Experimental and Finite Element Study of the Thermal Conductivity of α‐SiAlON Ceramics

Kuşhan, Seniz Reyhan; Uzun, İbrahim; Doğan, Battal; Mandal, Hasan

doi:10.1111/j.1551-2916.2007.01993.x

Cited by 20 publications

(18 citation statements)

References 23 publications

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“…The results show that the density, hardness, modulus of elasticity, flexural strength and thermal expansion coefficient of β-SiAlON decreased with an increase in the Z value [6]. It has been reported that, compared to α-SiAlON, β-SiAlON exhibits enhanced fracture toughness and strength as well as high thermal conductivities and thermal shock resistance due to the rod-shaped grain structure [7,8]. Because of its outstanding mechanical and thermal properties at high temperatures, and its excellent chemical stability and thermal shock resistance, β-SiAlON has been attracting considerable attention as an important high-temperature resistant ceramic [9][10][11][12].…”

Section: Introductionmentioning

confidence: 92%

THE SHRINKAGE, PHASE COMPOSITION AND MECHANICAL PROPERTIES OF CERAMICS WITH DIFFERENT β-SiAlON MAIN CRYSTALLINE PHASES PREPARED BY STEREOLITHOGRAPHY

Tian¹

2020

Ceramics - Silikaty

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In this paper, using Si 3 N 4 , Al 2 O 3 and AlN particles as raw materials, β-SiAlON ceramics with different main crystal phases were designed. The green body of the β-SiAlON-matrix ceramic samples were obtained by using stereolithography (SLA) additive manufacturing. After degreasing, dense β-SiAlON ceramics with different SiAlON phases were fabricated through gas pressure sintering at 1800 °C for 1 hour at GPa. The effects of the different Al 2 O 3 contents on the shrinkage, phase composition, relative density, microstructure, mechanical property and hardness were studied. The results indicate that the main phase of the ceramics was β-SiAlON and the specific chemical compositions of it were Si 5 AlON 7 , Si 3.1 Al 2.9 O 2.9 N 5.1 and Si 2 Al 4 O 4 N 4 . The intergranular phases that exists were mainly Y 3 Al 5 O 12 , YAlO 3 and Al 2 O 3 . With a relative density of 90.03 %, the Vickers hardness (Hv5), bending strength and fracture toughness of the fabricated β-Si 5 AlON 7 ceramics were 16.8 GPa, 465 MPa and 4.84 MPa•m 1/2 , respectively. Meanwhile, the shrinkage of the materials was 28.7 %

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Section: Introductionmentioning

confidence: 92%

THE SHRINKAGE, PHASE COMPOSITION AND MECHANICAL PROPERTIES OF CERAMICS WITH DIFFERENT β-SiAlON MAIN CRYSTALLINE PHASES PREPARED BY STEREOLITHOGRAPHY

Tian¹

2020

Ceramics - Silikaty

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“…The Sialon PCP may overcome the above mentioned limitations that limit the other PCPs for extreme high brightness lighting. The α-Sialon ceramics has thermal conductivity around 12 -19 Wm −1 K −1 , which makes the material appropriate for extreme high brightness lighting [11,32].…”

Section: Functional Transparent / Translucent Sialon Ceramicsmentioning

confidence: 99%

Recent advances in transparent / translucent polycrystalline Sialon ceramics

2020

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The transparent polycrystalline ceramics have acquired an interest in different fields such as transparent armor windows, cutting tools, IR windows, wear and scratch resistant parts (watches, bearings, and displays), and synthetic opals and rubies. In recent years, the transparent ceramics are applied in lasers and high power solid state lighting as a luminescent material. Different types of transparent polycrystalline ceramics were reported for different applications. However, there are few transparent ceramics that can withstand the aggressive environment. Recently, some studies on optical properties of Sialon ceramics show that the Sialon ceramics would be suitable for the optical applications. Sialon ceramics are known for their excellent mechanical and thermal properties and applied as a structural ceramics. The Sialon ceramics have all those potentials that can overcome the mechanical and thermal limitations of existing transparent ceramics where a very high grade of transparency is not required. The reported Sialon ceramics are IR transparent and visibly translucent. The translucent Sialon ceramics can be applied as a phosphor ceramic plate (PCP) for high power solid state lighting (SSL). However, the fabrication and production processes are costly due to the high temperature synthesis and complex processing techniques. In this short review, we will discuss the recent trend, processing techniques, properties, applications, and prospects of transparent Sialon ceramics.

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“…In order to obtain dense materials, Ilmars Zalite et al [8] prepared α-and α-/β-Sialon composites using five plasma-synthesized nanopowders such as Si 3 N 4 , the mixture of 90%Si 3 It has been reported that β-Sialon exhibited enhanced fracture toughness and strength as well as high thermal conductivities compared to α-Sialon due to their rod shape grain structure [9,10]. In addition, β-Sialon showed nontoxicity, good electrical insulation and thermal shock resistance properties, which enabled it to be a promising candidate for high-speed circuits and power devices as heat dissipation and packaging material [11].…”

Section: Introductionmentioning

confidence: 99%