CN113372122A - 一种高性能YTaO4喷涂粉的制备方法 - Google Patents
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Abstract
本发明涉及一种高性能YTaO4喷涂粉的制备方法，涉及耐火材料技术领域，采用喷雾造粒和回转窑高温热处理相结合的工艺制备YTaO4喷涂粉，其步骤包括：选取纯度大于99%的YTaO4微粉为主要原料；以PVA溶液为结合剂，采取喷雾造粒的方式进行造粒；利用回转窑对干燥后的造粒料进行高温处理（1650~1850℃），最终得到所述高性能YTaO4喷涂粉。采用喷雾造粒和回转窑高温热处理相结合的工艺，既保证喷涂粉了高的球化率和好的流动性，还保证了粉体较佳的抗烧结性，该法所得到喷涂粉的综合性能较佳。同时该制备工艺简单、生产成本相对较低，便于高性能YTaO4喷涂粉的大规模工业化生产。
Description
技术领域
本发明属于耐火材料技术领域，具体涉及一种高性能YTaO4喷涂粉的制备方法。
背景技术
随着燃气轮机及航空发动机的急速发展，其工作温度不断提升需要热障涂层材料为发动机中的高温合金零件提供良好的热防护。当前广泛应用的热障涂层材料氧化钇稳定氧化锆(YSZ)，由于相变其使用温度仅为 1200 ℃且热导率较高已经无法满足当前发动机对热障涂层材料的要求，研究具有更好热学和力学性质的新型热障涂层材料势在必行。
YTaO4作为一种新的铁弹体陶瓷热障涂层材料，其使用温度可达 1600 ℃，兼具有优异的高温相稳定性及力学性能、相变前后体积变化小等优点，更重要的是其热导率低于YSZ 及其它的热障涂层候选材料，这使得稀土钽酸盐陶瓷成为一种新型的热障涂层候选材料。
关于YTaO4材料的研究报道主要集中在材料的合成和性能研究，目前还关于高性能YTaO4喷涂粉的研究报道较少。
发明内容
针对现有技术存在的不足，本发明的目的在于提供一种高性能YTaO4喷涂粉的制备方法。
本发明为完成上述目的采用如下技术方案：
一种高性能YTaO4喷涂粉的制备方法，制备方法采用喷雾造粒和回转窑高温热处理相结合的工艺制备YTaO4喷涂粉，该法以纯度大于99.99％的YTaO4微粉为主要原料；加入去离子水和分散剂，搅拌均匀，得到浆料；所述浆料通过砂磨机球磨0.5~3 h，然后加入粘结剂和消泡剂，混合均匀后，得到待造粒浆液；所述待造粒浆液通过进料管输送，以使所述待造粒浆液通过雾化器雾化后喷入所述罐体，雾化后的所述待造粒浆液在所述罐体内与热气接触后，形成造粒粉；然后利用回转窑对干燥后的造粒料进行高温处理，最终得到所述的高性能YTaO4喷涂粉。
所述YTaO4微粉的粒径为0.5~15 um之间；
所述的分散剂为FS20或聚甲基丙稀酸胺，浓度为在0.2~0.6 %；
所述粘结剂为PVA溶液，浓度在2~6 %；
所述的消泡剂为二甲基硅油，用量为0.1~0.3；
所述喷雾造粒时所采用浆料的固含量在45~75%。
所述回转窑为燃气回转窑或电加热回转窑。
所述高温处理温度为1650~1850 ℃。
本发明提出的一种高性能YTaO4喷涂粉的制备方法，本发明喷雾造粒和回转窑高温热处理相结合的工艺制备YTaO4喷涂粉，其中喷雾造粒工艺可以得到球形度高、流动性好的粉末；之后的回转窑高温热处理既可以提高材料的抗烧结性，同时回转窑有一定倾斜度，球形粉高温处理时不容易结块，保留了粉末的球形度和流动性，最终得到性能优异的YTaO4喷涂粉。
附图说明
图1为实施例1所制得的高性能YTaO4喷涂粉的SEM照片。
具体实施方式
结合附图和具体实施例对本发明作进一步描述：
实施例1：
以纯度大于99.99％、平均粒径为1 um的YTaO4微粉为主要原料，加入去离子水、0.4%的聚甲基丙稀酸胺和0.1的二甲基硅油，搅拌均匀，放入砂磨机进行混合,在2500 r/h研磨2h，得到陶瓷浆料；其中，砂磨用研磨体为0.3〜0.4 mm氧化锆珠，球料质量比为1:1，料水质量比为1:1.5；加入与去离子水等量的PVA溶液（浓度为4%），继续混合20 min。把得到的浆料放入80 ℃的烘箱加热蒸发，保温至浆料固含量调整为 63 % 。利用喷雾干燥塔造粒，其中，喷雾干燥过程中，进风温度为220~240 ℃,出风温度90~105 ℃,雾化频率45Hz,得到YTaO4造粒粉。将所得到的造粒粉放入燃气回转窑中1700 ℃处理2 h得到高性能YTaO4喷涂粉。
