Near‐Net‐Shaping of Ultra‐High Temperature Ceramics

Tallón, Carolina; Franks, George V.

doi:10.1002/9781118700853.ch5

Cited by 6 publications

(3 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, while static charge produced by friction may initially lead to electrostatic repulsion in air, this dissipates with time and is significantly reduced by humidity. In wet systems there are a variety of mechanisms that can be used to produce repulsion, which overwhelms the van der Waals attraction as shown in Figure .…”

Section: Controlling Interactions Between Particlesmentioning

confidence: 99%

“…At low pH the surface becomes positively charged while at high pH the surface is negatively charged. The pH at which the surface is neutral is called the IEP and depends on the particular material . When highly charged surfaces of similar sign interact in aqueous solution, the surfaces are repelled from each other.…”

Section: Controlling Interactions Between Particlesmentioning

confidence: 99%

“…The pH at which the surface is neutral is called the IEP and depends on the particular material. 48,[106][107][108] When highly charged surfaces of similar sign interact in aqueous solution, the surfaces are repelled from each other. The counterions in solution that keep the entire system electrically neutral, become concentrated in the gap between particles.…”

Section: Between Particlesmentioning

confidence: 99%

See 2 more Smart Citations

Colloidal processing: enabling complex shaped ceramics with unique multiscale structures

et al. 2017

Self Cite

View full text Add to dashboard Cite

Colloidal processing of fine ceramic powders enables the production of complex shaped ceramics with unique micro and macro structures which are not possible to produce via conventional dry processing routes. Because of this enhanced structural control and shaping capabilities, colloidal processing has been exploited to produce ceramic components with ever increasing complexity and functionalities. In this review, we revisit some of the research efforts on this topic to highlight its relevance and growing importance for the advanced manufacturing of functional ceramics. Selected examples of colloidal systems with increasing level of complexity are discussed to showcase the wide range of structures that can be generated through wet processing approaches. The historical development and background knowledge pertaining to colloids and surface interactions is first briefly reviewed. The major colloidal shape forming and additive manufacturing processes that utilize colloidal pastes and inks are then reviewed, highlighting the control of suspension rheology needed in these techniques. Next, methodologies that combine suspended particles with a pore‐forming phase are discussed as a means to produce porous ceramic materials. Further control over the interactions between anisotropic particles and their alignment in suspensions can be gained via externally applied fields (such as magnetic) to produce texturally aligned green bodies. This leads to bioinspired ceramics that can programmably morph into complex shaped objects upon sintering. Hierarchical porous structures with high mechanical efficiency are also shown as an example of the multiscale designs that can be generated through advanced colloidal processing. As drying of ceramic bodies is an inevitable consequence of wet colloidal processing, the current understanding of this critical processing step is reviewed. Finally, the gaps in knowledge in these fields are discussed to provide our perspective on where the field may support advances in ceramics in the future.

show abstract

Section: Controlling Interactions Between Particlesmentioning

confidence: 99%

Section: Controlling Interactions Between Particlesmentioning

confidence: 99%

Section: Between Particlesmentioning

confidence: 99%

See 1 more Smart Citation

Colloidal processing: enabling complex shaped ceramics with unique multiscale structures

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

Modification of aqueous graphite suspensions for use in gelcasting

Nabii

Zadeh

Javadpour

et al. 2020

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

Advances in ultra-high temperature ceramics, composites, and coatings

et al. 2021

View full text Add to dashboard Cite

Ultra-high temperature ceramics (UHTCs) are generally referred to the carbides, nitrides, and borides of the transition metals, with the Group IVB compounds (Zr & Hf) and TaC as the main focus. The UHTCs are endowed with ultra-high melting points, excellent mechanical properties, and ablation resistance at elevated temperatures. These unique combinations of properties make them promising materials for extremely environmental structural applications in rocket and hypersonic vehicles, particularly nozzles, leading edges, and engine components, etc. In addition to bulk UHTCs, UHTC coatings and fiber reinforced UHTC composites are extensively developed and applied to avoid the intrinsic brittleness and poor thermal shock resistance of bulk ceramics. Recently, highentropy UHTCs are developed rapidly and attract a lot of attention as an emerging direction for ultra-high temperature materials. This review presents the state of the art of processing approaches, microstructure design and properties of UHTCs from bulk materials to composites and coatings, as well as the future directions.

show abstract

Near‐Net‐Shaping of Ultra‐High Temperature Ceramics

Cited by 6 publications

References 73 publications

Colloidal processing: enabling complex shaped ceramics with unique multiscale structures

Colloidal processing: enabling complex shaped ceramics with unique multiscale structures

Modification of aqueous graphite suspensions for use in gelcasting

Advances in ultra-high temperature ceramics, composites, and coatings

Contact Info

Product

Resources

About