Enhancement of Hydrophilic Properties of Alumina-Based Ceramics

Kita, Hideki; Hyuga, Hideki; Yoshida, Katsumi; Osumi, Kazuo; Iizuka, Tateoki

doi:10.2109/jcersj.114.347

Cited by 6 publications

(4 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, due to the high surface tension of water, the surface energy of the system increases when wetting with this solvent. Hence, relatively large contact angles are obtained even on ideally flat surfaces even though the material is generally considered to be hydrophilic 15 . Experiments with ethane diol confirm that a hydrophilic solvent with a lower surface energy yields lower contact angles (Table II).…”

Section: Resultsmentioning

confidence: 94%

Wettability Assessment of Submicrometer Alumina Powder Using a Modified Washburn Method

Neirinck

Deursen

Biest

et al. 2010

Journal of the American Ceramic Society

View full text Add to dashboard Cite

The possibility to accurately measure the liquid–solid contact angle on submicrometer powders by means of a modified capillary rise setup using cold isostatically pressed powder compacts is reported. The geometric factor needed for the determination of the contact angle from liquid penetration data was calculated from the pore properties of the powder compacts. During the capillary rise experiments, the pellets retained their structural integrity and concomitant porosity ensuring the reproducibility of the contact angle values obtained.

show abstract

Section: Resultsmentioning

confidence: 94%

Wettability Assessment of Submicrometer Alumina Powder Using a Modified Washburn Method

Neirinck

Deursen

Biest

et al. 2010

Journal of the American Ceramic Society

View full text Add to dashboard Cite

show abstract

“…The details of the formation mechanism on those phases can be found in a previous report. 10 Of these dispersed phases, ZnAl 2 O 4 particles have preferentially fallen out; they appear white in the SEM image in Fig. 5.…”

Section: Resultsmentioning

confidence: 98%

“…Through a series of studies on alumina-based materials with enhanced hydrophilic properties, the present authors have identified that ZnO is as an effective additive for improving the hydrophilic properties of alumina, although the mechanism remains unclear. 10 The present study is intended to analyze the changes in the microstructure and properties of this material that occur mainly upon long-term sliding.…”

Section: Introductionmentioning

confidence: 99%

Changes in Microstructure and Properties of ZnO-Added Al2O3 upon Sliding

Kita

Osumi

Iizuka

et al. 2006

J. Ceram. Soc. Japan

Self Cite

View full text Add to dashboard Cite

ɛ‫˚̨ك‬ᚊ‫ף‬ȪɳɧɒǽၽؔǺΒǕẻόȓᣀමǽং‫ك‬‫ل‬ ⇠ẃɿগ╦݅᧯ଉ ɿ‫‬झೈ⅟ଉ ɿᱨ કɿ۱ᨀӡడɿᅠ۹ᲂᑰ ᧳Ꮱཪ⒈ἕ۰ᮾ᳣ཀࢫ463-8560 ۵‫ୖے‬లમ୮ٚˁᔲ‫ܬ‬᳡ɾᗻ 2266-98 ଉ ጋǓǨȦ˛ঞᮾ᳣ཀࢫ252-8501 ⍪ᖴలᎉ 8The changes in microstructure and properties of ZnO-added alumina upon sliding under water lubrication were studied. Although the frictional force was lower than that of conventional alumina in the early stages, it increased upon long-term friction testing. Of the acicular ZnO-nAl 2 O 3 nࢼ3-9 and granular ZnAl 2 O 4 phases dispersed in the samples, ZnAl 2 O 4 with its low hardness was worn preferentially and pulled out during testing. The increase of frictional force during the sliding process was attributed to the pull-out of ZnAl 2 O 4 particles and their traction on the sliding surface during the experiment.

show abstract

“…It has been reported that the mechanical properties of silicon nitride ceramics fabricated via the sRBSN process usually are not as good as those of silicon nitride ceramics prepared using the conventional gas-pressure sintering process. Kita et al 49) reported that the strength of silicon nitride fabricated using the sRBSN process was about 520 MPa. Kondo et al 50) reported that silicon nitride obtained using the sRBSN method had a strength of approximately 500 MPa and a fracture toughness of 4.2 MPa m 1/2 .…”

Section: Sintered Reaction Bonding Process With Rapid Nitridation Tecmentioning

confidence: 99%

Development of efficient fabrication processes for highly functional silicon nitride ceramics: a review

Hyuga

2018

J. Ceram. Soc. Japan

Self Cite

View full text Add to dashboard Cite

This study reviews the development of fabrication processes for silicon nitride ceramics with excellent mechanical properties, such as high fracture strength and fracture toughness. Silicon nitride ceramics with high wear resistance and thermal conductivity have been produced by tuning their composition and utilizing highly efficient processing techniques. The nitridation behavior of silicon powder in the presence of Zr compounds has been studied in order to assess the nitridation enhancement effect of zirconium during formation of reaction bonded silicon nitride. Thermogravimetric analysis has revealed that the addition of ZrO 2 to Si powder reduces the temperature of the main nitridation reaction. It is possible to produce reaction-bonded silicon nitride using a rapid nitridation technique with a heating rate of over 5°C/min, which is 80 times higher than that for the conventional reaction bonding process. A nitridation enhancement effect has also been observed with the addition of some rare-earth oxides. The reaction bonding process has been used to fabricate high-thermalconductivity silicon nitride ceramics with a relatively short processing time. Si 3 N 4 /carbon fiber composites have been developed using randomly dispersed high-tensile-modulus carbon fibers. The aligned silicon nitride grains and short carbon fibers in the composites result in both high fracture strength and toughness and a low friction coefficient under dry and water sliding conditions. The mechanical properties of the composites are anisotropic with respect to the grain alignment, with both strength and toughness being highest parallel to the extrusion direction. In this direction, the seeded specimen, with both silicon nitride grains and carbon fibers aligned, has higher fracture toughness and higher fracture strength than those of the non-seeded specimen, with only fibers aligned.

show abstract

Enhancement of Hydrophilic Properties of Alumina-Based Ceramics

Cited by 6 publications

References 9 publications

Wettability Assessment of Submicrometer Alumina Powder Using a Modified Washburn Method

Wettability Assessment of Submicrometer Alumina Powder Using a Modified Washburn Method

Changes in Microstructure and Properties of ZnO-Added Al2O3 upon Sliding

Development of efficient fabrication processes for highly functional silicon nitride ceramics: a review

Contact Info

Product

Resources

About