Joining ceramics before firing by solvent welding

Rashid, H.; Lindsey, K.; Evans, Julian

doi:10.1016/0955-2219(91)90034-w

Cited by 20 publications

(3 citation statements)

References 16 publications

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“…Secondly, alumina suspension was used to wet the surfaces and the four structures were welded together through alignment of the square border. This is an approach to joining used in the traditional tableware industry to join handles to cups and has been applied to technical ceramics (Rashid et al 1991). Thirdly, after drying, the stack of four 16layer lattices was pyrolysed to 400 • C for 1 hr at a heating rate of 2 • C min −1 from room temperature and sintered at 1540 • C for 1 hr at a heating rate of 5 • C min −1 from 400 • C. Paste flow cannot stop during extrusion so that unwanted filaments linking each pair of parallel filaments are introduced at the border of the square surface and were trimmed by vacuum filling the interstices of the structure with wax and using a diamond cut-off wheel (Struers Ltd., UK).…”

Section: Fabrication Processmentioning

confidence: 99%

Fabrication and evaluation of solid freeformed electromagnetic bandgap structures

Lu¹,

Lee²,

Yang³

et al. 2009

J. Phys. D: Appl. Phys.

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Microwave electromagnetic bandgap (EBG) structures have potential applications in improving the radiating features of antennas and the transmission properties of waveguides. Extrusion freeforming is a rapid prototyping technique for assembling ceramic dielectric lattice structures directly from a computer design file. It is without heating, cooling or polymerization processes to contend with at the construction stage. Various limitations on overall build thickness prompted us to explore lamination by welding to produce larger three-dimensional quasi-crystals. Microwave transmission through normal and side incidence showed that the bandgap frequency was in the 90–110 GHz region in all directions, matching the design that was informed by computer modelling. In order to image the EBG internal crystal structure, micro-computed tomography was used for scanning and reconstruction. Finally, the effect of structural defects including roundness and sagging of filaments and deviation of inter-filament spacing caused by fabrication errors on bandgap frequency was investigated.

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Section: Fabrication Processmentioning

confidence: 99%

Fabrication and evaluation of solid freeformed electromagnetic bandgap structures

Lu¹,

Lee²,

Yang³

et al. 2009

J. Phys. D: Appl. Phys.

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“…Advanced ceramics, such as SiC, do not exhibit plasticity, and, hence, the green state joining of SiC has been overlooked as a method of fabricating complex shapes. However, research on solvent welding 10 of ceramics shows that, by dispersing powders in a carrier medium, the unique behavior of claybased ceramics can be approximated. The work of Foley et al 11 on joining Si 3 N 4 and SiC by the slip/cold isostatically pressing (CIPing) method has indicated that green state joining is potentially a viable method.…”

Section: Introductionmentioning

confidence: 99%

Green State Joining of Silicon Carbide Using Polycarbosilane

Zheng

Ünal

Akinç

2000

Journal of the American Ceramic Society

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Green state joining of SiC was investigated using a paste consisting of polycarbosilane polymer and SiC powder. The joining process and densification were described. Initial experiments resulted in the formation of symmetrical black bands and cracks on both sides of the joint. However, with modifications in processing conditions, the cracks were eliminated and the resulting joints were indistinguishable from the matrix. The flexural strength of joined samples was measured to be 234 MPa, which was comparable to that of the control sample with similar density. As the applied pressure during joining was increased from 34 to 138 MPa, the strength of the joined samples increased from 180 to 250 MPa.

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“…In practice, the situation is not so simple, as witnessed by the reduced interfacial contact and cracking sometimes seen in joined systems [10][11][12]. The organic vehicle can then be removed from the whole and the assembly sintered.…”

Section: Introductionmentioning

confidence: 99%

Cross-flow ceramic structures produced by plastic processing

Payne

Evans

1998

Int J Adv Manuf Technol

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This paper reports part of an attempt to harness the scope and versatility of polymer manufacturing operations and use them in ceramics processing. It describes the preparation of extruded zirconia ridged plates, the film-blowing of zirconia and the solvent welding of stacks of these components to produce cross-flow structures. Assemblies of this type, prepared from a single ceramic, find application in heat exchangers. Assemblies of composite ceramics, when the problems of cofiring of different powders are overcome, provide solid oxide fuel cell structures. The organic vehicle used for these processes was based on polystyrene. The structures were sintered and then examined for the defects which are characteristic of these plastic-forming operations when applied to ceramics.

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Joining ceramics before firing by solvent welding

Cited by 20 publications

References 16 publications

Fabrication and evaluation of solid freeformed electromagnetic bandgap structures

Fabrication and evaluation of solid freeformed electromagnetic bandgap structures

Green State Joining of Silicon Carbide Using Polycarbosilane

Cross-flow ceramic structures produced by plastic processing

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