Journal ArticleDOI
Sintering of Si3N4 with the Addition of Rare-Earth Oxides
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In this paper, the effect of rare-earth oxide additives on the densification of silicon nitride by pressureless sintering at 1600° to 1700°C and by gas pressure sinterings under 10 MPa of N2 at 1800° to 2000°C was studied.Abstract:
The effect of rare-earth oxide additives on the densification of silicon nitride by pressureless sintering at 1600° to 1700°C and by gas pressure sintering under 10 MPa of N2 at 1800° to 2000°C was studied. When a single-component oxide, such as CeO2, Nd2O3, La2O3, Sm2O3, or Y2O3, was used as an additive, the sintering temperature required to reach approximate theoretical density became higher as the melting temperature of the oxide increased. When a mixed oxide additive, such as Y2O3–Ln2O3 (Ln=Ce, Nd, La, Sm), was used, higher densification was achieved below 2000°C because of a lower liquid formation temperature. The sinterability of silicon nitride ceramics with the addition of rare-earth oxides is discussed in relation to the additive compositions.read more
Citations
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Journal ArticleDOI
Mechanical properties of silicon nitride-based ceramics and its use in structural applications at high temperatures
TL;DR: In this paper, the room temperature and high-temperature properties of Si 3 N 4 based ceramics are discussed and described in more detail, and a variety of interesting properties can be specifically designed to produce a given behavior profile.
Book ChapterDOI
Sintering of Ceramics
TL;DR: The focus of sintering science is changing from the modification of microstructures in incremental ways for correspondingly incremental improvement in properties to more effectual manipulation of microstructure to optimize properties as mentioned in this paper.
Journal ArticleDOI
Fabrication and Secondary‐Phase Crystallization of Rare‐Earth Disilicate–Silicon Nitride Ceramics
TL;DR: The fabrication and intergranular phase devitrification of silicon nitride densified with rare-earth oxide additives has been investigated in this paper, where the addition of the oxides of Sm, Gd, Dy, Er, and Yb, having high melting points and behaving similarly to Y2O3, were compositionally controlled to tailor a microstructure with a crystalline secondary phase of RE2Si2O7.
Journal ArticleDOI
Grain Boundary Films in Rare‐Earth‐Glass‐Based Silicon Nitride
TL;DR: In this article, the thickness of intergranular films in Si{sub 3}N{sub 4} densified with lanthanide oxides has been systematically investigated using high-resolution transmission electron microscopy.
Journal ArticleDOI
Microstructural Evolution and Mechanical Properties of Si3N4 with Yb2O3 as a Sintering Additive
TL;DR: In this paper, the amount of Yb2O3 was used as a sintering aid to enhance the mechanical properties of silicon nitride (Si3N4) ceramics.
References
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Journal ArticleDOI
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
Book
Phase diagrams for ceramists
TL;DR: One of the popular books now is the phase diagrams for ceramists as discussed by the authors. You may be confused because you can't find the book in the book store around your city. And when you have found the store to buy the book, it will be so hurt when you run out of it.
Journal ArticleDOI
Densification during Sintering in the Presence of a Liquid Phase. I. Theory
TL;DR: In this paper, the driving force leading to densification during sintering in the presence of a liquid phase and the material transport phenomena have been analyzed and relationships for the densification rate during the rearrangement process, the solution-precipitation process, and the final coalescence process have been determined.
Journal ArticleDOI
Tensile and creep strengths of hot-pressed Si3N4
TL;DR: In this article, tensile, creep, and stress-rupture data for Norton HS-110 and HS-130 hot-pressed Si3N4 are presented, and it is shown that the strength of the material is controlled by the grain-boundary glass phase.
Journal ArticleDOI
Dense silicon nitride
TL;DR: In this article, a method for preparing silicon nitride bodies of almost theoretical density is described, where the powder is hot pressed with a small proportion of catalyst, preferably magnesium oxide or nitride, at 1850°C.