Recent advances in transparent / translucent polycrystalline Sialon ceramics

Abstract

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.

Ceramic Cutting Materials and Tools Suitable for Machining High-Temperature Nickel-Based Alloys: A Review

“…α-SiAlONs are isostructural with α-Si 3 N 4 in which chemical binding of m and n (Si-N) are substituted by Al-N (m) and Al-O (n) bonds, respectively, the schematic diagram of which is shown in Figure2[136][137][138]. In addition, supplementary cation for the stability of crystal lattice of α-SiAlONs is needed.…”

Development of mixed halide translucent ceramics for imaging plates

“…Coble et al, and the Al 2 O 3 translucent ceramic for high pressure sodium lamps was released by General Electric Cop. 62) Subsequently, translucent ceramics have been used in solid-state lasers, 63,64) solid-state lighting, [65][66][67] magnetooptical materials, [68][69][70] and scintillators [71][72][73][74] because they have merits such as high thermal property, high mechanical strength, high uniformity, and cost-effectiveness compared to single crystals. In addition, translucent ceramics can be doped with activated ions with higher concentrations and synthesized at lower temperatures.…”