A Liberal Takes on the Progressives

Carbon fabric/phenolic composites modified with potassium titanate whisker (PTW) were prepared by a dip-coating and hot-press molding technique, and the tribological properties of the resulting composites were investigated systematically using a ring-on-block arrangement under different sliding conditions. Experimental results showed that the optimal PTW significantly decreased the wear-rate. The worn surfaces of the composites and the transfer film formed on the counterpart steel ring were examined by scanning electron microscopy (SEM) to reveal the wear mechanisms. The transfer films formed on the counterpart surfaces made contributions to the improvement of the tribological behavior of the carbon fabric composites. The friction and wear of the filled carbon fabric composites was significantly dependent on the sliding conditions. It is observed that the wear-rate increased with increasing applied load and sliding speeds.

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Remarkable plasma-resistance performance by nanocrystalline Y2O3·MgO composite ceramics for semiconductor industry applications

Scientific Reports ◽

10.1038/s41598-021-89664-9 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Hyeon-Myeong Oh ◽

Young-Jo Park ◽

Ha-Neul Kim ◽

Kundan Kumar ◽

Jae-Woong Ko ◽

...

Keyword(s):

Plasma Etching ◽

Semiconductor Industry ◽

High Plasma ◽

Hot Press ◽

Composite Ceramics ◽

Plasma Resistance ◽

Industry Applications ◽

Hot Press Sintering ◽

Resistance Performance ◽

First Time

AbstractMotivated by recent finding of crystallographic-orientation-dependent etching behavior of sintered ceramics, the plasma resistance of nanocrystalline Y2O3-MgO composite ceramics (YM) was evaluated for the first time. We report a remarkably high plasma etching resistance of nanostructure YM surpassing the plasma resistance of commercially used transparent Y2O3 and MgAl2O4 ceramics. The pore-free YM ceramic with grain sizes of several hundred nm was fabricated by hot press sintering, enabling theoretical maximum densification at low temperature. The insoluble two components effectively suppressed the grain growth by mutual pinning. The engineering implication of the developed YM nanocomposite imparts enhanced mechanical reliability, better cost effectiveness with excellent plasma resistance property over their counterparts in plasma using semiconductor applications.

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Preparation and Properties of Electrospun Polyimide Ultrafine Fibrous Mats with Excellent Heat-fusibility via Hot-press procedure from Organo-soluble Polyimides Containing Phenolphthalein Units

Fibers and Polymers ◽

10.1007/s12221-021-0091-1 ◽

2021 ◽

Author(s):

Hao-ran Qi ◽

Yan Zhang ◽

Xin-xin Zhi ◽

Lin Qi ◽

Hao Wu ◽

...

Keyword(s):

Hot Press

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The ultrahigh discharge efficiency and energy density of P(VDF-HFP) via electrospinning-hot press with St-MMA copolymer

Materials Chemistry Frontiers ◽

10.1039/d1qm00105a ◽

2021 ◽

Author(s):

Jian Wang ◽

Yunchuan Xie ◽

Yifei Zhang ◽

Biyun Peng ◽

Qizheng Li ◽

...

Keyword(s):

Energy Density ◽

Phase Field ◽

Composite Films ◽

Experimental Tests ◽

Hot Press ◽

Phase Field Simulation ◽

Field Simulation ◽

Discharge Efficiency

Flory–Huggins theory combined with experimental tests and phase-field simulation proves that electrospinning improves the homogeneity and Eb in composite films, and MS can limit the ferroelectric relaxation of PVDF and significantly increase Ue and η.

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Effect of W on the Impact-Induced Energy Release Behavior of Al–Ni Energetic Structural Materials

Metals ◽

10.3390/met11081217 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1217

Author(s):

Shun Li ◽

Caimin Huang ◽

Jin Chen ◽

Yu Tang ◽

Shuxin Bai

Keyword(s):

Energy Release ◽

Structural Materials ◽

Damage Effect ◽

Hot Press ◽

Reaction Heat ◽

Metal Metal ◽

Energetic Structural Materials ◽

Released Energy ◽

The Impact ◽

Hot Press Process

Energetic structural materials (ESMs) are an important class of military materials due to their good structural and energy-releasing characteristics. To improve the damage effect of metal–metal ESMs with good mechanical properties, W was added to the 48Al–52Ni composites, and the effect of W on the impact-induced energy release behaviors was investigated. The results showed that the hot-press process and the addition of W did not change the microstructure and surface state of the constituent particles, leading to a stable onset temperature of the Al–Ni intermetallic reaction in (48Al–52Ni)100-xWx composites. Meanwhile, the decrease in the contact area between Al and Ni in the composites with increased W content resulted in the decrease in reaction heat. During the impact process, the intermetallic reaction of W caused by the Al–Ni intermetallic reaction, as well as the oxidation reaction of Al and Ni caused by the brittle fracture along the weak interface, caused the released energy of (48Al–52Ni)40W60 to reach 2.04 kJ/g.

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