Near zero thermal expansion in metal matrix composites based on intermediate valence systems: Al/SmB6

Serebrennikov, D. A.; Быков, А. А.; Trigub, Alexander L.; Kolyshkin, N. A.; Freydman, A. L.; Aborkin, A. V.; Tovpinets, A. O.; Clementyev, E. S.; Goikhman, Alexander

doi:10.1016/j.rinp.2021.103843

Cited by 6 publications

(2 citation statements)

References 39 publications

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“…The experimental CTE for each temperature range are summarized in Table 2. To further understand the impact of hybrid fillers on the thermal expansion properties of the composites, the theoretical CTE is calculated using the rule of mixtures model 59 with Formula ():

α_{theor} = (1 - V_{normalf}) \times α_{normalm} + V_{normalf} \times (X_{1} α_{1} + X_{2} α_{2})

where

\propto_{theor}

is the theoretical CTE of composites (below Tg),

V_{normalf}

is the volume fraction of hybrid filler,

α_{m}

α_{1}

, and

α_{2}

are the CTE of PPO resin matrix, BN and Al 2 O 3 , respectively.

X_{1}

and

X_{2}

are the volume fraction of BN and Al 2 O 3 respectively, within the hybrid filler content.…”

Section: Resultsmentioning

confidence: 99%

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Polyphenylene oxide/boron nitride–alumina hybrid composites with high thermal conductivity, low thermal expansion and ultralow dielectric loss

Xu,

Wang

et al. 2024

Polymer Composites

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Traditional integrated circuit (IC) packaging materials and printed circuit board substrate materials suffer from several limitations including low thermal conductivity, high coefficient of thermal expansion (CTE), and poor dielectric properties. Although significant efforts have been made to enhance these properties, achieving a single composite system with simultaneous high thermal conductivity, extremely low CTE, and dielectric loss remains a formidable task. In this study, we propose a hybrid polymer composite system that addresses these challenges. Our approach involves utilizing a thermosetting polyphenylene oxide (PPO) as the resin matrix, while incorporating boron nitride (BN) sheets with high thermal conductivity and alumina (Al2O3) spheres with favorable fluidity as fillers. To optimize the composite properties, the filler surfaces are modified using dopamine and silane coupling agents, ensuring proper interface control. The composites exhibit significant improvements in thermal conductivity, reduced dielectric loss and CTE, while maintaining excellent processibility. Specifically, with a composition of 25 vol% BN and 25 vol% Al2O3, the thermal conductivity of the composite reaches 2.18 W·m−1 K−1, surpassing neat PPO resin by a factor of 10.9. Simultaneously, the CTE decreases from 2.27% to 1.18% between 50 and 260°C, and the dielectric loss reduces from 0.0024 to 0.0011 at 10 GHz, as compared to neat PPO resin.Highlights The reported novel hybrid composite offers a promising solution to the limitations of traditional IC packaging materials. The reported hybrid composite exhibits significantly improved thermal conductivity, ultralow dielectric loss, and reduced coefficient of thermal expansion, while maintaining excellent processibility. The thermal conductivity of the composites reaches 2.18 W·m−1 K−1, surpassing that of the neat resin by a factor of 10.9, meanwhile the dielectric loss is as low as 0.0011 at 10 GHz, which is extremely difficult to achieve simultaneously for thermosetting polymer composites. Synergetic effects were realized with the hybridization of fillers with different dimensionality, and proper filler surface modification.

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α_{theor} = (1 - V_{normalf}) \times α_{normalm} + V_{normalf} \times (X_{1} α_{1} + X_{2} α_{2})

where

\propto_{theor}

is the theoretical CTE of composites (below Tg),

V_{normalf}

is the volume fraction of hybrid filler,

α_{m}

α_{1}

, and

α_{2}

are the CTE of PPO resin matrix, BN and Al 2 O 3 , respectively.

X_{1}

and

X_{2}

are the volume fraction of BN and Al 2 O 3 respectively, within the hybrid filler content.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental CTE for each temperature range are summarized in Table2. To further understand the impact of hybrid fillers on the thermal expansion properties of the composites, the theoretical CTE is calculated using the rule of mixtures model59 with Formula (3):…”

mentioning

confidence: 99%