Wuhan University

Meijie Zhang

Ao Huang

Huazhi Gu

Lvping Fu

Shenghao Li

Nan Li

Cangjuan Han

Yongshun Zou

Yanzhu Huo

The present disclosure provides a method for determining free radicals of CaO—AlOseries oxide melts. The method includes dividing the CaO—AlOseries oxide powder to into two aliquots by mass, putting into two identical corundum crucibles and tamping. The method also includes heating the two aliquots at the same high temperature in furnaces with and without a static magnetic field, respectively. Cylindrical samples with the same diameter and height, and only containing the melt at the bottom of the crucible and the slag reaction interface are drilled out from said two crucibles and ground into powder samples. The free radical relative content of the CaO—AlOseries oxide melts can be calculated from a ratio between the difference of the reaction mass contents of CaO in the two powder samples and the total mass content of CaO.

Method for determining free radicals in CaO—Al2O3 series oxide melts

The disclosure relates to a phase change thermal storage ceramic having high service temperature and improved utilization rate and utilization efficiency of heat. It is prepared at a low cost with a simple, easy-to-industrially-realized method. A mixture is obtained by mixing and stirring evenly 50-85 wt % of fused mullite powder, 10-45 wt % of pretreated aluminum-silicon alloy powder, and 3-8 wt % of ball clay. A ceramic body is formed by press molding the mixture at 80-150 MPa. The ceramic body is cured at 25-28° C. and a relative humidity of 70-75 RH for 24-36 h, dried at 80-120° C. for 24-36 h, and held at 1,100-1,300° C. for 3-5 h to prepare the phase change thermal storage ceramic. The pretreated aluminum-silicon alloy powder is prepared by holding aluminum-silicon alloy powder in water vapor at 0.02-0.20 MPa for 0.5-3 h to impregnate in an alkaline silica sol and drying the impregnated powder.

Phase change thermal storage ceramic and preparation method thereof

A titanium-containing calcium hexaaluminate material and preparation method thereof is disclosed. The technical solution is: using 60&#x2dc;80 wt % alumina micro powder, 5&#x2dc;20 wt % calcium-containing micro powder, 10&#x2dc;20 wt % titania micro powder and 1&#x2dc;10 wt % manganese oxide micro powder as raw materials, blending the raw materials evenly in a planetary ball mill to obtain a blend, machine pressing the blend at 100&#x2dc;200 MPa to obtain a green body, drying the green body at 110&#x2dc;200&#xb0; C. for 12&#x2dc;36 h, and incubating the dried green body at 1500&#x2dc;1800&#xb0; C. for 1&#x2dc;8 h to obtain the titanium-containing calcium hexaaluminate material. The present disclosure has low cost and simple process, and the prepared titanium-containing calcium hexaaluminate material has the characteristics of good chemical stability, high thermal shock resistance and strong melt resistance to titanium-aluminum alloy.

Titanium-containing calcium hexaaluminate material and preparation method thereof

The present disclosure relates to a magnesium-based raw material and a preparation method thereof. According to the technical solution, 40-60 wt % fused magnesia particles, 30-40 wt % fine monoclinic zirconia powder, 5-20 wt % fine zirconium oxychloride powder, 0.5-1.5 wt % calcium hydroxide nanopowder, 0.2-0.5 wt % calcium hydroxide nanopowder, and 0.1-0.3 wt % maleic acid are stirred for 15 min to mix well in a high-speed mixing mill at a constant temperature of 25&#xb0; C. to obtain a mixed powder; and the mixed powder is mixed through a ball mill at a constant temperature of 25&#xb0; C. for 3 min, roasted in a high temperature furnace at 250-400&#xb0; C. for 0.5-3 h, and finally cooled to room temperature.

Magnesium-based raw material with low thermal conductivity and low thermal expansion and preparation method thereof

A lightweight micro-closed-pore corundum composite refractory and a method preparing the same, wherein raw materials of the refractory comprise 95-99 parts by weight of &#x3b1;-AlOmicro-powder and 1-5 parts by weight of dolomite clinker; and additives of the refractory comprise 2-15 parts by weight of nano alumina sol, 5-15 parts by weight of a carbohydrate polymer, and 30-50 parts by weight of an organic alcohol. and the lightweight micro-closed-pore corundum composite refractory is prepared by: mixing and wet grinding the raw materials and the additives to obtain a slurry; placing the slurry in a mold, keeping the mold at 15-25&#xb0; C. for 6-12 hours and then keeping the mold at 60-90&#xb0; C. for 6-12 hours, then demolding; drying a demolded green body at 110-200&#xb0; C. for 24-36 hours, and keeping the green body at 1800-2000&#xb0; C. for 2-5 hours. A method preparing a lightweight micro-closed-pore corundum composite refractory is also provided. The lightweight micro-closed-pore corundum composite refractory of the present invention has characteristics of low bulk density, small average pore size, high closed porosity, low thermal conductivity, strong thermal shock resistance, abrasion resistance and slag resistance.

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Wuhan, China

Meijie Zhang