Entity

Time filter

Source Type


Li Y.,ANH Tianjin Refractories Co. | Han B.,ANH Tianjin Refractories Co.
China's Refractories | Year: 2013

Optical microscopes with polishing equipment possess high performance/cost ratio for refractories industry. Here, the preparation of polishing sections of refractory materials and products and their observation under microscopes were introduced in detail. The observation of microstructures helps to improve and optimize production process. Optical microscopes can observe (1) homogenous or inhomogeneous composition distribution to improve mixing intensity; (2) coarse grains contact or not and contacted grain edges broken or intact to adjust the pressing parameters to avoid overpressure; (3) the filling degree of components to optimize the particle size distribution; (4) the sintering necks and bridges and matrix shrinkage status to adjust sintering intensity or sintering atmosphere; (5) the crack edge in round or sharp to know when the cracks formed (before or after entering sintering zone) and take countermeasures; (6) used refractories to find the wear mechanism. Source


Han B.,ANH Tianjin Refractories Co. | Li Y.,ANH Tianjin Refractories Co.
China's Refractories | Year: 2012

The hot load deformation tests of four kinds of insulating fireclay bricks were carried out using a high temperature creep furnace from Sinosteel Luoyang Institute of Refractories Research Co., Ltd. The testing load was fixed at 0. 069 MPa and the total testing time was within 6 h including the holding time of 1.5 h. The hot load deformation process of insulating fireclay bricks can be divided into three steps: (1) expansion step from room temperature to RUL T max; (2) quick shrinkage step between RUL Tmax and T test; 3) relatively slow shrinkage step during holding process. The deformation rate at the beginning of holding process (Doh) should be controlled within ±0. 1%. The hot load deformation testing temperature of insulating fireclay bricks was optimized as the value of RUL Tmax plus 220 °C. Source


Li Y.,ANH Tianjin Refractories Co. | Han B.,ANH Tianjin Refractories Co.
China's Refractories | Year: 2012

The influences of C/S mass ratio and kieserite impregnation on performance of 95-grade magnesia bricks prepared using sintered magnesia DBM95 as main starting material, silica fume and limestone as additives were researched. The cold and hot physical properties were tested according to Chinese standards on refractories. The hydration resistance was determined in a high pressure autoclave with 0. 55 MPa of water vapor pressure for different holding times qfO.5h,3h, and 5 h. The trial results show (1) adding silica fume to decrease C/S ratio from 0. 84 to 0. 33 improves sintering property; adding limestone to increase C/S ratio from 0. 84 to 1. 95 causes more pores and negatively influences physical properties: BD decreases, AP increases, MOR and CCS decrease generally, but HMOR increases obviously; (2) for non-impregnated specimens, adjusting C/S mass ratio can not improve hydration resistance; (3) the impregnation with kieserite solution can improve hydration resistance of magnesia bricks significantly. Source

Discover hidden collaborations