| 1 | Effects of Dispersive Agent and Alumina Micropowder on Workability of Al_2O_3-MgO Castables for Steel Ladles显示文摘This work aims at enhancing the workability of Al2 O3-Mg O castables. Al2 O3-Mg O castables were prepared using tabular alumina particles( 5-3,3-1,≤1 mm),tabular alumina fines( ≤0. 088 mm),fused magnesia( ≤1 mm),reactive alumina micropowder( PFR40,PBR,and CL) and calcined alumina micropowder( AC34 B5 and CT) as the main starting materials,calcium aluminate cement( Secar71) as the binder,and polycarboxylic acid water reducer WS,FS,and AD as the dispersive agent,respectively. Effects of three dispersive agents addition( 0. 4 mass% WS,0. 2 mass% FS and 1 mass% AD),two kinds of reactive alumina micropowder addition( PFR40 and PBR),composite alumina micropowder addition( PFR40-AC34 B5 and CL-CT,the mass ratio from 9/0 to 3/6)on the flow value,apparent porosity,bulk density,cold crushing strength and cold modulus of rupture of Al2 O3-MgO castables were investigated. The results show that:( 1) with PBR or PFR40,the castables with0. 4 mass% WS own better performance than those with0. 2 mass% FS or 1 mass% AD;( 2) compared with the castables with CL-CT composite powder, the castables with PFR40-AC34 B5 composite powder have slightly higher flow value; with the decreasing ratio of PFR40 and AC34 B5,or the decreasing ratio of CL andCT,the castables have declined flow value and the dried castable specimens have decreased density but the mildly changed strength; in consideration of the high price of reactive alumina,a proper compositing ratio shall be selected. | WANG Qingheng LI Yuanbing WEI Hao XU Nana LI Shujing LUO Han XIANG Ruofei | 2018 | China's Refractories2018，27，3： | 0 |
| 2 | Effect of Pyrophyllite Addition on Properties of Lightweight Insulation Refractory Materials显示文摘To solve the problem of over-high density of lightweight insulation refractory bricks prepared with fly ash,new lightweight insulation refractory materials with density < 0. 89 g·cm^(-3) were synthesized using pyrophyllite,fly ash,and Suzhou clay as the main starting materials and saw dust as the pore forming substance,and controlling the addition of the pyrophyllite( 20%,30%,and 40% by mass) and the treating temperature( 1 250,1 300,1 350,and 1 400 ℃). The synthesized materials were characterized by the XRD,SEM and the thermal conductivity measuring instrument. The results show at pyrophyllite addition of 30% and treat temperature of 1 400 ℃,the material can achieve linear shrinkage of 6. 6%,apparent porosity of 57%,bulk density of 0. 75 g·cm^(-3),compressive strength of 2. 7 MPa,and thermal conductivity at 350 ℃ of 0. 152-0. 216 W·( m·K)^(-1). This indicates that the pyrophyllite decomposition at high temperatures forms mullite and amorphous quartz introducing volume expansion,which counteracts some shrinkage at high temperatures.So it is feasible to use pyrophyllite,fly ash waste and clay to prepare lightweight insulation refractory materials. | CHEN Ruoyu LI Yuanbing XIANG Ruofei LI Shujing FAN Xiafei LI Yawei SANG Shaobai | 2017 | China's Refractories2017，26，3： | 0 |
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