Effect of nano aluminum nitride filler on mechanical, thermal, and dielectric properties of the glass/mullite composites for low-temperature co-fired ceramic applications

BİLAÇ O., DURAN C.

Journal of the American Ceramic Society, vol.106, no.8, pp.4902-4910, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 106 Issue: 8
  • Publication Date: 2023
  • Doi Number: 10.1111/jace.19124
  • Journal Name: Journal of the American Ceramic Society
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Periodicals Index Online, Aerospace Database, Applied Science & Technology Source, Art Source, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, EBSCO Education Source, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.4902-4910
  • Keywords: dielectric properties, glass, ceramic composites, low-temperature co-fired ceramics, mechanical properties, nano aluminum nitride, tape casting, thermal properties
  • Ankara Yıldırım Beyazıt University Affiliated: Yes

Abstract

Mullite/glass/nano aluminum nitride (AlN) filler (1–10 wt% AlN) composites were successfully fabricated for the low-temperature co-fired ceramics applications that require densification temperatures lower than 950°C, high thermal conductivity to dissipate heat and thermal expansion coefficient matched to Si for reliability, and low dielectric constant for high signal transmission speed. Densification temperatures were ≤825°C for all composites due to the viscous sintering of the glass matrix. X-ray diffraction proved that AlN neither chemically reacted with other phases nor decomposed with temperature. The number of closed pores increased with the AlN content, which limited the property improvement expected. A dense mullite/glass/AlN (10 wt%) composite had a thermal expansion coefficient of 4.44 ppm/°C between 25 and 300°C, thermal conductivity of 1.76 W/m.K at 25°C, dielectric constant (loss) of 6.42 (0.0017) at 5 MHz, flexural strength of 88 MPa and elastic modulus of 82 GPa, that are comparable to the commercial low temperature co-fired ceramics products.