Oxidation of ZrB[sub 2]-Based Ceramics in Dry Air

Monteverde, Frédéric; Bellosi, A.

doi:10.1149/1.1618226

Cited by 277 publications

(244 citation statements)

References 22 publications

Supporting

Mentioning

212

Contrasting

Order By: Relevance

“…(1)-(5) in Table 3 [19], [20] indicate the formation of a borosilicate glass layer and the occurrence of an oxidation reaction after the specific sintering process by electrical discharge plasma [7]. The results suggest that when sintering of the SiC-ZrB 2 composites is carried out in an argon atmosphere, a small amount of SiC is always oxidized to SiO 2 .…”

Section: Apparent Densitymentioning

confidence: 94%

See 1 more Smart Citation

A Study on Optimum Spark Plasma Sintering Conditions for Conductive SiC-ZrB₂Composites

Lee¹,

Ju²,

Kim³

et al. 2011

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

-Conductive SiC-ZrB 2 composites were produced by subjecting a 40:60 (vol%) mixture of zirconium diboride (ZrB 2 ) powder and β-silicon carbide (SiC) matrix to spark plasma sintering (SPS). Sintering was carried out for 5 min in an argon atmosphere at a uniaxial pressure and temperature of 50 MPa and 1500 °C, respectively. The composite sintered at a heating speed of 25 °C/min and an on/off pulse sequence of 12:2 was denoted as SZ12L. Composites SZ12H, SZ48H, and SZ10H were obtained by sintering at a heating speed of 100 °C/min and at on/off pulse sequences of 12:2, 48:8, and 10:9, respectively. The physical, electrical, and mechanical properties of the SiC-ZrB 2 composites were examined and thermal image analysis of the composites was performed. The apparent porosities of SZ12L, SZ12H, SZ48H, and SZ10H were 13.35%, 0.60%, 12.28%, and 9.75%, respectively. At room temperature, SZ12L had the lowest flexural strength (286.90 MPa), whereas SZ12H had the highest flexural strength (1011.34 MPa). Between room temperature and 500 °C, the SiC-ZrB 2 composites had a positive temperature coefficient of resistance (PTCR) and linear V-I characteristics. SZ12H had the lowest PTCR and highest electrical resistivity among all the composites. The optimum SPS conditions for the production of energy-friendly SiC-ZrB 2 composites are as follows: 1) an argon atmosphere, 2) a constant pressure of 50 MPa throughout the sintering process, 3) an on/off pulse sequence of 12:2 (pulse duration: 2.78 ms), and 4) a final sintering temperature of 1500 °C at a speed of 100 °C/min and sintering for 5 min at 1500 °C.

show abstract

Section: Apparent Densitymentioning

confidence: 94%

“…A study on several ZrB 2 -based ceramics revealed that ZrB 2 containing 30 vol% SiC had the highest strength, fracture toughness, and oxidation resistance among all the ceramics tested [6]. The addition of SiC particles enhanced the oxidation resistance of ZrB 2 by promoting the formation of a protective borosilicate glass layer [7].…”

Section: Introductionmentioning

confidence: 99%

A Study on Optimum Spark Plasma Sintering Conditions for Conductive SiC-ZrB₂Composites

Lee¹,

Ju²,

Kim³

et al. 2011

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

show abstract

“…According to Eqs. 2 and 4 in Table 2 [14]- [15], through the specific sintering process, SiO 2 amorphous glass phase and porosity have formed, which may cause high apparent porosity. Moreover, due to the fact the remaining vol.% of SiC that always contains SiO 2 decreases as the addition of ZrB 2 increases, a mass variation decreases according to Eqs.…”

Section: Apparent Densitymentioning

confidence: 99%

The Development of an Electroconductive SiC-ZrB₂Composite through Spark Plasma Sintering under Argon Atmosphere

