The process of preparing metallic matrix diamond tool bits by microwave pressureless sintering (MPS) was exclusively studied in this paper. The effects of the sintering temperature, the cold pressure, and the holding time on the mechanical properties of the bit were determined by using the response surface methodology (RSM) with Box-Behnken Design (BBD). In addition, with RSM, the second-order polynomial equation of mechanical properties was obtained. The solutions were well matched with the experimental values. This indicates that major variations in mechanical properties of the sintered sample could be predicted by the models, which shows that the applied model is accurate. Conventional pressureless sintering (CPS) experiments were also conducted to make a comparison. The experimental results showed that the MPS can enhance the mechanical properties of sintered samples. A possible MPS mechanism is proposed in this work after analyzing all the experimental results.

Oxidation treatment of PAN fibers (PFs) in a KClO ₃ /H ₂ SO ₄ system as a new pretreatment method for carbon fiber oxidation stabilization.

In this study, we report on the rapid preparation of WO₃ nanoplates decorated with noble metals and evaluate their gas-sensing performance using a high-throughput screening technique. The incorporation of Pd significantly enhanced the gas-sensing properties, and, among all of the samples tested, the WO₃ nanoplate containing 0.3 mol% Pd exhibited the highest response to 100 ppm xylene at 250 °C (R_a/R_g = 131.2), which was almost 56 times greater than that of the pure WO₃ sample. Additionally, this sample demonstrated rapid response and recovery times (τ_response = 3.9 s and τ_recovery = 189.2 s, respectively). The nanoplate samples were also classified and screened using cluster analysis, and the selected samples were optimized for use in a sensor array. By applying principal component analysis and Fisher discriminant analysis, four typical gases were identified and a potential sensitization mechanism was elucidated.