无机材料学报 ›› 2023, Vol. 38 ›› Issue (4): 461-468.DOI: 10.15541/jim20220469
刘文龙1,2(), 赵瑾1,2(
), 刘娟1,2, 毛小建1,2, 章健1,2, 王士维1,2(
)
收稿日期:
2022-08-09
修回日期:
2022-11-25
出版日期:
2023-04-20
网络出版日期:
2022-12-09
通讯作者:
赵瑾, 助理研究员. E-mail: zhaojin@mail.sic.ac.cn;作者简介:
刘文龙(1997-), 男, 硕士研究生. E-mail: liuwenlong20@mails.ucas.ac.cn
LIU Wenlong1,2(), ZHAO Jin1,2(
), LIU Juan1,2, MAO Xiaojian1,2, ZHANG Jian1,2, WANG Shiwei1,2(
)
Received:
2022-08-09
Revised:
2022-11-25
Published:
2023-04-20
Online:
2022-12-09
Contact:
ZHAO Jin, lecturer. E-mail: zhaojin@mail.sic.ac.cn;About author:
LIU Wenlong (1997-), male, Master candidate. E-mail: liuwenlong20@mails.ucas.ac.cn
Supported by:
摘要:
为了解决常规干燥(控温控湿)过程中坯体出现水分梯度问题, 利用微波干燥法来干燥湿坯。通过对比常规干燥(温度: 40 ℃; 湿度: 60%)和微波干燥的方式, 研究了湿坯的重量损失、线性收缩、表面温度和水分分布。与常规干燥相比, 采用微波干燥(功率250 W)时, 干燥结束时间和停止收缩时间分别缩短至1/6.8和1/6。在微波干燥过程中, 样品表面温度随时间延长先升高后降低, 与体内水分密切相关。而在常规干燥过程中, 温度保持恒定在40 ℃。采用低场核磁共振(NMR)成像技术表征湿坯内部的水分分布情况发现: 在微波干燥过程中, 水分分布更均匀, 表明微波干燥时湿坯的干燥应力更低。在1550 ℃下烧结6 h后, 微波干燥制备得到的氧化铝陶瓷具有更高的抗弯强度, 且标准差更小。
中图分类号:
刘文龙, 赵瑾, 刘娟, 毛小建, 章健, 王士维. 微波干燥自发凝固成型氧化铝湿坯[J]. 无机材料学报, 2023, 38(4): 461-468.
LIU Wenlong, ZHAO Jin, LIU Juan, MAO Xiaojian, ZHANG Jian, WANG Shiwei. Microwave Drying of Spontaneous-Coagulation-Cast Wet Alumina Green Body[J]. Journal of Inorganic Materials, 2023, 38(4): 461-468.
Drying method | Microwave power/W | CRP/ h | Residual water after CRP/% (in vol.) | Residual water after drying/% (in vol.) |
---|---|---|---|---|
Conventional | — | 10 | (20.4±1.5) | 0.8 |
Microwave | 250 | 1.8 | (11.2±1.4) | 0.6 |
400 | 1.3 | (9.4±1.4) | 0.5 | |
550 | 1.0 | (7.7±0.7) | 0.4 |
Table 1 CRP and residual water (after CRP and drying) of samples
Drying method | Microwave power/W | CRP/ h | Residual water after CRP/% (in vol.) | Residual water after drying/% (in vol.) |
---|---|---|---|---|
Conventional | — | 10 | (20.4±1.5) | 0.8 |
Microwave | 250 | 1.8 | (11.2±1.4) | 0.6 |
400 | 1.3 | (9.4±1.4) | 0.5 | |
550 | 1.0 | (7.7±0.7) | 0.4 |
Drying method | Microwave power/W | Shrinkage stop time/h | Shrinkage/% |
---|---|---|---|
Conventional | — | 6.0 | (4.9±0.1) |
Microwave | 250 | 1.0 | (5.2±0.1) |
400 | 0.7 | (5.1±0.1) | |
550 | 0.5 | (4.8±0.1) |
Table 2 Shrinkage stop time and shrinkage of samples
Drying method | Microwave power/W | Shrinkage stop time/h | Shrinkage/% |
---|---|---|---|
Conventional | — | 6.0 | (4.9±0.1) |
Microwave | 250 | 1.0 | (5.2±0.1) |
400 | 0.7 | (5.1±0.1) | |
550 | 0.5 | (4.8±0.1) |
Fig. 7 Moisture distributions of wet alumina green bodies in the drying process (a) Conventional drying for 0, 2, 4, 8, and 15 h; (b) 250-W microwave drying for 0, 0.3, 0.6, 1.2, and 2 h
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