scholarly journals Study in Optical and Mechanical Properties of Nd3+, Y3+: SrF2 Transparent Ceramics Prepared by Hot-Pressing and Hot-Forming Techniques

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 619
Author(s):  
Shaoyong Qin ◽  
Jinghong Song ◽  
Wuxiao Wang ◽  
Bingchu Mei ◽  
Weiwei Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Hot Pressing ◽  
Deformation Rate ◽  
Continuous Wave ◽  
Hot Forming ◽  
Transparent Ceramics ◽  
Optical And Mechanical Properties ◽  
Grown Single Crystal ◽  
Better Than

Nd3+, Y3+: SrF2 transparent ceramics were successfully synthesized by two methods: hot-forming and hot-pressing techniques. The mechanical properties and optical properties of the hot-formed Nd3+, Y3+: SrF2 transparent ceramics were much better than that of single crystal. On the other hand, the transmittance of the hot-formed transparent ceramics with different deformation rate reached up to 90% at 1054 nm, which is superior to the hot-pressed ceramics. Furthermore, the fracture toughness of hot-formed Nd3+, Y3+: SrF2 transparent ceramics with the deformation rate of 51% reached up to 0.70 MPa m1/2, which is nearly 1.5 times higher than that of as-grown single crystal. The full width at half maximum (FWHM) of the hot-formed ceramic is larger than that of the single crystal at 1053 nm under continuous-wave (CW) laser operation. The thermal conductivity of Nd3+, Y3+: SrF2 single crystal and hot-formed ceramics were also discussed.

Effects of Sintering Process on the Properties of Ti3SiC2/Cu Composite

2012 ◽  
Vol 512-515 ◽  
pp. 377-381 ◽  
Author(s):  
Jin Rong Lu ◽  
Yang Zhou ◽  
Yong Zheng ◽  
Shi Bo Li ◽  
Zhen Ying Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Sintering Temperature ◽  
Sintering Process ◽  
Vacuum Sintering ◽  
New Type ◽  
Sintering Conditions ◽  
The Relationship ◽  
Better Than

In this paper, a new type of Ti3SiC2/Cu composites with the volume fractions of 30% Ti3SiC2 particle was prepared by hot pressing and vacuum sintering respectively. The effects of sintering temperature and holding time on the density, resistance and Vickers hardness of Cu-30vol%Ti3SiC2 composite were investigated. The results show that the mechanical properties of the composites prepared by hot pressing are better than that prepared by vacuum sintering. The relative densities of Cu-30vol% Ti3SiC2 composites are rather high in suitable sintering conditions. It achieved 100% for the composites prepared by hot pressing at 930°C for 2h, and 98.4% for the composites prepared by vacuum sintering at 1250°C for 1h. At the same time, the maximum Vickers hardness reached 1735MPa at 900°C by hot pressing. The resistance and Vickers hardness of the composites decreased with an increase in sintering temperature, whereas the density increased. Scanning electron microscope (SEM) and energy-dispersive spectroscopy (EDS) were used to observe the microstructure of the composites. The relationship between microstructure and mechanical properties was discussed.

Effect of Tb4O7 content on the optical and mechanical properties of transparent ceramics based on MgAl2O4

2019 ◽  
Vol 19 ◽  
pp. 2089-2092
Author(s):  
V.D. Paygin ◽  
E.S. Dvilis ◽  
O.L. Khasanov ◽  
S.A. Stepanov ◽  
D.T. Valiev
Keyword(s):  
Mechanical Properties ◽  
Transparent Ceramics ◽  
Optical And Mechanical Properties

Structural, Optical and Mechanical Properties and Cracking Factors of Large-Sized KBr:Ce3+ Single Crystal

2020 ◽  
Vol 49 (8) ◽  
pp. 4785-4793 ◽  
Author(s):  
Yongtao Li ◽  
Yongju Li ◽  
Zhenxiao Yang ◽  
Xuejian Zhang ◽  
Jinghe Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Optical And Mechanical Properties

Fabrication and Properties of Machinable AlN-BN Ceramic Nanocomposites

2006 ◽  
Vol 317-318 ◽  
pp. 637-640 ◽  
Author(s):  
Hai Yun Jin ◽  
Wen Wang ◽  
Ji Qiang Gao ◽  
Guan Jun Qiao ◽  
Zhi Hao Jin
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Nitrogen Atmosphere ◽  
Weak Interface ◽  
X Ray Diffraction ◽  
Mechanical Mixing ◽  
X Ray ◽  
N2 Atmosphere ◽  
Nanocomposite Powders ◽  
Better Than

The AlN/h-BN nanocomposite powders were synthesized through the reaction of AlN powder, boric acid (H3BO3) and urea (CO(NH2)2) in a nitrogen atmosphere, and the machinable AlN/BN ceramic nanocomposite s were fabricated by hot-pressing in N2 atmosphere. The existing and distribution of h-BN phase are revealed by X-ray diffraction (XRD), TEM and SEM. For the existing of weak interface between h-BN and AlN grains, the machinability of AlN/BN composites is improved obviously. For the finer microstructures, the mechanical properties and the machinability of the composites with micrometer sized AlN coated with nano-sized BN are better than the AlN/h-BN composite of mechanical mixing type.

Processing, mechanical properties and oxidation behavior of TaC and HfC composites containing 15 vol% TaSi2 or MoSi2

2009 ◽  
Vol 24 (6) ◽  
pp. 2056-2065 ◽  
Author(s):  
Diletta Sciti ◽  
Laura Silvestroni ◽  
Stefano Guicciardi ◽  
Daniele Dalle Fabbriche ◽  
Alida Bellosi
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Temperature ◽  
Mechanical Strength ◽  
Hot Pressing ◽  
Room Temperature ◽  
Oxidation Behavior ◽  
Temperature Stability ◽  
High Temperature Stability ◽  
Better Than

Fully dense HfC and TaC-based composites containing 15 vol% TaSi2 or MoSi2 were produced by hot pressing at 1750–1900 °C. TaSi2 enhanced the sinterability of the composites and nearly fully dense materials were obtained at lower temperatures than in the case of MoSi2-containing ones. The TaC-based composites performed better than HfC composites at room temperature, showing values of mechanical strength up to 900 MPa and a fracture toughness of 4.7 MPa·m1/2. However, preliminary oxidation tests carried out in air at 1600 °C revealed that HfC-based composites have a superior high temperature stability compared to TaC-based materials.

Structural, optical and mechanical properties of Y2Ti2O7 single crystal

2020 ◽  
Vol 187 ◽  
pp. 227-231
Author(s):  
M. Suganya ◽  
K. Ganesan ◽  
P. Vijayakumar ◽  
Amirdha Sher Gill ◽  
R. Ramaseshan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Optical And Mechanical Properties
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