Bonding Structure of Zirconium Diboride Joined with Filler Alloys Bearing Active Metals

Sakurai, Takeo; Minegishi, Tomoya; Morozümi, Shotaro; Hamajima, K.

doi:10.2320/jinstmet1952.54.7_832

Cited by 7 publications

(4 citation statements)

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“…(5) Mechanism for Joining ZrB 2 -SiC Composites Using B-Rich Filler Layer and SPJ Previous studies on joining ZrB 2 -based ceramics focused on using a complete or partial melting of the filler layer to react or diffuse into the substrates which may result in large unfavorable reaction zones. [18][19][20][21][22][23][24][25] To investigate whether any liquid formation occurred using our Zr-B powder filler layer, the displacement measured during SPJ was monitored (Fig. 8).…”

Section: (4) Oxidation Behavior Of Zrb 2 -Sic Joined With B-rich Fillmentioning

confidence: 99%

“…Research on the joining of ZrB 2 -SiC is limited to the recent efforts of several groups that focus on using metal [18][19][20][21][22][23][24][25] or glass 26,27 fillers to join ZrB 2 -SiC substrates to themselves or to metals using hot pressing. The compositions of the fillers varies widely, including elemental metals, 18,19 metal alloys, [20][21][22][23][24][25] and metallic oxide glasses. 26,27 All the filler's compositions are significantly different from the ZrB 2 -SiC substrates and produced large reaction zones and inhomogeneous microstructures across the joint which can limit the strength of the joined substrates to the strength of the joint.…”

Section: Introductionmentioning

confidence: 99%

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Spark Plasma Joining of ZrB₂–SiC Composites Using Zirconium–Boron Reactive Filler Layers

et al. 2011

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Spark plasma joining is used to join ZrB2–SiC composites with seamless microstructures at the joint that results in retention of high‐temperature mechanical and oxidation properties after joining. Our approach uses a spark plasma sintering furnace and Zr–B powder filler layers to join the parts together. The joining processing parameters used to optimize the joint microstructure were filler composition, target temperature, hold time, and volume of filler. A filler of 1 mm3 and spark plasma joining conditions at 1800°C for 300 s resulted in the formation of a joint region that was indistinguishable from the bulk substrates. Room and high‐temperature (1350°C) shear strengths of joined substrates measured equal to baseline substrates and oxidation behavior for joined and baseline substrates were equivalent after static air oxidation at 1700°C. X‐Ray diffraction measurements show the joint is composed of ZrB2 and ZrC. We found the joining mechanism to be solid‐state bonding of ZrB2 that formed from the Zr–B filler and reaction bonding by the formation of ZrC. Spark plasma joining rapidly joins ZrB2–SiC and probably other conductive ultra high‐temperature ceramic composites, and has the potential to impact the rapid assembly and joining of complex thermal protection material systems.

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Section: (4) Oxidation Behavior Of Zrb 2 -Sic Joined With B-rich Fillmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spark Plasma Joining of ZrB₂–SiC Composites Using Zirconium–Boron Reactive Filler Layers

et al. 2011

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“…There are few investigations for the case of the filler metal containing other elements such as Zr and V. 6)10) The active element in the filler metal plays an important role in the bonding. Thus, it is necessary to know a lot of information about the reaction behavior between the ceramics and the metallic elements.…”

Section: )5)mentioning

confidence: 99%

Interfacial Microstructures and Bonding Strength between Aluminum Nitride and Silver Brazing Filler Metals Containing Various Active Elements

Morizono

Nishida²,

Chiba³

et al. 2004

J. Ceram. Soc. Japan

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Effect of active element on interfacial microstructures and bonding strength of brazed AlN/AlN joints has been investigated and compared with the case of brazed Si 3 N 4 /Si 3 N 4 joints. Brazing was carried out at 1173 to 1473 K for 3.6 ks in a vacuum using AgCu filler metals containing Ti, Zr, V and Nb as an active element. The obtained joint had no defects such as unbonded areas, regardless of active element and bonding temperature. Four kinds of active elements were divided into two groups by shear tests and microstructural observations. One was Ti and Zr, and the other was V and Nb. The bonding strength of the former was higher than that of the latter. In par ticular, the joint with Ti addition showed an excellent strength of about 200 MPa. Main fracture position in the joints with Ti and Zr additions was within the AlN, while most joints with V and Nb additions broke at the inter face between the active filler metal and the AlN. In the former, TiN and ZrN layers consisting of fine grains were observed adjacent to the AlN. On the other hand, the joint with Nb addition had roundish grains of Nb 2 N in similar locations. It was considered that the existence of fine grains contributed to the enhancement of bonding strength due to the increase of contact area and to the formation of complicated interface. These tendencies were essentially consistent with those of the

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“…[5]. The literature data related to joining on this system are scarce [6]. The analysis of experimental data concerning wetting of ZrB 2 by different molten metals, such as Cu, Al, Ga, In, Ge, Sn, Ag, Fe, Ni and Co showed mainly non wetting behavior with contact angle variations from 103 to 135° [1,2,7].…”

Section: Introductionmentioning

confidence: 99%

Surface Properties of Ag-Cu-Zr Liquid Alloys in Relation to the Wettability of Boride Ceramics

Novaković¹,

Muolo²,

Ricci³

et al. 2006

MSF

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The wetting phenomena and adhesion between Ag-Cu-Zr molten alloys (where Zr is an active brazing element) and ZrB2-ceramic substrate have been investigated from theoretical and experimental point of view. The wetting phenomena of molten alloy/ceramic substrate depend on the bonding characteristics of liquid alloys and ceramics as well as the magnitude of interactive forces at the interface. Accordingly, the first step of this investigation is to determine the surface properties of Ag-Cu, Ag-Zr and Cu-Zr liquid alloys. The energetics of the bulk and the surface of liquid alloys have been analysed in the framework of statistical mechanical theory in conjunction with Quasi-Lattice Theory (QLT), through the study of the concentration dependence of various properties such as surface tension, surface composition, concentration fluctuations in the long wavelength limit and Warren-Cowley chemical short-range order parameter. Combining the Young and the Dupré equations, the obtained values of surface tension together with contact angle data have been used to calculate the work of adhesion.

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Bonding Structure of Zirconium Diboride Joined with Filler Alloys Bearing Active Metals

Cited by 7 publications

References 0 publications

Spark Plasma Joining of ZrB₂–SiC Composites Using Zirconium–Boron Reactive Filler Layers

Spark Plasma Joining of ZrB₂–SiC Composites Using Zirconium–Boron Reactive Filler Layers

Interfacial Microstructures and Bonding Strength between Aluminum Nitride and Silver Brazing Filler Metals Containing Various Active Elements

Surface Properties of Ag-Cu-Zr Liquid Alloys in Relation to the Wettability of Boride Ceramics

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Bonding Structure of Zirconium Diboride Joined with Filler Alloys Bearing Active Metals

Cited by 7 publications

References 0 publications

Spark Plasma Joining of ZrB2–SiC Composites Using Zirconium–Boron Reactive Filler Layers

Spark Plasma Joining of ZrB2–SiC Composites Using Zirconium–Boron Reactive Filler Layers

Interfacial Microstructures and Bonding Strength between Aluminum Nitride and Silver Brazing Filler Metals Containing Various Active Elements

Surface Properties of Ag-Cu-Zr Liquid Alloys in Relation to the Wettability of Boride Ceramics

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About

Spark Plasma Joining of ZrB₂–SiC Composites Using Zirconium–Boron Reactive Filler Layers

Spark Plasma Joining of ZrB₂–SiC Composites Using Zirconium–Boron Reactive Filler Layers