This study investigates the effect of ZrB2 additions on microstructure, thermal stability, and thermo-mechanical wear resistance polycrystalline diamond. Following high-pressure high-temperature (HPHT) sintering, ZrB2-PCD material binder phase consisted cobalt-boride (Co2B B6Co23) phases. In-situ PXRD TEM vacuum annealing experiments observed that onset bulk graphitisation occurred above 1000 °...

A ZrB2-based ceramic, containing short Hi-Nicalon SiC fibers, was fabricated with a Mo-impermeable buffer layer sandwiched between bulk and the outermost oxidation resistant ZrB2–MoSi2 layer, in order to prevent inward Mo diffusion associated fiber degradation reactions. This additional consisted of ZrB2 doped either Si3N4 or polymer-derived ceramics (PDCs) SiCN SiHfBCN. Scanning electron micro...

ZrB2/Mo multilayers were prepared by the magnetron sputtering technique on Si (100) and Al2O3 (001) substrates. The friction behavior wear mechanism of tested at variable modulation ratios (tZrB2:tMo) 1:1 to 8:1 different temperatures. Under influence an effective ratio temperature, coefficient hardness showed almost opposite change rule, that is, higher hardness, lower coefficient. elastic mod...

Understanding the behavior of ultra-high temperature ceramics (UHTCs) against oxidation is particular importance in high-temperature applications. In this study, ZrB2–SiC–HfB2 UHTC composites were fabricated by spark plasma sintering (SPS) method at different temperatures, times, and pressures to investigate effects process variables on their resistance. Before tests, as-sintered samples contai...

In this work, the ablation behavior of monolith ZrB2-30 vol%SiC (Z30S) composites were studied under various oxy-acetylene flame angles. Typical oxidized microstructures (SiO2/SiC-depleted/ZrB2-SiC) observed when to Z30S was arranged vertically. However, formation outmost glassy SiO2 layer hindered tilted. The SiC-depleted region fully exposed air with reduced thickness highly Traces ablated an...

In this research work, the possibility of semi industrial production of Al-TiB2 and Al-ZrB2 composites, using reactive slag in a flame furnace have been investigated. For this purpose, commercial pure aluminum and powder mixture of TiO2 (ZrO2) , KBF4 and Na3AlF6 were used. The results showed that using a proper ratio of slag forming materials as well as proper amounts of the above-mentioned com...

In this research work, the possibility of semi industrial production of Al-TiB2 and Al-ZrB2 composites, using reactive slag in a flame furnace have been investigated. For this purpose, commercial pure aluminum and powder mixture of TiO2 (ZrO2) , KBF4 and Na3AlF6 were used. The results showed that using a proper ratio of slag forming materials as well as proper amounts of the above-mentioned com...