Search

boron carbide–cerium boride porous composites are prepared by hot pressed sintering, and mechanical properties and microstructure of boron carbide–cerium boride porous composites were tested. The results show that Flexibility strength of B4C-CeB6 porous composites is greatly improved compared with that of monolithic porous boron carbide. B4C react with CeO2 to completely form CeB6 in porous composites. CeB6 particles in B4C grain boundary are produced by in-situ reaction. The presence of CeB6 reinforcing particles could also suppress growth of B4C grains which normally leads to improved strength.

o make full use of magnesium slags, the C2AS-CAS2 composite pavement bricks were sintered by using magnesium slags, kaolin and Al2O3 at normal pressure. The phases, microscopy, size deviation, compressive strength and anti-hydration property of samples were analyzed using XRD, FE-SEM, EDS, mechanical testing and others techniques. The results show that the main phases of the samples are C2AS and CAS2; the transverse contraction is 3.5%, while the longitudinal shrinkage is 4.2%; the compressive strength is up to 65.3Mpa; the samples have well anti-hydration property. The C2AS-CAS2 composite pavement bricks have excellent properties.

The thermal shock and hydration resistance property of the light heat-insulation refractory materials is studied, which were prepared using high calcium magnesia slag as main raw materials. The phases and microscopy were characterized by means of X-Ray diffraction (XRD), field emission scanning electron microscope (FE-SEM). The results show that the main crystalline phase is CAS2, and it is with low volume density, excellent thermal shock and hydration resistance property.

CAS2-Al2O3 (Anorthite-alumina) refractory materials were prepared with magnesium slag, kaolin from Shanxi province of China and alumina as raw materials. The effects of sintering temperature, holding time and the rate of heating on the microscopic structures were investigated. The results showed that the sintering temperature and holding time are more important to CAS2-Al2O3 refractory materials than the rate of heating in a certain extent. According to XRD and SEM analysis results, it indicates that CAS2 and Al2O3 are the main phases which occurs in the temperature ranges of 1350-1400°C. The higher the sintering temperature is, the greater the grains grow. At the same time, while the temperature rising, it tends to precipitate the alumina particles. It is appropriate to keep 2h in 4°C/min heating rate at sintering temperature. CAS2-Al2O3 refractory materials have porous mesh structure.