Aljaž Iveković (Avtor), Gokula Krishna Muralidharan (Avtor), Andrei Galatanu (Avtor), Guichuan Li (Avtor), Kim Vanmeensel (Avtor), Jef Vleugels (Avtor)

Povzetek

Tungsten-copper (W-Cu) composites have a wide range of engineering applications, from arc-resistant electrodes and high-voltage electrical contacts to heat sinks for integrated circuits and plasma-facing components for fusion reactors. They combine high corrosion and erosion resistance, very good thermal and electrical conductivity, low thermal expansion, with good mechanical properties. However, the fabrication of such materials is limited in terms of shape complexity and the internal distribution of the individual phases. Furthermore, the dissimilar thermo-mechanical properties (melting temperature, thermal conductivity, coefficient of thermal expansion) of the constituent phases impose severe constraints on the fabrication and use of W-Cu composites. To overcome the challenges of component design and enable greater freedom in terms of composition, W-Cu composites were produced by a combination of additive manufacturing and liquid-melt infiltration (LMI). Porous W-lattice structures were manufactured by laser powder-bed fusion (LPBF) followed by infiltration with molten Cu. A series of composites was produced with Cu contents from 3 to 75 vol% and evaluated in terms of thermal, electrical, and mechanical properties. The LPBF-LMI W-Cu composites exhibited comparable thermo-mechanical properties to W-Cu materials manufactured using powder-metallurgical processing, but with an expanded composition range and shape complexity. Lower thermal expansion coefficients (4.5–5.8 × 10−6 K−1) and an improved thermal stability of the Young’s modulus, only a 27–33 GPa decline in the range 27–827 °C, were observed for all the compositions, which was ascribed to the W-phase connectivity in all the W-Cu composites, independent of the volume fraction of Cu.

Ključne besede

termomehanske lastnosti;termomechanical properties;liquid-metal infiltration;laser powder-bed fusion;metal-matrix composites;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: IJS - Institut Jožef Stefan
UDK: 621.7+621.9
COBISS: 225480451 Povezava se bo odprla v novem oknu
ISSN: 1873-4669
Št. ogledov: 27
Št. prenosov: 6
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarne ključne besede: Kompoziti;Volfram;Baker;
Konec prepovedi (OpenAIRE): 2026-12-31
Komentar vira: Nasl. z nasl. zaslona; Opis vira z dne 7. 2. 2025;
Strani: str. 1-11
Zvezek: ǂVol. ǂ1011, [article no.] 178411
Čas izdaje: Jan. 2025
DOI: 10.1016/j.jallcom.2024.178411
ID: 25859554