Carbon Fiber Reinforced Carbon–Al–Cu Composite for Friction Material

Abstract

A carbon/carbon–Al–Cu composite reinforced with carbon fiber 2.5D-polyacrylonitrile-based preforms was fabricated using the pressureless infiltration technique. The Al–Cu alloy liquids were successfully infiltrated into the C/C composites at high temperature and under vacuum. The mechanical and metallographic properties, scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS) of the C/C–Al–Cu composites were analyzed. The results showed that the bending property of the C/C–Al–Cu composites was 189 MPa, whereas that of the pure carbon slide material was only 85 MPa. The compressive strength of C/C–Al–Cu was 213 MPa, whereas that of the pure carbon slide material was only 102 MPa. The resistivity of C/C–Al–Cu was only 1.94 μΩm, which was lower than that of the pure carbon slide material (29.5 μΩm). This finding can be attributed to the “network conduction” structure. Excellent wettability was observed between Al and the carbon matrix at high temperature due to the existence of Al4C3. The friction coefficients of the C/C, C/C–Al–Cu, and pure carbon slide composites were 0.152, 0.175, and 0.121, respectively. The wear rate of the C/C–Al–Cu composites reached a minimum value of 2.56 × 10−7 mm3/Nm. The C/C–Al–Cu composite can be appropriately used as railway current collectors for locomotives.

Structure and Mechanical Properties of Al–Cu/C Composites Produced by Mechanical Alloying and Solid-State Sintering

“…9, б, г). З робіт [46][47][48][49] відомо, що найкращий баланс у співвідношенні «міцність-пластичність» у композитах може бути досягнутий за об'ємної частки карбідів менше 5%. Оцінена кількість карбідної фази у випадку композитів Al-17Cu/5C та Al-33Cu/5C становить -3-5%, що достатньо для суттєвої модифікації структури композиту та поліпшення її механічних властивостей (табл.…”

Phase Transformations during Mechanical Alloying of Powders with Eutectic Composition of Al–Cu and Al–Cu/C Systems and Their Effect on the Structure and Mechanical Properties of the Composites

“…Кроме того в этом случае наблюдается наибольшее отклонение от ПС (3,1 ГПа и 110 ГПа), что может свидетельствовать о наиболее существенной модификации микроструктуры. Из работ [50,51] известно, что наилучший баланс в соотношении «прочность-пластичность» в таких композитах может быть достигнут при концентрации карбида <5% об. Таким образом, оцененное количество карбида в случае Al-33Cu/5C композитов после горячего прессования составляет ∼3-5% об., что достаточно для существенной модификации микроструктуры и улучшения механических свойств композита.…”

Sb/N‐Doped Carbon Nanofiber as a Sodium‐Ion Battery Anode

“…[13,14] The second category is the alloying mechanism. The representative ones are P, [15] Sn, [16,17] Bi, [18] Sb, [19][20][21][22] etc., which have been extensively studied due to their high theoretical capacity. The third category is the conversion mechanism for transition metal oxides [23][24][25][26] and sulfides.…”