Oxidation resistance and strength retention of ZrB2–SiC ceramics

Strength of hot pressed ZrB2–SiC composite after exposure to high temperatures (1000–1700 °C)

“…7,11,20 Formation of dendrites of ZrO 2 in agglomerates of ZrO 2 (Fig. 8b and c) on SiO 2 layer shows the precipitation of ZrO 2 from liquid, similar to the mechanism purposed by Karlsdottir et al 5,21,22 for transportation of ZrO 2 with borosilicate glass through convection cells.…”

“…[9][10][11][12] But there is a need to measure residual strength after exposure to a range of temperatures since the oxide layer structure changes with temperatures. The present work seeks to address this gap by measuring the dependence of residual bend strength on thermal exposure under oxidizing conditions at different temperatures and times.…”

Low‐Temperature Sintering of HfC/SiC Nanocomposites Using HfSi2‐C Additives

“…To decrease the sintering temperature and to improve the mechanical properties of HfC ceramics, secondary phases, such as MoSi 2 , TaSi 2 , and SiC, have been introduced . Among them, SiC has been widely used as the secondary phase for improving the microstructure and properties of ultra‐high‐temperature ceramics (UHTC), mainly because of its chemical stability and oxidation resistance at temperatures below 1500°C . Liu et al fabricated HfC‐30 vol% SiC ceramics with a relative density of 99.7% and an average grain size of ~1 μm using pressureless sintering (PLS) at 2300°C for 30 min.…”

Gözenekli ZrB2 Peletlerin Farklı Sıcaklıklardaki Oksidasyon Davranışları

“…Fakat yüksek yoğunluklu ZrB2 üretmek oldukça zordur. Son zamanlarda yapılan çalışmalar, SiC, MoSi2 veya TaSiO2 gibi Si-içerikli bileşikler ilave edilerek ZrB2'nin yoğunluğunu artırmak üzerine yoğunlaşmaktadır [2, [8][9][10][11]. Birçok metal ve bileşiklerin yüksek sıcaklıktaki oksitlenme tepkimeleri kinetik açıdan aşağıdaki matematiksel bağıntıyla (1) açıklanabilir:…”