Lee¹,

Ju²,

Kim³

et al. 2010

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

-The SiC-ZrB 2 composites were fabricated by combining 30, 35, 40, 45 and 50 vol. % of zirconium diboride (ZrB 2 ) powders with silicon carbide (SiC) matrix. The SiC-ZrB 2 composites and the sintered compacts were produced through spark plasma sintering (SPS) under argon atmosphere, and its physical, electrical, and mechanical properties were examined. Also, the thermal image analysis of the SiC-ZrB 2 composites was examined. Reactions between β-SiC and ZrB 2 were not observed via x-ray diffraction (XRD) analysis. The apparent porosity of the SiC+30vol.%ZrB 2 , SiC+35vol.%ZrB 2 , SiC+40vol.%ZrB 2, SiC+45vol.%ZrB 2 and SiC+50vol.%ZrB 2 composites were 7.2546, 0.8920, 0.6038, 1.0981, and 10.0108%, respectively. The XRD phase analysis of the sintered compacts demonstrated a high phase of SiC and ZrB 2 . Among the SiC+ZrB 2 composites, the SiC+50vol. %ZrB 2 composite had the lowest flexural strength, 290.54MPa, the other composites had more than 980MPa flexural strength except the SiC+30vol.%ZrB 2 composite; the SiC+40vol.%ZrB 2 composite had the highest flexural strength, 1011.34MPa, at room temperature. The electrical properties of the SiC-ZrB 2 composites had positive temperature coefficient resistance (PTCR). The V-I characteristics of the SiC-ZrB 2 composites had a linear shape in the temperature range from room to 500℃. The electrical resistivities of the SiC+30vol.%ZrB 2 , SiC+35vol.%ZrB 2 , SiC+40vol.%ZrB 2 SiC+45vol.%ZrB 2 and SiC+50vol.%ZrB 2 composites were 4.573×10 -3 , 1.554×10 -3 , 9.365×10 -4 , 6.999×10 -4 , and 6.069×10 -4 Ω·cm, respectively, at room temperature, and their resistance temperature coefficients were 1.896×10 -3 , 3.064×10 -3 , 3.169×10 -3 , 3.097×10 -3 , and 3.418×10 -3 /℃ in the temperature range from room to 500℃, respectively. Therefore, it is considered that among the sintered compacts the SiC+35vol.%ZrB 2 , SiC+40vol.%ZrB 2 and SiC+45vol.%ZrB 2 composites containing the most outstanding mechanical properties as well as PTCR and V-I characteristics can be used as an energy friendly ceramic heater or ohmic-contact electrode material through SPS.

show abstract

“…1)3) However, densification of ZrB 2 is difficult, because of its high melting temperature and strong covalent bonding. Without sintering additive, densification of ZrB 2 typically requires pressure-assisted sintering at 21002300°C.…”

Section: Introductionmentioning

confidence: 99%

Low temperature densification of ZrB<sub>2</sub> by the mechanical pre-treatment of particles

Lee

Yun

et al. 2013

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

The effects of the pre-treatment of commercially available powder by high energy ball milling on the densification of highly refractory ZrB 2 were investigated. The pristine powder could be crushed into 10 nm in size by high energy ball milling. The resultant powder was densified, using spark plasma sintering apparatus under 120 MPa pressure. Dense ZrB 2 with fine microstructure was obtained after sintering at 1425°C for 1 h. The ultra-fine particle size of crushed ZrB 2 , and the deformation of the powders and grains by dislocation played important roles in the low temperature densification of the pre-treated ZrB 2 powder. WC, which was incorporated during the milling process from WCCo balls, formed a solid solution with ZrB 2 , and promoted grain growth at and above 1450°C. In contrast, Co was mostly segregated at the grain boundary. The 4-point bending strength of the specimens sintered at 1450°C was 481 MPa. The densification of ZrB 2 could be strongly promoted by high energy ball milling treatment of the raw powder, and the resultant specimens had good mechanical properties.

show abstract

Oxidation of ZrB[sub 2]-Based Ceramics in Dry Air

Cited by 277 publications

References 22 publications

A Study on Optimum Spark Plasma Sintering Conditions for Conductive SiC-ZrB₂Composites

A Study on Optimum Spark Plasma Sintering Conditions for Conductive SiC-ZrB₂Composites

The Development of an Electroconductive SiC-ZrB₂Composite through Spark Plasma Sintering under Argon Atmosphere

Low temperature densification of ZrB<sub>2</sub> by the mechanical pre-treatment of particles

Contact Info

Product

Resources

About

Oxidation of ZrB[sub 2]-Based Ceramics in Dry Air

Cited by 277 publications

References 22 publications

A Study on Optimum Spark Plasma Sintering Conditions for Conductive SiC-ZrB2Composites

A Study on Optimum Spark Plasma Sintering Conditions for Conductive SiC-ZrB2Composites

The Development of an Electroconductive SiC-ZrB2Composite through Spark Plasma Sintering under Argon Atmosphere

Low temperature densification of ZrB<sub>2</sub> by the mechanical pre-treatment of particles

Contact Info

Product

Resources

About

A Study on Optimum Spark Plasma Sintering Conditions for Conductive SiC-ZrB₂Composites

A Study on Optimum Spark Plasma Sintering Conditions for Conductive SiC-ZrB₂Composites

The Development of an Electroconductive SiC-ZrB₂Composite through Spark Plasma Sintering under Argon Atmosphere