Developments in SiAlON Glasses and their Derivatives: Effects of Chemistry on Properties

2008 ◽  
Vol 403 ◽  
pp. 87-89
Author(s):  
Stuart Hampshire ◽  
Michael J. Pomeroy
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Rare Earth ◽  
Silicon Nitride ◽  
Rare Earth Elements ◽  
Elastic Moduli ◽  
New Research ◽  
Cation Ratios

This paper provides an overview of the preparation of M-Si-Al-O-N glasses and outlines the effects of composition on properties. As nitrogen substitutes for oxygen in sialon glasses, increases are observed in glass transition and softening temperatures, viscosities, elastic moduli and microhardness. If changes are made to the cation ratios or different rare earth elements are substituted, properties can be modified. The effects of these changes on mechanical properties of silicon nitride based ceramics and sialons are discussed. New research on M-Si-Al-O-N-F glasses is outlined.

Oxynitride Glasses and Their Properties - Implications for High Temperature Performance of Silicon Nitride-Based Ceramics

2006 ◽  
Vol 317-318 ◽  
pp. 419-424 ◽  
Author(s):  
Stuart Hampshire ◽  
Michael J. Pomeroy
Keyword(s):  
Glass Transition ◽  
Rare Earth ◽  
High Temperature ◽  
Silicon Nitride ◽  
Elastic Moduli ◽  
Aluminosilicate Glass ◽  
Temperature Behaviour ◽  
Intergranular Films ◽  
Nitride Ceramics ◽  
Earth Cation

Oxynitirde glasses are found at triple point junctions and as intergranular films in silicon nitride based ceramics. The glass chemistry, particularly the content of modifyer,usually Y or a rare earth (RE) ion, and the volume fractions of these oxynitride glass phases within the ceramic control the properties of silicon nitride, in particular, creep at high temperature. It is known that, as nitrogen substitutes for oxygen in silicate and aluminosilicate glass networks, increases are observed in glass transition and softening temperatures, viscosities (by two to three orders of magnitude), elastic moduli and microhardness. If changes are made to the RE:Si:Al ratios or different rare earth cation are substituted, properties such as viscosity can be increased by a further two to three orders of magnitude. These effects have implications for the high temperature properties of silicon nitride based ceramics, especially creep resistance. This paper provides an overview of oxynitride glasses and outlines the effect of composition on properties such as glass transition temperature and viscosity and discusses the effects on high temperature behaviour of silicon nitride ceramics.

Effect of rare earth oxides addition on the mechanical properties and coloration of silicon nitride ceramics

2020 ◽  
Vol 40 (4) ◽  
pp. 1132-1138 ◽  
Author(s):  
Ning Liu ◽  
Jingxian Zhang ◽  
Yusen Duan ◽  
Xingbang Li ◽  
Shaoming Dong
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Silicon Nitride ◽  
Rare Earth Oxides ◽  
Nitride Ceramics

Effect of Zinc Content on the Microstructure, Thermal Behavior, and Static Mechanical Properties of Sn-xZn Alloys Containing Mixed Trace Rare Earth Elements

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Shih-Ying Chang ◽  
An-Bang Wu ◽  
Jun-Yen Lee ◽  
Yan-Hua Huang
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Thermal Behavior ◽  
Zinc Concentration ◽  
Eutectic Temperature ◽  
Solidus Temperature ◽  
Zinc Content ◽  
Static Mechanical ◽  
Static Mechanical Properties

Abstract The microstructure, thermal behavior, and mechanical properties of Sn-xZn-0.1RE (x = 5, 10, 20, and 30 wt%) alloys containing mixed trace rare earth elements were investigated in this study. The results showed that the alloys had the same solidus temperature of about 199 °C. Zinc content higher than 10% enhanced slightly the eutectic temperatures and enlarged the eutectic temperature range of the alloys. The microstructures of most of the alloys exhibited Zn-rich coarse clusters, but not for Sn-5Zn-0.1RE. The tensile strength of the alloys increased with increasing zinc concentration.

