains a weak and stable operation on May 6, 2023. Under the interweaving of many positive and negative factors, the negotiation atmosphere between buyers and sellers is slightly stalemate.

China’s ammonium molybdate, ammonium heptamolvbdate and molybdenum powder prices are relatively weak on May 6, 2023 mainly due to the general enthusiasm of downstream users to enter the market for inquiries and purchases, the rational shipment of suppliers, and the sideways operation of the international molybdenum market. 

Analysis of latest tungsten market from Chinatungsten Online

China tungsten price stabilizes in the first trading day after the holiday of Labor Day and most market participants are waiting for the new guidance from listed tungsten companies.

Analysis of latest tungsten market from Chinatungsten Online

In April 2023, China tungsten price stabilized in the first half of this month and then rose in the second half of this month. 

The overall China’s domestic rare earth market is still weak, mainly reflected in the slight decline in the prices of rare earth products such as praseodymium, neodymium, dysprosium and terbium and the actual transaction volume is small. 

China molybdenum price stabilizes in the first trading day after the holiday of Labour Day as most participants do not totally come back from the holiday. At present, the industry is focusing on the shipment situation of molybdenum mining enterprises and the bidding situation of steel enterprises.

In order to solve the problem of poor oxidation resistance of W and W-based alloys at high temperatures, this work gives self-passivating tungsten alloys and surface coating protection technology. Optimization of the preparation process of the alloy (heat treatment of HIPed alloy, etc.) can effectively reduce or eliminate its internal cracks and holes, thermal stresses and residual stresses, thus reducing its surface roughness and porosity. In addition, some beneficial elements (Ti, Zr, Y, Nb, etc.) can be added to improve the high-temperature strength of W-based alloys, slow down the diffusion of Cr cations, and promote the formation of oxide films.

Researchers summarize the effects of different coating preparation methods on the coating composition and oxidation behavior of W-based materials. It can be seen that the silicide coating consists mainly of a thick WSi₂ layer and a thin W₅Si₃ layer. The HAPC coating requires a longer time due to the relatively low diffusion temperature. After 4~15 hours of treatment at 1100 °C, the thickness of the coating is only 30~60 µm. However, using CVD technology, the thickness of the coating can reach 50~80 microns after 0.5~1 hour of deposition at 1200°C. In contrast, the HDS technique is very efficient for coating preparation. By depositing at 1500°C for 0.25~0.42 h, coatings with thicknesses of 36~88 µm can be obtained.