采用线膨胀系数可控ZrO2-TiO2陶瓷模具的钛合金高精度超塑成形

航空材料学报, 2012, 32(4): 8-14. doi: 10.3969/j.issn.1005-5053.2012.4.002

采用线膨胀系数可控ZrO2-TiO2陶瓷模具的钛合金高精度超塑成形

蒋少松 ^1, , 赫晓东 ^2, , 张凯锋 ^3, , 高鹏 ^4, , 李保永 ^5,

1.哈尔滨工业大学材料科学与工程学院,哈尔滨150001

2.哈尔滨工业大学航天学院,哈尔滨150001

3.哈尔滨工业大学材料科学与工程学院,哈尔滨150001

4.哈尔滨工业大学材料科学与工程学院,哈尔滨150001

5.北京航星机器制造公司,北京100013

基金项目: 哈尔滨工业大学重点实验室开放基金(中央高校基本科研业务费专项资金资助(HIT.KLOF.2010043)

关键词：超塑成形 , 陶瓷模具 , 成形精度 , 线膨胀系数(LEC) , TC4钛合金

High Precision Superplastic Forming of Titanium Alloy Using ZrO2 -TiO2 Ceramic Die with Controllable Linear Expansion Coefficient

对线膨胀系数可控的ZrO2-TiO2陶瓷模具及钛合金高精度超塑成形进行了系统研究.探讨了TiO2体积分数和相对密度对ZrO2-TiO2陶瓷的线膨胀系数的影响规律,并引入相对密度修正模型-Turner模型来准确预测复合陶瓷材料的线膨胀系数.采用压痕法检测了与TC4钛合金等膨胀系数的ZrO2-TiO2陶瓷模具的超塑成形精度.在925℃下,利用ZrO2-TiO2陶瓷模具进行超塑成形,其使用性能良好.结果表明:ZrO2-TiO2陶瓷的线膨胀系数随TiO2体积分数的增加而减小,随相对密度的增加而增加.采用线膨胀系数优化的ZrO2-TiO2陶瓷模具,成形精度误差大幅降低,不超过0.1％,且陶瓷模具具有足够的热机械性能进行超塑成形,使用性能优良.

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