Mechanical and microstructural properties of cordierite-bonded porous SiC ceramics processed by infiltration technique using various pore formers

Baitalik, Sanchita; Dalui, Srikanta; Kayal, Nijhuma

doi:10.1007/s10853-018-2007-z

Cited by 21 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They were formed due to the removal of organic matter from the green bodies, in particular of the pore‐forming added to improve the porosity of the 3D printed ceramics. The added pore formers enable sintering at a higher temperature as well as producing a larger porosity 38 . It is well known that when raising the sintering temperature, the densification of a ceramic material is increased and the porosity is decreased 39 .…”

Section: Resultsmentioning

confidence: 99%

“…The added pore formers enable sintering at a higher temperature as well as producing a larger porosity. 38 It is well known that when raising the sintering temperature, the densification of a ceramic material is increased and the porosity is decreased. 39 How-ever, the ceramic cores require a porosity greater than 20 vol%, in general, to provide space for the penetration of the alkaline liquid that dissolves them after the casting process.…”

Section: Microstructure and Element Compositionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced 3D printed alumina ceramic cores via impregnation

Colombo

et al. 2021

J Am Ceram Soc

View full text Add to dashboard Cite

3D-printed alumina ceramic cores often face the problem of low flexural strength at its application temperature of 1500°C, and the requirements on porosity and strength limit its fabrication process. In this research, three types of solutions were employed to impregnate the ceramics to improve the strength of the 3Dprinted alumina ceramic cores. The results showed that silica sol (SS), tetraethyl orthosilicate (TO), and 3-(Trimethoxysilyl)propyl methacrylate (PM) all could improve the (room temperature) flexural strength of the 3D printed ceramics effectively compared to the control sample (CS) without impregnation, and the SS solution could improve the high temperature flexural strength at 1500°C greatly compared to other solutions. The improvement in strength was due to the introduction of Si, which formed a stable mullite phase during the sintering process. Computed tomography (CT) analysis showed there is no cracks formed in the ceramic cores impregnated with the SS solution, and they exhibited the overall best performance (21.2 ± 0.8 vol% open porosity, shrinkage of 3.2 ± 0.3% in the X direction, 3.4 ± 0.2% in the Y direction, 2.1 ± 0.4% in the Z direction, room temperature flexural strength of 85.7 ± 6.9 MPa, and 1500°C flexural strength of 19.2 ± 1.1 MPa).

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Microstructure and Element Compositionmentioning

confidence: 99%

Enhanced 3D printed alumina ceramic cores via impregnation

Colombo

et al. 2021

J Am Ceram Soc

View full text Add to dashboard Cite

show abstract

“…A great deal of effort has been devoted to the fabrication of highly porous SiC-based ceramics using various techniques, such as a polymeric sponge technique [19,30], use of fugitive additives [31], partial hot-pressing [32,33], gel-casting [34][35][36], sintering of hollow spheres as sacrificial templates [37], sol-gel and carbothermal reduction [38,39], pyrolysis and infiltration of natural wood precursors [40,41], freeze-casting and solid-state sintering [42][43][44], a liquid infiltration technique [45][46][47] and direct foaming of ceramic suspensions or preceramic polymers [48][49][50][51][52]. Depending on the processing technique selected, porosity content achieved, pore size distribution, and degree of pore interconnectivity factors which have direct effects on the properties of the porous ceramic are varied.…”

Section: Introductionmentioning

confidence: 99%

Starch consolidation of SiC ceramics: processing and low-temperature sintering in an air atmosphere

Kalemtaş

Topateş²,

Aydın

et al. 2020

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

Highly porous SiC ceramics containing borax decahydrate were produced by a starch consolidation method in which corn starch was used as a shaping and pore-forming additive. Four different compositions were prepared with different SiC:borax decahydrate ratios and corn starch content. Mixtures with a solid ratio of 55 wt.% were cast in non-porous molds and heated at 80°C for shaping. The starch consolidation technique enabled the shaping of SiC ceramics with different forms and sizes. Simultaneous thermogravimetry and differential thermal analysis of the SiC-borax decahydrate mixture showed that melting took place at below 600°C, as a result of which sintering was carried out at the relatively low temperature, of 600°C in the air using borax decahydrate as a sintering additive. Phase analysis showed that oxidation of SiC did not take place, since no cristobalite phase was detected. Density measurement and mercury porosimetry studies showed that highly porous (70-89% porosity) SiC ceramics with pore size values ranging from 14 to 18 μm were produced. SEM microstructures of each composition revealed that a strong neck had been formed between the SiC particles in spite of the low sintering temperature.

show abstract

“…For each DPF design and material selection, mechanical testing is typically performed to determine the stresses and strains the filter can withstand, which serve as an indicator of its expected life on a vehicle. The most common mechanical test for this type of life assessment is flexure, as it is relatively straightforward to implement and subjects the outer walls of the filter to tension, which is considered the most likely failure mode . In the case of directional honeycomb structures like DPFs, flexure is also useful because it provides information about the failure mechanisms that can occur when loading is in the plane of the honeycomb structure.…”

Section: Introductionmentioning

confidence: 99%

Out‐of‐plane mechanical characterization of acicular mullite and aluminum titanate diesel particulate filters

Brodnik

Faber

2018

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

This study characterizes the flexural and compressive behavior of two porous ceramic honeycombs commonly used in diesel particulate filtration, acicular mullite and aluminum titanate. Compression along the axis normal to the honeycomb cross‐section, referred to as out‐of‐plane compression, is compared to in‐plane flexure. The relationship between these loading modes is assessed using the failure strength and elastic modulus of the honeycomb structure and the constituent wall material. Weibull analyzes showed that flexure and out‐of‐plane compression exhibit similar behavior in cases where failure is governed by a single flaw, such as in acicular mullite. However, in heavily microcracked systems like aluminum titanate, compressive failure occurs by damage accumulation rather than growth of a single flaw, so compressive failure strengths are higher than flexural ones. Buckling was also shown to occur in both systems, but the geometries required are unlikely to be encountered in practical application. In the context of filter life assessment, failure in flexure occurs at much lower stresses for systems that rely on microcracking to accommodate thermal strains, so flexure is better suited as an estimate of filter strength.

show abstract

Mechanical and microstructural properties of cordierite-bonded porous SiC ceramics processed by infiltration technique using various pore formers

Cited by 21 publications

References 39 publications

Enhanced 3D printed alumina ceramic cores via impregnation

Enhanced 3D printed alumina ceramic cores via impregnation

Starch consolidation of SiC ceramics: processing and low-temperature sintering in an air atmosphere

Out‐of‐plane mechanical characterization of acicular mullite and aluminum titanate diesel particulate filters

Contact Info

Product

Resources

About