期刊
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
卷 -, 期 -, 页码 -出版社
WILEY
DOI: 10.1111/ijac.14454
关键词
gel casting; low-viscosity slurry; porous TiC; Si3N4 composites; mechanical properties; wave-absorption properties
The gel-casting process was successfully applied to porous Si3N4 wave-absorbing composites in order to address the lack of suitable conformal, load-bearing, light-weight, and high temperature-resistant integrated wave-absorbing composites for complex conditions. A universal low-slurry for gel casting was prepared by using two dispersants acting together, ensuring the smooth completion of the gel casting process. Reasonable parameters of the rubber discharge process were given to avoid the problem of the green body swelling and cracking, resulting in the successful preparation of porous TiC/Si3N4 composites.
In view of the lack of conformal, load-bearing, light-weight, and high temperature-resistant integrated wave-absorbing composites suitable for extremely complex conditions, the gel-casting process was successfully applied to porous Si3N4 wave-absorbing composites in this work. A universal low-slurry for gel casting was prepared by using two dispersants acting together (tetramethylammonium hydroxide solution and sodium lauryl sulfate), which ensured the smooth completion of the gel casting process. Combining the thermogravimetric and differential thermal gravity curves of the composite green body, reasonable parameters of the rubber discharge process are given to avoid the problem of the green body swelling and cracking. The porous TiC/Si3N4 composites were successfully prepared by holding them at 1650 degrees C for 3 h. The bending strength, density, minimum reflection loss, absorption bandwidth, and matched thickness in the P-band of the composites with 30 wt.% TiC addition were 54.08 +/- 3.02 MPa, 1.906 g/cm(3), -37.75 dB, 1.9 GHz, and 4.1 mm, respectively. The electromagnetic wave loss mechanisms of the composites are a combination of conductivity loss, multiple reflections and scattering, interfacial polarization, and defect polarization.
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