Evolution of the interlayer microstructure and the fracture modes of the zirconia/Cu–Ag–Ti filler/Ti active brazing joints

Smorygo, Oleg; Kim, J.S.; Kim, M.D.; Eom, Tae Gwan

doi:10.1016/j.matlet.2006.05.024

Cited by 53 publications

(54 citation statements)

References 9 publications

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“…According to these data, it is believed that residual stresses can be accommodate by plastic flow from the large ductility of these fillers during cooling from the brazing temperature [4,8,15]. Fig.…”

Section: Microhardness Measurementsmentioning

confidence: 96%

“…8b exhibits a continuous dark reaction layer in both ceramic/filler interfaces which is basically composed by Ti-O compounds (TiO, Ti 2 O 3 , Ti 3 O 5 …TiO 2 ) from superficial reduction of zirconium oxide. It is beneficial to improve wetting and spreading on the ceramic substrate by the melted filler alloy and precipitation of active metal oxide [3,4,8,15].…”

Section: Microhardness Measurementsmentioning

confidence: 99%

“…These solutes promote lower contact angles and enhance the ceramic/metal wettability by the melted filler alloy reducing the oxide that constitutes the main ceramic phase. Formation of a continuous interfacial reaction layer between the ceramic and filler is crucial for joint strength [6][7][8]. However, excessive reduction reactions can produce a reaction layer with undesirable intermetallic phases decreasing mechanical properties of the brazing joint.…”

Section: Introductionmentioning

confidence: 99%

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Joining of zirconia mechanically metallized with titanium

et al. 2010

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Direct brazing is a well-known technique for joining ceramics either themselves or to metals, whereby the required costly active filler alloys are considered a handicap of this process. In this work the indirect brazing of zirconia to zirconia mechanically metallized with Ti was successfully achieved using conventional filler alloys. The mechanical metallization specially applied to oxide ceramics is a successfully technique that was patented by Forschungszentrum Juelich, Germany, and it has been the subject of applied researches in the last 10 years. This particular metallization is made at room temperature with low cost production and is environmentally safe. Partially stabilized zirconia with yttria was mechanically metallized with Ti and wetting conditions were evaluated using Ag-28Cu and Au-18Ni fillers. These conventional fillers dissolve part of the Ti-coating becoming on-site at brazing temperature an active filler alloy which reacts with the zirconium oxide to improve wetting on the ceramic surface. Better results were selected for brazing tests in a high-vacuum furnace (< 3×10 -5 mbar). Helium gas leak detection was made at the ceramic/ ceramic interface at room temperature; samples from reliable vacuum tight joints were examined by microestructural analysis and linescan technique by energy dispersive X-ray analysis in its cross-section. Microhardness profiles were made across the joint interface where zirconia undergone darkening after brazing process. Sound brazed joints were produced even when just one ceramic surface of the joint assemble was previously metallized, due to titanium diffusion from the metallized ceramic surface to the other ceramic side at the joint assemble. Keywords: mechanical metallization, zirconia, Ti-coating, brazing. Resumo A brasagem direta é uma técnica bem conhecida para união de cerâmicas entre si bem como aos metais, segundo a qual as ligas de adição requeridas são consideradas uma relativa desvantagem devido ao aumento nos custos do processo. Neste trabalho, a brasagem indireta da zircônia à zircônia mecanicamente metalizada com Ti foi alcançada com sucesso, usando-se ligas de adição convencionais. A metalização mecânica especialmente aplicada aos óxidos cerâmicos é uma técnica bem

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Section: Microhardness Measurementsmentioning

confidence: 96%

Section: Microhardness Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Joining of zirconia mechanically metallized with titanium

et al. 2010

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“…Pure silver and silver based alloys have been reported to braze titanium to steel with good results [8,9] and to ceramicglass [10]. Silver nanoparticle paste has been successfully used in bonding micrometric copper wires of 50 micron diameter [11,12] and research work has been done to understand the interfacial bonding mechanisms of these nanoparticle pastes to bulk materials [13,14].…”

Section: Introductionmentioning

confidence: 99%

Fracture analysis of Ag nanobrazing of NiTi to Ti alloy

Quintino¹,

Ping

et al. 2013

Soldag. insp.

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“…Moreover, zirconia exhibits higher strength and fracture toughness than alumina particularly at temperatures below ≈300ºC for K IC values in the range 15-20 MPa.m 1/2 (Hanson et al, 2000). These properties are beneficial in many technical applications from wire drawing dies, cutting and machining tools, gas turbines to oxygen sensors and solid oxide fuel cells, including those that require the ceramic to be bounded to a metallic member (Sciti et al, 2001;Smorygo et al, 2007).…”

Section: Introductionmentioning

confidence: 99%