Thermal Shock Resistance of Low Carbon MgO-C Refractories Bonded by an Fe Modified Phenol Resin

摘要

In order to overcome the problems of low carbon MgO-C refractories' thermal shock resistance decreasing, a possible way is to in-situ formation of one-dimensinal nanostructure in the matrix.The effects of the preparation technology of Fe catalyst, content of the Fe catalyst and coked temperature on the microstructure and thermal shock resistance of low carbon MgO-C refractories bonded by an Fe modified phenol resin was investigated.The results show that catalytic activity of Fe catalyst is improved significantly by mechanical activation method (presenting Fe nanosheets).Well-crystallised carbon nanotubes (CNTs) of 50-100 nm in diameter and of micrometre scale in length could be generated at 1000 ℃ in the matrix of low carbon MgO-C refractories bonded by the Fe nanosheet-modified phenol resin.The thermal shock resistance at 1000-1400 ℃ of the specimens with 0.5 wt％ Fe nanosheets catalyst are greatly improved compared with specimens without Fe catalyst.The results are attributed to in-situ formation of CNTs and the subsequent generation of bridging and crack deflection mechanisms in the matrix.