Mechanical properties of Al2O3–SiC–C composites using polycarbosilane as SiC precursor

In situ preparation of Al2O3–SiC nanocomposites via sol–gel method followed by pressureless sintering

“…According to this analysis [23], G r for reaction (1) keeps negative at the temperature higher than 700 • C. So at any temperature higher than 700 • C mullite can be formed. For reaction (2), G r decreases with increasing tempera- ture and turns negative when temperature rises to 1560 • C. It shows that in situ SiC can be synthesized through mullite and carbon reaction above 1560 • C and there is no possibility of existence of mullite at 1600 • C. This is in agreement with the peaks indicated in XRD patterns at 1600 • C. Fig. 5(a) shows the SEM micrograph of the calcined powder at 800 • C for 1 h and then ball-milled for 1 h. It was observed that most of the particles were spherical and in the range of 70-130 nm.…”

“…Alumina based ceramic matrix composites have shown excellent refractoriness, high oxidation resistance and good mechanical properties at elevated temperatures [1][2][3][4]. Reinforcement of alumina ceramics by nanosized reinforcing agent results in increasing the creep resistance, strength and toughness [4][5][6][7][8][9].…”

Effect of aggregate type on the mechanical properties and slag resistance of Al2O3‐SiC‐C hot metal ladle bricks

“…1 The required mechanical properties and slag resistance of Al 2 O 3 -SiC-C bricks used in hot metal ladles have become increasingly stringent, owing to advances in hot metal pretreatment technology that aggravate slag corrosion and the mechanical damage caused by hot metal flow during hot metal pretreatment. 2 To this end, many scholars have studied the types of carbon materials 3,4 and SiC particle size [5][6][7] in the matrix and introduced a series of additives 8,9 into the material to form a relatively complete system. As aggregates are the "skeleton" of refractory materials, differences in aggregate chemical composition and microstructure will directly affect the refractory performance and service life.…”

“…To this end, many scholars have studied the types of carbon materials 3,4 and SiC particle size 5–7 in the matrix and introduced a series of additives 8,9 into the material to form a relatively complete system. As aggregates are the “skeleton” of refractory materials, differences in aggregate chemical composition and microstructure will directly affect the refractory performance and service life.…”

The influence of different SiC amounts on the microstructure, densification, and mechanical properties of hot‐pressed Al2O3‐SiC composites

“…The increments in the fracture toughness and hardness were associated with the microstructural evolvement and densification of the composite as well as the result of the silicon carbide nanoparticles dispensation. Shi et al 20 reported that nano-SiC particles play a key prominent role in the development of strength in monolithic Al 2 O 3 in comparison with the micro-SiC. So, the highest flexural strength was obtained for composites containing 1 wt% nano-SiC with polycarbosilane as the precursor.…”