Regularities of ion-electron emission of one-dimensional carbon-based composite material

Erosion of carbon fiber composites under high-fluence heavy ion irradiation

“…The analysis of KUP-VM and Desna 4 surface topography using SEM and optical microscopy has shown that, as in the case of 30 keV N þ 2 -KUP-VM [7,8], Ar + irradiation results at relatively low temperatures (T < T a ) to the retention of one-dimensional fiber morphology; although the fibers etching and formation of the trough-like longitudinal cavities and hillocks has been observed, see Fig. 2a and c. Some nanoneedles are created on the cavities edges of the eroded fibers.…”

“…For comparison the samples of polycrystalline graphite MPG-8 were also irradiated. The experimental procedure is described elsewhere [7,8]. Irradiation was produced by 30 keV Ar + ions.…”

“…Investigations of the structure and morphology of the ion-induced surface layer of one-dimensional CFC KUP-VM under high 30 keV N þ 2 ion irradiation showed that irradiation results in a loss of anisotropy of the KUP-VM surface layer structure. This is because of amorphization at room temperature or recrystallization at a temperature higher than a dynamic annealing temperature T a when fiber crimping had been observed [7,8].…”

Physical and mechanical properties of high-modulus carbon fiber crimped by ion irradiation

“…The magnified image on Figure 2 (right) demonstrates the prismatic shape of ion-induced crimps on the surface of the carbon fiber. The prisma-shaped crimps were observed earlier when the KUP-VM composite reinforced with the VMN-4 fibers was irradiated by 30 keV separated N 2 + ion beam at the target temperature of 330 °C [2]. The estimations of the crimps microgeometry showed that the increase in the specific surface area of the Kulon and Ravilon PAN-fibers does not exceed a few times.…”

“…The carbon PAN-fibers are characterized by surface crimping at elevated temperatures T of high-fluence irradiation by ions with energies of tens of keV and the level of radiation damage determined by the number of displacements per atom exceeding a certain threshold level. The crimping regularities of PAN-fibers were studied by irradiating of KUP-VM and Desna CCCM samples reinforced with PAN-fibers of VMN-4 and UKN 5000 grades, respectively [2][3][4].…”