Effect of Rare Earth Elements on Machining Characteristics of Austenitic Stainless Steels without Lead Addition

2013 ◽  
Vol 377 ◽  
pp. 128-132
Author(s):  
Zhuang Li ◽  
Di Wu ◽  
Wei Lv ◽  
Shao Pu Kang ◽  
Zhen Zheng
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Large Numbers ◽  
Machining Characteristics ◽  
Lead Addition ◽  
Cutting Speeds ◽  
Better Than

Rare earth elements (REE) are harmless for human health. REE addition contributes to the improvement of the machinability of the steels. In the present paper, machining characteristics of austenitic stainless steels without lead addition were investigated by adding free-machining elements, such as sulfur, REE and bismuth. The results have shown that large numbers of rounded, globular shaped inclusions were obtained for both steels. The machinability of steel B is better than that of steel A, and the cutting forces of steel B are lower than those of steel A at various cutting speeds. Lead can be substituted by REE and bismuth in free machinable austenitic stainless steels. REE significantly affects machining characteristics of austenitic stainless steels without lead addition. The mechanical properties of both steels were similar, and their fracture exhibited ductile characteristics. Satisfactory machinability and mechanical properties can be obtained for both steels.

Study on Aging Strengthening Behavior of ZK60 -2.0%Nd-1.0%Y Alloy

2010 ◽  
Vol 34-35 ◽  
pp. 1651-1655
Author(s):  
An Ru Wu ◽  
Li Jun Dong ◽  
Wei Guo Gao ◽  
Xiang Ling Zhou
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Rare Earth ◽  
Magnesium Alloy ◽  
Rare Earth Elements ◽  
Aging Process ◽  
Equilibrium Phase ◽  
High Strength ◽  
Treatment Method ◽  
Zk60 Alloy

The microstructure and mechanical properties of Mg-6.0%Zn-0.5%Zr (ZK60) and ZK60-2.0%Nd-1.0%Y alloys after extrusion, rolling and then T5 and T6 heat-treatment were investigated. The hardness and tensile strength at T5 and T6 condition were tested. The results show that the mechanical properties of ZK60--2.0%Nd-1.0%Y alloy are superior to that of ZK60 alloy. The hardness of the investigated alloy at T5 condition is higher than at T6. The strengthening of ZK60-2.0%Nd-1.0%Y alloy originates from the interaction of phase and dislocations. The precipitation order of ZK60-2.0%Nd-1.0%Y alloy is GP zone . The magnesium alloy contains rare earth elements with good casting performance, great potential for plastic deformation, high strength, excellent mechanical properties and many other advantages. The magnesium alloy oversaturation solid solution's decomposition process conforms to time the common alloy oversaturation solid solution decomposition order rule, often namely before separating out the equilibrium phase presents some transitional stage the structure, like the GP area, the transition are equal, but the different series magnesium alloy presents the different characteristic, therefore uses the heat treatment method also has big difference [1-5]. In this paper, we will analysis mechanical properties of aging process of testing and microstructure of Mg-6.0% Zn-0.5% Zr-2.0% Nd-1.0% Y alloy , do Research about strengthen the effect of melting and from the product of the relationship on different alloy aging process, and analysis contribution of rare earth elements Nd, Y to alloy strengthen.

Study of rare earth elements on the physical and mechanical properties of a Cu–Fe–P–Cr alloy

2008 ◽  
Vol 147 (1) ◽  
pp. 1-6 ◽  
Author(s):  
F.A. Guo ◽  
C.J. Xiang ◽  
C.X. Yang ◽  
X.M. Cao ◽  
S.G. Mu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Physical And Mechanical Properties

Arrangement of rare-earth elements at prismatic grain boundaries in silicon nitride

2004 ◽  
Vol 84 (12) ◽  
pp. 755-762 ◽  
Author(s):  
G. B. Winkelman * ◽  
C. Dwyer ◽  
T. S. Hudson ◽  
D. Nguyen-Manh ◽  
M. Döblinger ◽  
...  
Keyword(s):  
Rare Earth ◽  
Silicon Nitride ◽  
Rare Earth Elements ◽  
Grain Boundaries
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