Effective Surface Recession Laws for the Physico-Chemical Ablation of C/C Composite Materials

2010 ◽  
pp. 351-360 ◽  
Author(s):  
G. L. Vignoles ◽  
J. Lachaud ◽  
Y. Aspa ◽  
M. Quintard
Keyword(s):  
Composite Materials ◽  
Effective Surface ◽  
Physico Chemical ◽  
Chemical Ablation

scholarly journals The Use of Composite Materials in 3D Printing

2020 ◽  
Vol 4 (2) ◽  
pp. 42 ◽  
Author(s):  
Ignazio Blanco
Keyword(s):  
Composite Materials ◽  
3D Printing ◽  
Rapid Prototyping ◽  
Polymer Matrix ◽  
Chemical Properties ◽  
Modified Polymer ◽  
Research Activities ◽  
Physico Chemical ◽  
3D Printed ◽  
Limited Spectrum

Nowadays, all production, from the smallest ones to large companies, and research activities are affected by the use of 3D printing technology. The major limitation, in order to cover as many fields of application as possible, is represented by the set of 3D printable materials and their limited spectrum of physico-chemical properties. To expand this spectrum and employ the 3D-printed objects in areas such as biomedical, mechanical, electronical and so on, the introduction of fibers or particles in a polymer matrix has been widely studied and applied. In this review, all those studies that proposed modified polymer presenting advantages associated with rapid prototyping are reported.

scholarly journals Wet-chemical method for the metallization of a para-aramid filament yarn wound on a cylindrical dyeing package

2016 ◽  
Vol 87 (10) ◽  
pp. 1192-1202 ◽  
Author(s):  
Toty Onggar ◽  
Gosbert Amrhein ◽  
Anwar Abdkader ◽  
Rolf-Dieter Hund ◽  
Chokri Cherif
Keyword(s):  
Composite Materials ◽  
High Performance ◽  
Glass Fibers ◽  
Chemical Properties ◽  
Filament Yarn ◽  
Silver Layer ◽  
Physico Chemical ◽  
Before And After ◽  
Physical Examinations ◽  
Wet Chemical

High-performance yarns such as aramid fibers are nowadays used to reinforce composite materials due to their advantageous physico-chemical properties and their low weight. They are also resistant to heat and fire. Para-aramid filament yarns (p-AFs) wound on a cylindrical dyeing package have been silvered successfully by means of a newly developed wet-chemical filament yarn metallization process on a laboratory scale. The surface morphology of untreated and silvered p-AF was determined by means of scanning electron microscopy. The chemical structure of the surfaces (contents of carbon, oxygen, nitrogen and silver) was determined by means of energy-dispersive X-ray spectroscopy (EDX). The eliminated and newly formed groups of p-AF before and after silvering were detected by infrared spectroscopy (Fourier transform—attenuated total reflectance). After metallization, the silver layer thickness, the mass-related silver content and washing and rubbing fastness were assessed. Furthermore, textile-physical examinations concerning Young's modulus, elongation at break and electrical conductivity were performed. Subsequently, the electrically conductive p-AFs were integrated in thermoset composite materials reinforced by glass fibers and para-aramid.

Features of the influence of space factors on the changes in the optical properties of thermoregulating coatings of the «solar reflector» class

2018 ◽  
Vol 15 (1) ◽  
pp. 56-71
Author(s):  
A. M. Shamayev ◽  
M. D. Ozersky
Keyword(s):  
Optical Properties ◽  
Composite Materials ◽  
Functional Properties ◽  
Chemical Processes ◽  
Space Environment ◽  
Color Centers ◽  
Space Vehicles ◽  
Electrostatic Discharges ◽  
Physico Chemical ◽  
Radiation Resistant

This article analyzes the main problems associated with the estimation of the effect of space factors on the change in the optical properties of thermoregulating coatings (TRP) of the class «solar reflector» used on modern space vehicles. It is shown that the degradation of the functional properties of TRP based on filled polymer composite materials and radiation-resistant glass K-208 under the action of space factors is caused by the formation of color centers both in the filler and in the organic binder, as well as the appearance in the glass of radiation- stimulated defects as a result of electrostatic discharges under the influence of PCF. Analysis of the results of studies of numerous works of scientists from different countries showed that at present there are no content models describing the changes in TRP properties in the space environment, taking into account the basic physico-chemical processes that determine the degradation of TRP.

scholarly journals Novel Polymer Composites on the Basis of Arylalicyclic Polyimide Blends. I. Polyimide/Polycarbonate & Polyimide/Polysulphone Blends

2016 ◽  
Vol 6 (1) ◽  
pp. 7 ◽  
Author(s):  
Saule Kudaikulova ◽  
Zulfiya Musapirova ◽  
Natalya Sobarina ◽  
Maira Umerzakova ◽  
Rinat Iskakov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Mechanical Mixing ◽  
Thermally Stable Polymers ◽  
Blend Films ◽  
Ideal Candidate ◽  
Physical Chemical ◽  
Physico Chemical ◽  
Mechanical Performances ◽  
Chemical Mixing

The new composite materials based on dianhydride of tricyclodecentetracarbon acid and oxydianiline with two other thermally stable polymers, such as polycarbonate and polysulphone, are being reported. The synthesis of the polyimide blends was done through two ways: mechanical mixing of two homopolymer  ingredients; and the so-called chemical mixing of polyimide comonomers with the above-mentioned polymers. The physico-chemical and physico-mechanical properties have been manifested in a broadening of their performance characteristics. It was not found any physical-chemical interactions between the two ingredients of the blend, which indicates the formation of a typical compatible polymer blend with an appropriate miscibility. Such new polyimide composite could be an ideal candidate for the preparation of reflective and conductive metallized polyimide blend films with wide mechanical performances.

scholarly journals PbO2 Based Composite Materials Deposited from Suspension Electrolytes : Electrosynthesis, Physico-Chemical and Electrochemical Properties

2012 ◽  
Vol 6 (2) ◽  
pp. 123-133 ◽  
Author(s):  
Alexander Velichenko ◽  
◽  
Valentina Knysh ◽  
Tatiana Luk’yanenko ◽  
Larisa Dmitrikova ◽  
...  
Keyword(s):  
Composite Materials ◽  
Electrochemical Properties ◽  
Physico Chemical
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