摘要钛合金是具有高性价比的优质金属，用途广泛。传统的钛合金真空自耗电弧炉熔 炼法在工艺上存在不足之处，熔炼的成本也较高。而钛合金炉外精炼法是先对富钛矿 进行还原熔炼，再与炉外精炼相结合，该工艺成本低，但目前在实验室研究阶段。本 文研究钛合金炉外精炼渣系组分与熔点熔速的关系，旨在找出含钛精炼渣的最优配 比，在精炼过程中能够同时具备较低的熔化温度和较快的熔化速度，提高冶炼效果。81308

本文选用 CaO-SiO2-Al2O3-MgO-CaF2-TiO2 为基础渣系，使用 RDS-05 全自动炉渣 熔点熔速测定仪测量精炼渣试样的熔点和熔速，并使用正交分析法研究各组分对精炼 渣熔化温度和熔化速度影响的强弱规律。通过研究发现：

(1) 各组分对于渣样熔化温度影响的强弱顺序依次为：Al2O3＞碱度(CaO/SiO2)＞ TiO2＞MgO ＞CaF2。Al2O3 含量对于熔化温度的影响最为显著，当 Al2O3 含量为 3% 时，精炼渣的熔化温度最高，平均为 1282。2℃，当 Al2O3 含量为 5%时，精炼渣的熔 化温度最低，平均为 1221℃。而 CaF2 对熔化温度的影响最为平缓，当 CaF2 含量为 9%时，渣样熔化温度最低，平均为 1243℃；当 CaF2 含量为 10%时，渣样熔化温度最 高，平均为 1258。8℃。

(2) 各组分对于渣样熔化速度的强弱顺序依次为：碱度(CaO/SiO2)＞Al2O3＞TiO2

＞CaF2＞MgO。其中碱度(CaO/SiO2)对于熔化速度的影响最大，渣样熔化时间在碱度 (CaO/SiO2)水平为 1。19 处达到最高点，平均为 20。7min，此时熔速最慢；在 1。50 处降 到最低点，平均为 5。8min，此时熔速最快。MgO 含量对于渣样熔化速度的影响最小， 当 MgO 含量(%)在 6%~10%之间时，渣样熔化时间随着 MgO 含量(%)的增加而降低， 在 10%时降到最低点，此时渣样熔化速度最快。

(3) 最优渣系的配比为：碱度(CaO/SiO2)值为 1。33；Al2O3 含量为 6%；CaF2 含量 为 8%；MgO 含量为 9。5%；TiO2 含量为 5%。

毕业论文关键词：钛合金；熔点；熔速；精炼渣系

Abstract Titanium alloy is a high price of high quality metal, widely used。 Traditional titanium alloy vacuum consumable arc melting method deficiencies exist in the process, smelting high cost。 And titanium alloy furnace refining method is of rich titanium reduction melting, and out of furnace refining combined, low cost of the process, but the in the laboratory research stage。 The research of titanium alloy furnace refining slag component with the melting point and melting speed relationship, aims to find out the refining the optimal ratio of slag containing titanium, in the refining process can also have  lower  melting temperature and rapid melting speed, improve the smelting effect。

In this paper, the basic slag system was chosen as CaO-SiO2-Al2O3-MgO-CaF2-TiO2。 The melting point and melting rate of the refining slag sample were measured by RDS-05 full automatic slag melting point melting rate measuring instrument, and the influence of various factors on the melting temperature and the melting rate of refining slag was studied by orthogonal analysis。Through the study found:

(1)The order of the influence of the components on the melting temperature of slag samples is: Al2O3  > Alkalinity (CaO/SiO2) > TiO2  > MgO > CaF2。 Effect of Al2O3    content

on the melting temperature is the most significant when the Al2O3 content is 3%, refining slag melting temperature was the highest and average 1282。2℃ when the Al2O3 content is 5%, refining  slag  melting  temperature of the lowest, and  the average value was  1221℃。

The effect of CaF2 on melting temperature was the most gentle。 When the content of CaF2 was 9%, the slag sample melting temperature was lowest, and the average temperature was 1243℃。 When the content of CaF2  was 10%, the slag sample melting temperature was  the