An approach for matrix densification based on particle packing and its effect on lightweight Al2O3-MgO castables

作者：Zou, Yang; Gu, Huazhi; Huang, Ao^*; Zhang, Meijie; Lian, Pengfei

来源：Ceramics International, 2016, 42(16): 18560-18567.

DOI：10.1016/j.ceramint.2016.08.197

• Castable matrix
• Particle size distribution
• Dense packing
• Microstructure
• Slag resistance

For lightweight refractory containing lightweight aggregates, the properties of the matrix are decisive to its performance. In the present work, Dinger-Funk equation was adopted to calculate the theoretical packing density of a castables matrix based on Stovall linear packing model and to design its particle size distribution. Four lightweight AL(2)O(3)-MgO castables with different particle size distribution (represented by q-value) were prepared and examined. Results show that a suitable q-value was needed to ensure acceptable properties including sintering characteristics, strength and slag resistance, which deteriorated distinctly at high q (> = 031). For the sample with q = 0.28, the matrix showed dense and uniform mirostructure, and the properties of castable reached a favourable compromise among sintering characteristics (apparent porosity = 14.8%, bulk density = 3.02 g cm(-3), permanent linear change < 0.6%), strength (cold modulus of rapture = 12.4 MPa, cold crashing strength = 155.5 MPa), and resistance against both slag corrosion (I-c = 22.4%) and penetration (L = 11.5%). The sample with q = 0.25 showed the highest strength and resistance against slag corrosion (matrix dissolved in slag), but its slag penetration resistance was lower due to the existence of cracks between aggregates and matrix.

• 出版日期2016-12
• 单位武汉科技大学