Properties of barium-calcium zirconate titanate ceramics-polymer composites
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摘要: 利用冷冻取向的方法制备得到了锆钛酸钡钙陶瓷的二维框架结构,通过在这个结构中填充聚醚酰亚胺(PEI),制备成一种陶瓷复合材料。结果发现:陶瓷浆料固体载荷量为30vol%时可以得到更好的陶瓷片层状二维结构体。其中,三羟甲基氨基甲烷盐酸盐(Tris-HCl)作为分散剂的分散效果较好。聚合物在陶瓷复合材料中的填充率受浆料的分散剂种类及填充液浓度的影响,复合材料介电常数大多在100 以下,而本实验制备的锆钛酸钡钙基陶瓷-聚合物复合材料的相对介电常数达到了446。结果表明:Tris-HCl的分散效果最好,此时,当聚醚酰亚胺/二氯甲烷(PEI/DCM)溶液的浓度为15wt%时,陶瓷复合材料的聚合物填充率最高(18.63%)。随着PEI填充率的增大,陶瓷样品的最大应变值增大,最大应力值减小;面内的导热系数则随温度的升高而升高,在保证其具有一定力学强度的同时,提高了材料的介电性能。Abstract: The two-dimensional framework structure of barium-calcium zirconate titanate ceramics was prepared by the freezing orientation method. The ceramic composite material was prepared by filling polyetherimide (PEI) into this structure. The results show that a better two-dimensional structure of ceramic sheets can be obtained when the solid loading of ceramic paste is 30vol%. Among them, TRIS hydrochloride (Tris-HCl) as a dispersant has a better dispersion effect. The filling rate of polymer in ceramic composites is affected by the type of dispersant and the concentration of the filling solution. The permittivity of most composites is below 100, while the relative permittivity of barium zirconate titanate ceramic/polymer composites prepared in this experiment is 446. It is found that Tris-HCl has the best dispersion effect. At this time, when the concentration of polyetherimide/dichloromethane (PEI/DCM) solution is 15wt%, the polymer filling rate of ceramic composites is the highest (18.63%). With the increase of PEI filling rate, the maximum strain value of the ceramic sample increases and the maximum stress value decreases. The in-plane thermal conductivity increases with the increase of temperature. Ensure that it has a certain mechanical strength and improves the permittivity of the material.
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Key words:
- freezing orientation /
- composite materials /
- polymer filling /
- dispersant /
- dielectric properties
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图 5 悬浮液分散剂为CE64时的陶瓷SEM图像:(a)固体载荷量为30vol%的冰晶生长方向;(b)固体载荷量为30vol%的冷冻方向;(c)固体载荷量为40vol%的冷冻方向;(d)固体载荷量为50vol%的冷冻方向
Figure 5. SEM images of ceramics with CE64 suspension dispersant: (a) Ice crystal growth direction with solid load of 30vol%; (b) Freezing direction with solid load of 30vol%; (c) Freezing direction with solid load of 40vol%; (d) Freezing direction with solid load of 50vol%
图 7 固体载荷量为30vol%时被聚合物填充后的陶瓷SEM图像:(a)分散剂为CE64,聚醚酰亚胺/二氯甲烷(PEI/DCM)溶液浓度为10wt%;(b)分散剂为CE64,PEI/DCM溶液浓度为15wt%;(c)分散剂为Tris-HCl,PEI/DCM溶液浓度为10wt%;(d)分散剂为Tris-HCl,PEI/DCM溶液浓度为15wt%
Figure 7. SEM images of ceramic filled with polymer when the solid loading is 30vol%: (a) Dispersant is CE64, the concentration of polyethylenimine/dichloromethane (PEI/DCM) solution is 10wt%; (b) Dispersant is CE64, the concentration of PEI/DCM solution is 15wt%; (c) Dispersant is Tris-HCl, the concentration of PEI/DCM solution is 10wt%; (d) Dispersant is Tris-HCl, and the concentration of PEI/DCM solution is 15wt%
图 12 陶瓷复合材料:(a)热容;(b)面间热扩散系数;(c)面内热扩散系数;(d)面间导热系数;(e)面内导热系数;(f)面间与面内方向示意图
Figure 12. Ceramic composites: (a) Heat capacity; (b) Inter-plane thermal diffusion coefficient; (c) In-plane thermal diffusion coefficient; (d) Inter-plane thermal conductivity; (e) In-plane thermal conductivity; (f) Inter-plane and in-plane direction diagram
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