Full
ZHANG Chenglin (1995-), female, Master candidate. E-mail: zcl13519117225@163.com
Outline
In order to solve the problem of high porosity of refractory castables due to the poor water wettability, graphite flakes (GF) were coated by TiC using titanium powders (Ti) via self-propagating high-temperature synthesis (SHS). The phase composition and microstructure of the products were investigated by X-ray diffraction, scanning electron microscopy and energy dispersive spectrometry. The water wettability of TiC-coated GF (CT) was evaluated by Zeta potential measurement, sedimentation test and water contact angle measurement, respectively. The results show that TiC coating with a continuous and uniform thickness of 763 nm is formed on the GF surface. Compared to uncoated GF and the sample with n(GF):n(TiC)=1:1 (GT) prepared by mechanical mixing, the sample CT has the maximum Zeta potential value, no delamination occurs when the sample CT disperses in water, and the contact angles with water is 26°. In addition, the physical properties, oxidation resistance and slag corrosion resistance of Al2O3-MgO refractory castables with GF, GT, and CT as well as castables without graphite (labled as CGF, CGT, CCT, and C0, respectively) were also determined. The apparent porosity of CCT castable is 13.4%, which is 39.37% and 11.26% lower than that of CGF and CGT castables, respectively. The decarbonized depth of CCT castable is 8.0 mm, which is 14.89% and 8.05% lower than that of CGF and CGT castables, respectively. The slag corrosion area of CCT castable is 29% , which is 19.44%、6.45% and 3.33% lower than that of C0, CGF and CGT castables, respectively.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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