(重慶大學(xué) 材料科學(xué)與工程學(xué)院， 重慶 400044)
摘 要: 以CaO-SiO2-TiO2渣系為基礎(chǔ)配制了含鈦無氟結(jié)晶器保護渣， 為建立和優(yōu)化配置規(guī)律， 通過實驗測定熔渣的粘度和熔點， 研究了含鈦無氟保護渣熔化特性與助熔劑、 TiO2含量及二元堿度之間的關(guān)系。 結(jié)果表明： B2O3和堿金屬Na2O、 Li2O均能有效降低粘度和熔點,其中以B2O3作用最為明顯； TiO2含量為6%時， 粘度和熔點均呈最小值。 在4%~10%范圍內(nèi)， MgO可降低粘度， 但會使熔點升高； 含量＜3%時， MnO可降低粘度， 含量超過5%則會同時使粘度和熔點增加。
關(guān)鍵字: 二氧化鈦； 無氟結(jié)晶器保護渣； 粘度； 熔點
（College of Materials Science and Engineering, Chongqing University,
Chongqing 400044, China）
Abstract: Fluorine mostly comes from mold powders during the continuous casting process. Developing and using fluoride-free mold powders is of importance to the environmental protection. Fluoride fluxes were confected based on the CaO-SiO2-TiO2 slag system. In order to establish and optimize the confect rule of fluoride-free fluxes, the relationship between the melting properties of fluoride-free mold fluxes and fusing reagents, binary basicity and TiO2 content was investigated by measuring the viscosity and melting point of the melted slag. The experimental result indicates that the effective compositions in lowering the viscosity and melting point are B2O3, Na2O and Li2O, in which the effect of B2O3 is the most remarkable; When the content of titanium is 6% in mass, both the viscosity and melting point show the minimum, If the content of MgO is 4%-10%, it can reduce the viscosity but increase the melting point. MnO can help to reduce the viscosity when the content of MnO＜3%, but to increase the viscosity and melting point when the content of MnO＞5%.
Key words: titanium; fluoride-free mold fluxes; viscosity; melting point
