Journal
COMPOSITES PART B-ENGINEERING
Volume 211, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.108678
Keywords
Near-zero thermal expansion; Metal matrix composites; Interpenetrating microstructure; Residual stress
Funding
- National Natural Science Foundation of China [51771063, 52071117]
- China Postdoctoral Science Foundation [2019T120263, 2018M631926]
- Heilongjiang Province Postdoctoral Science Foundation [LBH-Z18079]
- Heilongjiang Province Science Foundation [LH2020E030]
- Heilongjiang Touyan Team
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The study developed a near-zero thermal expansion ZrW2O8/Al-Si composite with three-dimensional structure, achieved through pressure infiltration for dense structure and mild interface reaction. The resulting composite has ultra-low thermal expansion, making it ideal for precision instruments and microelectronics components.
Negative thermal expansion (NTE) materials can compensate high thermal expansion of metal materials, showing great potential use in precision instruments and microelectronics field. We developed a near-zero thermal expansion ZrW2O8/Al-Si composites with three dimensional mutually interpenetrated structure. Pressure infiltration ensured dense structure and mild interface reaction. The resulting composite has ultra-low thermal expansion (1.09 x 10(-6) K-1) in a broad temperature range of 50 to 120 degrees C (Delta T = 170 degrees C). The content of high pressure phase (gamma-ZrW2O8) drops dramatically from 71.4% for the particle reinforced composite to 18.7% for the interpenetrating composite. Raman tests and numerical computational results indicated that the residual stress can be effectively released in the interpenetrating composites. This low dense and ultralow thermal expansion results in ideal materials for precision instruments and microelectronics component such as optical communication and gyroscope.
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