Efficiency degradation of laser ceramics caused by inappropriate dispersants and sintering aids

2021 ◽  
pp. 111789
Author(s):  
Meng Ni ◽  
Danlei Yin ◽  
Jun Wang ◽  
Jie Ma ◽  
Zhili Dong ◽  
...  
Keyword(s):  
Sintering Aids ◽  
Laser Ceramics

Tensile Creep of Y-Si3N4: II. Cavitation

1991 ◽  
Vol 49 ◽  
pp. 972-973 ◽  
Author(s):  
B. J. Hockey ◽  
S. M. Wiederhorn
Keyword(s):  
Silicon Nitride ◽  
Creep Rupture ◽  
Tensile Creep ◽  
Sintering Aids ◽  
Microstructural Changes

ATEM has been used to characterize three different silicon nitride materials after tensile creep in air at 1200 to 1400° C. In Part I, the microstructures and microstructural changes that occur during testing were described, and consistent with that description the designations and sintering aids for these materials were: W/YAS, a SiC whisker reinforced Si3N4 processed with yttria (6w/o) and alumina (1.5w/o); YAS, Si3N4 processed with yttria (6 w/o) and alumina (1.5w/o); and YS, Si3N4 processed with yttria (4.0 w/o). This paper, Part II, addresses the interfacial cavitation processes that occur in these materials and which are ultimately responsible for creep rupture.

Al2O3 and CaO as sintering aids: A strategy to remove impurity boron and SiO2 surface-layer of diamond wire saw silicon waste

2021 ◽  
Vol 270 ◽  
pp. 118823
Author(s):  
Guangyu Chen ◽  
Yan Li ◽  
Wang Sheng ◽  
Liuqing Huang ◽  
Lizhi Tang ◽  
...  
Keyword(s):  
Surface Layer ◽  
Sintering Aids ◽  
Diamond Wire ◽  
Sio2 Surface ◽  
Wire Saw ◽  
Diamond Wire Saw

Effects of sintering aids on the microstructure and mechanical properties of laminated Si3N4/BN ceramics

2003 ◽  
Vol 57 (22-23) ◽  
pp. 3473-3478 ◽  
Author(s):  
Cuiwei Li ◽  
Chang-an Wang ◽  
Yong Huang ◽  
Qingfeng Zan ◽  
Shike Zhao
Keyword(s):  
Mechanical Properties ◽  
Sintering Aids ◽  
Microstructure And Mechanical Properties

Effect of sintering aids on tribological characteristics of Si3N4 ceramics at 120 °C in water

Wear ◽  
1994 ◽  
Vol 179 (1-2) ◽  
pp. 63-67 ◽  
Author(s):  
Satoshi Kitaoka ◽  
Toshihide Tsuji ◽  
Toshio Katoh ◽  
Yoshimi Yamaguchi ◽  
Kōji Sato
Keyword(s):  
Tribological Characteristics ◽  
Sintering Aids ◽  
Si3n4 Ceramics

State-of-the-art Laser Ceramics for the Next-generation Solid-state Laser

2021 ◽  
Vol 30 (10) ◽  
pp. 22-27
Author(s):  
Ho Jin MA ◽  
Ha-Neul KIM
Keyword(s):  
Solid State ◽  
Mechanical Characteristics ◽  
High Energy ◽  
Solid State Lasers ◽  
Laser Ceramics ◽  
Host Materials ◽  
Laser Systems ◽  
Energy Laser ◽  
High Energy Laser ◽  
Gain Media

Solid-state lasers have aroused many researchers’ interests for a variety of applications in military and industrial fields. Because of the preference for increased output power, Nd:YAG single crystals, which are the most widely used gain media, should be replaced by other more suitable candidates. Polycrystalline sesquioxide ceramics show great potential for use as gain media because their thermal and mechanical characteristics are suitable for use with high-energy laser systems. Recently, novel concepts of the gain media were also introduced. Herein, while briefly looking back on the progress of polycrystalline laser ceramics, we will discuss new interests in host materials and systems.

Mechanosynthesis, Radiation-Thermal Modification and Characterization of Nanostructured Scandia Stabilized Zirconia Ceramics

2008 ◽  
Vol 1122 ◽  
Author(s):  
Vladimir V. Zyryanov ◽  
Nikolay F. Uvarov ◽  
Artem S. Ulihin ◽  
Vladislav A. Sadykov
Keyword(s):  
Solid Electrolytes ◽  
Room Temperature ◽  
Complex Impedance ◽  
Impedance Method ◽  
Sintering Aids ◽  
Zirconia Ceramics ◽  
Operation Temperature ◽  
Cubic Structure ◽  
Xrd Patterns

AbstractSSZ-based ceramics were obtained by sintering of nanopowders derived at room temperature by mechanochemical synthesis from refined technical grade ZrO2 nano-precursors. RT-treatment by 2.5 MeV electrons up to 1563 K was used for the modification of ceramics. Powders and ceramics were characterized by XRD, Raman, SEM and EDS, TEM, SIMS techniques. The phase composition of Zr0.89Sc0.1Ce0.01O1.95 ceramics was very close to cubic structure but better fitting of XRD patterns was obtained for rhombohedral lattice. Conductivity of solid electrolytes for IT SOFC was studied by complex impedance method. To stabilize cubic structure and increase conductivity at operation temperature of To ∼ 1000 K, the composition of SSZ solid electrolyte was optimized by addition of yttria and sintering aids. The interaction of admixtures with minor dopants leading to intergrain phase was revealed. During fast sintering, ceramics keep a memory about inhomogeneous disordered solid solutions in a form of nanostructuring. Conductivity data indicate nanostructuring of ceramics too: activation energies of bulk and grain boundary conductivities are close (Eb ∼ 0.9 eV, Egb ∼ 1.05 eV). Annealing of ceramics at high temperatures increases conductivity at To and promotes grain growth.

A novel approach of an infrared transparent Er:Y2O3–MgO nanocomposite for eye-safe laser ceramics

2018 ◽  
Vol 6 (41) ◽  
pp. 11096-11103 ◽  
Author(s):  
Ho Jin Ma ◽  
Wook Ki Jung ◽  
Youngtae Park ◽  
Do Kyung Kim
Keyword(s):  
Photoluminescence Spectrum ◽  
Energy Levels ◽  
Laser Ceramics ◽  
Novel Approach

Photoluminescence spectrum and energy levels of an Er:Y2O3–MgO nanocomposite.

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