Microstructural design of Ca α-sialon ceramics: effects of starting compositions and processing conditions

Zhang, Yu; Cheng, Yi‐Bing

doi:10.1016/s0955-2219(02)00300-x

Cited by 15 publications

(9 citation statements)

References 20 publications

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“…In the present study, relatively low values of translucency were observed for all three sintering protocols tested, with a slightly better performance of the SS group (Table 1). However, the SS and S groups exhibited a slightly lower hardness value relative to group LT , due probably to a larger grain size observed in group LT [28]. …”

Section: Resultsmentioning

confidence: 99%

Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical, mechanical, and wear characteristics

Kaizer

Gierthmuehlen

Santos

et al. 2017

Ceramics International

105

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The fabrication of zirconia dental restorations is a time-consuming process due to traditional slow sintering schemes; zirconia (Y-TZP) produced by these conventional routes are predominantly opaque. Novel speed sintering protocols have been developed to meet the demand for time and cost effective chairside CAD/CAM-produced restorations, as well as to control ceramic microstructures for better translucency. Although the speed sintering protocols have already been used to densify dental Y-TZP, the wear properties of these restorations remain elusive. Fast heating and cooling rates, as well as shorter sintering dwell times are known to affect the microstructure and properties of zirconia. Thus, we hypothesize that speed sintered zirconia dental restorations possess distinct wear and physical characteristics relative to their conventionally sintered counterparts. Glazed monolithic molar crowns of translucent Y-TZP (inCoris TZI, Sirona) were fabricated using three distinct sintering profiles: Super-speed (SS, 1580 °C, dwell time 10 min), Speed (S, 1510 °C, dwell time 25 min), and Long-term (LT, 1510 °C, dwell time 120 min). Microstructural, optical and wear properties were investigated. Crowns that were super-speed sintered possessed higher translucency. Areas of mild and severe wear were observed on the zirconia surface in all groups. Micropits in the wear crater were less frequent for the LT group. Groups S and SS exhibited more surface pits, which caused a scratched steatite surface that is associated with a greater volume loss. Tetragonal to monoclinic phase transformation, resulting from the sliding wear process, was present in all three groups. Although all test groups had withstood thermo-mechanical challenges, the presence of hairline cracks emanating from the occlusal wear facets and extending deep into the restoration indicates their susceptibility to fatigue sliding contact fracture.

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Section: Resultsmentioning

confidence: 99%

Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical, mechanical, and wear characteristics

Kaizer

Gierthmuehlen

Santos

et al. 2017

Ceramics International

105

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“…It is known that the decomposition of Si 3 N 4 ceramics and SiAlONs cannot be fully suppressed by 0.9 MPa of nitrogen at 2000 o C. 17) The maximum relative density through the current experiment was close to 90%, which is lower than the reported density of Ca-α-SiAlONs for engineering applications. 16,[18][19][20][21][22] In spite of the deviation from the full density condition, useful knowledge regarding the compositional design of the Ca-α-SiAlON:Eu 2+ plate phosphor was acquired. First, the increase in the 'm' value for the compositions in the Si 3 N 4 -CaO• 3AlN tie line, m=1.5 for α1 and m = 3.0 for α2, promoted densification.…”

Section: Resultsmentioning

confidence: 99%

The Densification and Photoluminescence Characteristics of Ca-α-SiAlON:Eu²⁺Plate Phosphor

Park¹,

Lee²,

Kim³

et al. 2013

Journal of the Korean Ceramic Society

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Plate-type phosphor is a promising substitute in overcoming the issues related to the powder phosphor paste mixed with resin. In this research, Ca-α-SiAlON:Eu 2+ plate phosphor (Ca x Si 12-(m+n) Al m+n O n N 16-n :Eu y) was investigated for the varied compositions (m,n) of the host crystal with the fixed Eu content (y). Densification was promoted for the compositions with increasing 'm' values for the m=2n relationship. Dictated by the Eu concentration inside the phosphor crystal, photoluminescence intensity was stronger in α2 specimen (m = 3.0, n = 1.5) containing the second phases when compared to α1 specimen (m = 1.5, n = 0.75) comprising a single-phase α-SiAlON. The concentration of Eu in the non-emitting amorphous interfacial glass phase was 2~4 times of the designed Eu concentration inside the α-SiAlON crystal.

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“…x is related to m according to the relationship x = m/ν and has a value ≤2 (Hampshire et al, 1978). Details of the compositional design and powder preparation procedures of these materials are described in a previous paper (Zhang and Cheng, 2003). Composition CA1005 lay inside the single-phase α-sialon forming region of the Ca α-sialon-phase diagram, while composition CA2613 was situated just outside the single-phase region on the Al-rich side.…”

Section: Materials Selectionmentioning

confidence: 99%

“…Compared to Si 3 N 4 and SiC, sialon ceramics have greater phase complexity and more degrees of freedom for tailoring of microstructures and consequently mechanical properties. It was also found that a high α-sialon content coupled with low intergranular glass and pore contents gave an optimized hardness (Zhang et al, 2001;Zhang and Cheng, 2003). The microstructural-mechanical properties relation of the Ca α-sialon materials has been studied in detail previously (Zhang et al, 2001;Zhang and Cheng, 2003).…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Silicon nitride and silicon carbide-based ceramics

ZHANG

2006

Ceramic-Matrix Composites

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Microstructural design of Ca α-sialon ceramics: effects of starting compositions and processing conditions

Cited by 15 publications

References 20 publications

Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical, mechanical, and wear characteristics

Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical, mechanical, and wear characteristics

The Densification and Photoluminescence Characteristics of Ca-α-SiAlON:Eu²⁺Plate Phosphor

Silicon nitride and silicon carbide-based ceramics

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Microstructural design of Ca α-sialon ceramics: effects of starting compositions and processing conditions

Cited by 15 publications

References 20 publications

Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical, mechanical, and wear characteristics

Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical, mechanical, and wear characteristics

The Densification and Photoluminescence Characteristics of Ca-α-SiAlON:Eu2+Plate Phosphor

Silicon nitride and silicon carbide-based ceramics

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Product

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The Densification and Photoluminescence Characteristics of Ca-α-SiAlON:Eu²⁺Plate Phosphor