无机材料学报 ›› 2020, Vol. 35 ›› Issue (6): 661-668.DOI: 10.15541/jim20190359
所属专题: 结构陶瓷论文精选(二)
张志刚1,2,卢晓通1,2,刘金莉1,2
收稿日期:
2019-07-13
修回日期:
2019-08-13
出版日期:
2020-06-20
网络出版日期:
2019-09-04
作者简介:
张志刚(1983-), 男, 讲师. E-mail: zhangzg@smm.neu.edu.cn;基金资助:
ZHANG Zhigang1,2,LU Xiaotong1,2,LIU Jinli1,2
Received:
2019-07-13
Revised:
2019-08-13
Published:
2020-06-20
Online:
2019-09-04
Supported by:
摘要:
采用注浆成型和无压烧结技术制备铝电解测温热电偶NiFe2O4陶瓷U型保护套管, 对浆料稳定性、生坯烧结行为和组装热电偶的测温性能进行了研究。结果表明: 添加10wt% NiFe2O4纳米粉和5wt%纳米粘结剂能有效提高浆料体系的Zeta电位, pH在10.0~11.0之间时浆料体系的稳定性较好。升温至1100 ℃以上生坯开始大量收缩, 随烧结温度的升高线收缩和线收缩速率逐渐增大, 在1300 ℃时线收缩速率达到最大值; 烧结初期活化能为295.11 kJ·mol -1, 受体积扩散和晶界扩散共同控制。测温结果表明组装热电偶在升降温过程中温度响应及时, 具备良好的抗熔盐腐蚀性能和抗热震性能, 满足工业铝电解测温热电偶套管的要求, 具备工业应用前景。
中图分类号:
张志刚,卢晓通,刘金莉. NiFe2O4陶瓷U型套管的注浆成型和无压烧结[J]. 无机材料学报, 2020, 35(6): 661-668.
ZHANG Zhigang,LU Xiaotong,LIU Jinli. NiFe2O4 Ceramic U-shaped Sleeve Prepared by Slip Casting and Pressureless Sintering[J]. Journal of Inorganic Materials, 2020, 35(6): 661-668.
Position | Particle size/μm | ||
---|---|---|---|
D10 | D50 | D90 | |
Slurry | 0.45 | 2.51 | 5.35 |
TopⅠ | 0.46 | 2.51 | 5.33 |
TopⅡ | 0.45 | 2.52 | 5.34 |
MiddleⅠ | 0.46 | 2.52 | 5.36 |
MiddleⅡ | 0.46 | 2.53 | 5.34 |
BottomⅠ | 0.46 | 2.52 | 5.36 |
BottomⅡ | 0.46 | 2.52 | 5.34 |
表1 浆料和生坯不同部位的粒度分布
Table 1 Particle size distribution in different positions for the same green body
Position | Particle size/μm | ||
---|---|---|---|
D10 | D50 | D90 | |
Slurry | 0.45 | 2.51 | 5.35 |
TopⅠ | 0.46 | 2.51 | 5.33 |
TopⅡ | 0.45 | 2.52 | 5.34 |
MiddleⅠ | 0.46 | 2.52 | 5.36 |
MiddleⅡ | 0.46 | 2.53 | 5.34 |
BottomⅠ | 0.46 | 2.52 | 5.36 |
BottomⅡ | 0.46 | 2.52 | 5.34 |
T/℃ | -1/(m+1) | CR |
---|---|---|
1150 | -0.396 | 0.995 |
1175 | -0.401 | 0.998 |
1200 | -0.403 | 0.990 |
1225 | -0.397 | 0.991 |
1250 | -0.396 | 0.994 |
Average | -0.399 | — |
表2 不同温度ln(ΔL/L0)T ~ lnC拟合直线斜率和线性回归系数
Table 2 Values of slope and linear regression coef?cient (CR) of relationship between ln(ΔL/L0)T and lnC under different temperatures
T/℃ | -1/(m+1) | CR |
---|---|---|
1150 | -0.396 | 0.995 |
1175 | -0.401 | 0.998 |
1200 | -0.403 | 0.990 |
1225 | -0.397 | 0.991 |
1250 | -0.396 | 0.994 |
Average | -0.399 | — |
Heating rate/(K·min-1) | a | CR |
---|---|---|
5 | -14049 | 0.990 |
10 | -14165 | 0.987 |
20 | -14279 | 0.985 |
Average | -14164 | — |
表3 不同升温速率ln[(ΔL/L0)/T] ~ 1/T曲线拟合直线斜率a和线性回归系数CR值
Table 3 The values of slope (a) and linear regression coef?cient (CR) of relationship between ln[(ΔL/L0)/T] and 1/T at different heating rates
Heating rate/(K·min-1) | a | CR |
---|---|---|
5 | -14049 | 0.990 |
10 | -14165 | 0.987 |
20 | -14279 | 0.985 |
Average | -14164 | — |
图8 测温腐蚀不同时间的NiFe2O4陶瓷表面F元素分布图和电解质中Ni含量
Fig. 8 Distribution diagrams of F element in the surfaces of NiFe2O4 ceramics and Ni contents in electrolysis after corroded different periods
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