本实施例1所制得的高性能YTaO4喷涂粉的SEM照片如图1所示。
实施例2：
以纯度大于99.99％、平均粒径为2 um的YTaO4微粉为主要原料，加入去离子水、0.3%的聚甲基丙稀酸胺和0.15的二甲基硅油，搅拌均匀，放入砂磨机进行混合,在2000 r/h研磨4 h，得到陶瓷浆料；其中，砂磨用研磨体为0.3〜0.4 mm氧化锆珠，球料质量比为1:1，料水质量比为1:1.5；加入与去离子水等量的PVA溶液（浓度为5 %），继续混合20 min。把得到的浆料放入80 ℃的烘箱加热蒸发，保温至浆料固含量调整为 66% 。利用喷雾干燥塔造粒，其中，喷雾干燥过程中，进风温度为220~240 ℃,出风温度90~105 ℃,雾化频率50 Hz,得到YTaO4造粒粉。将所得到的造粒粉放入燃气回转窑中1750 ℃处理2 h得到高性能YTaO4喷涂粉。
实施例3：
以纯度大于99.99％、平均粒径为3 um的YTaO4微粉为主要原料，加入去离子水、0.35%的聚甲基丙稀酸胺和0.1的二甲基硅油，搅拌均匀，放入砂磨机进行混合,在2300 r/h研磨4 h，得到陶瓷浆料；其中，砂磨用研磨体为0.3〜0.4 mm氧化锆珠，球料质量比为1:1，料水质量比为1:1.5；加入与去离子水等量的PVA溶液（浓度为5%），继续混合20 min。把得到的浆料放入80 ℃的烘箱加热蒸发，保温至浆料固含量调整为 60 % 。利用喷雾干燥塔造粒，其中，喷雾干燥过程中，进风温度为220~240 ℃,出风温度90~105 ℃,雾化频率55 Hz,得到YTaO4造粒粉。将所得到的造粒粉放入燃气回转窑中1800 ℃处理2 h得到高性能YTaO4喷涂粉。
实施例4：
以纯度大于99.99％、平均粒径为5 um的YTaO4微粉为主要原料，加入去离子水、0.4%的聚甲基丙稀酸胺和0.1的二甲基硅油，搅拌均匀，放入砂磨机进行混合,在2400 r/h研磨2h，得到陶瓷浆料；其中，砂磨用研磨体为0.3〜0.4 mm氧化锆珠，球料质量比为1:1，料水质量比为1:1.5；加入与去离子水等量的PVA溶液（浓度为3%），继续混合20 min。把得到的浆料放入80 ℃的烘箱加热蒸发，保温至浆料固含量调整为 70% 。利用喷雾干燥塔造粒，其中，喷雾干燥过程中，进风温度为220~240 ℃,出风温度90~105 ℃,雾化频率45Hz,得到YTaO4造粒粉。将所得到的造粒粉放入燃气回转窑中1800 ℃处理3 h得到高性能YTaO4喷涂粉。
Claims (8)
1.一种高性能YTaO4喷涂粉的制备方法，其特征在于：制备方法采用喷雾造粒和回转窑高温热处理相结合的工艺制备YTaO4喷涂粉，该法以纯度大于99.99％的YTaO4微粉为主要原料；加入去离子水和分散剂，搅拌均匀，得到浆料；所述浆料通过砂磨机球磨0.5~3 h，然后加入粘结剂和消泡剂，混合均匀后，得到待造粒浆液；所述待造粒浆液通过进料管输送，以使所述待造粒浆液通过雾化器雾化后喷入所述罐体，雾化后的所述待造粒浆液在所述罐体内与热气接触后，形成造粒粉；然后利用回转窑对干燥后的造粒料进行高温处理，最终得到所述的高性能YTaO4喷涂粉。
2.如权利要求1所述的一种高性能YTaO4喷涂粉的制备方法，其特征在于：所述YTaO4微粉的粒径为0.5~15 um之间。
3.如权利要求1所述的一种高性能YTaO4喷涂粉的制备方法，其特征在于：所述的分散剂为FS20或聚甲基丙稀酸胺，浓度为在0.2~0.6 %。
4.如权利要求1所述的一种高性能YTaO4喷涂粉的制备方法，其特征在于：所述PVA溶液的浓度在2~6 %左右。
5.如权利要求1所述的一种高性能YTaO4喷涂粉的制备方法，其特征在于：所述的消泡剂为二甲基硅油，用量为0.1~0.3。
6.如权利要求1所述的一种高性能YTaO4喷涂粉的制备方法，其特征在于：所述喷雾造粒时所采用浆料的固含量在45~75%。
7.如权利要求1所述的一种高性能YTaO4喷涂粉的制备方法，其特征在于：所述回转窑为燃气回转窑或电加热回转窑。
8.如权利要求1所述的一种高性能YTaO4喷涂粉的制备方法，其特征在于：所述高温处理温度为1650~1850 ℃。
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