The development of low creep high alumina brick

 Low creep high alumina brick is an acquainted product for refractory material and steel making workers. In 1985,in order to realize the nationalization of refractory material for Baosteel second-stage construction, metallurgy organization pay more attention to the research the low creep high alumina brick reaching the Japanese level.

Until now, many factories can produce the higher quality low creep alumina brick for the blast furnace and cowper stove. The burdening of the most of homebred low creep alumina brick is to add the family of sillimanite materials, whose process is complicated and cost is higher.

Early guidance Tangshan Iron and Steel author refractory plant for Bao steel to develop low creep high alumina brick, but with pure silica powder as a secondary mullitization provenance, products in 1550 ℃ 0.2 MPa 50 h creep rate index level over Japan. There was no disclosure of the technical know how to add quartz. In fact, this is a lesson to be learned from an article in the Russian data. A Ukrainian Institute refractory low creep high alumina brick submitted on paper entitled. High alumina refractories with high creep resistance at temperatures. At first glance, the title seems to be no novelty, but its high-performance products. The technology index of industrial scale produced by this share company :w(Al2O3)>73%, show porosity ≥18%,compression strength >100Pa, Heavy softening temperature (0.5MPa)> 1750 ℃, the creep rate (1600 ℃ 1.5MPa24h) <0.09%.Here note load softening temperature and pressure values creep rate tests.

Low creep high alumina brick is generally cannot afford such high stresses. The products used in the lower temperature hot stove brick dome, more than 9.5 years of continued operations. Speaker did not introduce technical points, did not explain the materials used, but no mention of the addition of quartz. But between the lines describe a little trace impurities in the raw material properties, the industry can determine its so-called "purity of 99% SiO2" is quartz, quartzite and general purity. In fact, the use of fused alumina, activated alumina, and a quartz-based raw materials to manufacture non-uniform state technical essentials multiphase quartz reaction product is so fully realized mullite bonded corundum microstructure to achieve excellent high temperature performance.

Article Source: The development of low creep high alumina brick
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