Papers by Keyword: Crushing Strength

Abstract: Starting from different sizes of magnesia and bauxitewith sodium hexametaphosphate as anchoring agent, specimens obtained by suppression were sintered at 1500°C and 1550°C and heat preservation for 3h in the electric hearth furnace, respectively. The effect of particle size distribution of magnesia and bauxite on the properties of magnesia-alumina refractory materials was investigated. The composition of magnesia-alumina refractory which consists of various particle size distributions was determined, according to Andreasen packing model, with distribution coefficient (q) of 0.15, 0.20, 0.25, 0.30, 0.35, 0.40 and 0.50. The fractographs of the specimen were observed by scanning electron microscopy. The linear rate of change, apparent porosity, bulk density and crushing strength of these specimens were studied. The results showed: a crushing strength of 52.39 MPa, an apparent porosity value of 15.55% and a bulk density value of 2.91 g/cm³ were obtained via a particle size distribution coefficient of 0.30 at 1550°C. Simultaneously, the refractory materials had small linear rate of change.

Abstract: Industrial solid residues and poor quality clay as main raw material were used to prepare porous ceramic balls by ceramics process with coal and wood powder as pore-forming additive to improve the porosity of the ceramics ball. Effect of pore-forming additive on the properties of ceramic ball was investigated. The phase composition and section morphology of the ceramics balls was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The apparent porosity and crushing force of the ceramic balls were tested by Archimedes hydrostatic weighing method and crushing strength tester respectively. The tested results showed that the apparent porosity of the porous ceramic balls mainly influenced by species and addition amount of the pore-forming additive. The apparent porosity increases with the adding of the pore-forming additive. The apparent porosity and crushing force of the optimized porous ceramic balls was 49.68% and 1.17 kN respectively, which is a potential candidate used for waste water filtration.

Abstract: The y-directional mechanical properties of hexagonal honeycombs with various cell-wall angles are explored. The results of both the quasi-static experiments and the dynamic simulations show that the cell-wall angle has a significant influence on the honeycombs’ mechanical properties, although the latter is dominated by the honeycombs’ relative density. This influence is weakened by the increase of the impact velocity. With retaining the honeycombs’ relative density as constant, the honeycomb with the cell-wall angle of about 45^o exhibits the optimal crushing strength and energy absorption capacity.