Salient features of SrO doping in Al2O3 – 5 wt.% ZrO2 reaction sintered composite ceramics

2020 ◽  
Vol 829 ◽  
pp. 154559 ◽  
Author(s):  
Shaik Akbar Basha ◽  
K. Sarath Chandra ◽  
Debasish Sarkar
Keyword(s):  
Composite Ceramics ◽  
Sintered Composite ◽  
Salient Features

In Situ Synthesis and Mechanical Properties of TiN-Si2N2O-Si3N4 Composites

2008 ◽  
Vol 403 ◽  
pp. 227-230
Author(s):  
Hajime Kiyono ◽  
Shiro Shimada
Keyword(s):  
Bending Test ◽  
Vickers Indentation ◽  
Composite Ceramics ◽  
Indentation Method ◽  
Amorphous Sio2 ◽  
Mixed Powder ◽  
Sintered Composite ◽  
Four Point Bending ◽  
Four Point Bending Test

Si3N4-Si2N2O-TiN composite ceramics were in-situ fabricated by using following reactions of (1) 3TiO2 + Si3N4 → 3TiN + 3SiO2 + N2 and (2) Si3N4+ SiO2 → 2Si2N2O. The mixed powder of α-Si3N4, Al2O3, Y2O3 and TiO2 was hot-pressed at 24 MPa and 1800°-1900°C for 1-4 h in N2. Sintered composite ceramics were characterized by XRD, SEM, TEM, four-point bending test and Vickers indentation method. XRD results and TEM observation showed that TiN and amorphous SiO2 were formed at 1250°C by the reaction (1), and the Si2N2O phase formed by reaction (2) above 1800°C. Si3N4-Si2N2O-TiN composites consisted of ≥2 m sized Si2N2O grains with TiN and Si3N4 grains. Hardness and fracture strength of the composites were comparable to those of Si2N2O ceramics, with fracture toughness being improved at 5vol% TiN containing composites.

Preparation and Properties of BN-SiO2 Composite Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 1426-1428 ◽  
Author(s):  
Hua Zhang Zhai ◽  
Hong Nian Cai ◽  
Xiao Zhan Yang ◽  
Jian Bao Li ◽  
Gang Feng Guo ◽  
...  
Keyword(s):  
Hexagonal Boron Nitride ◽  
Secondary Phase ◽  
Silica Content ◽  
Silica Sol ◽  
Composite Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sintered Composite ◽  
Boron Nitride Powder ◽  
Scanning Electron

A series of BN-SiO2 composite ceramics with high relative densities have been fabricated by hot pressing of a mixture of hexagonal boron nitride powder and silica sol. X-ray diffraction (XRD) results show that silica are distributed in the BN matrix as noncrystalline state. Microstructure of as-sintered composite ceramics is observed by scanning electron microscopy (SEM). The influence of the secondary phase on the mechanical properties is studied by varying the silica content from 10 wt% up to 40 wt%. Dielectric properties of composite ceramics are also measured from 1 MHz to 2.0 GHz.

Pressureless densification and properties of TiB 2 –B 4 C composite ceramics with Ni as additives

2018 ◽  
Vol 13 (7) ◽  
pp. 947-950 ◽  
Author(s):  
Li Ma ◽  
Jincheng Yu ◽  
Xue Guo ◽  
Yujun Zhang ◽  
Hongyu Gong
Keyword(s):  
Composite Ceramics

Metastable Defects in the Amorphous Silicon-Germanium Alloys

2003 ◽  
Vol 762 ◽  
Author(s):  
J. David Cohen
Keyword(s):  
Amorphous Silicon ◽  
Silicon Germanium ◽  
Dangling Bonds ◽  
Annealing Behavior ◽  
Fundamental Properties ◽  
Silicon Materials ◽  
Salient Features ◽  
The Individual ◽  
Amorphous Silicon Germanium ◽  
Silicon Germanium Alloys

AbstractThis paper first briefly reviews a few of the early studies that established some of the salient features of light-induced degradation in a-Si,Ge:H. In particular, I discuss the fact that both Si and Ge metastable dangling bonds are involved. I then review some of the recent studies carried out by members of my laboratory concerning the details of degradation in the low Ge fraction alloys utilizing the modulated photocurrent method to monitor the individual changes in the Si and Ge deep defects. By relating the metastable creation and annealing behavior of these two types of defects, new insights into the fundamental properties of metastable defects have been obtained for amorphous silicon materials in general. I will conclude with a brief discussion of the microscopic mechanisms that may be responsible.

Effect of Al2O3 Addition on Magnetoelectric Properties of Ni0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 Composite Ceramics

2021 ◽  
Vol 50 (5) ◽  
pp. 2822-2830
Author(s):  
Xiaofeng Qin ◽  
Chuang Zhou ◽  
Heng Wu ◽  
Li Cheng ◽  
Tao fan ◽  
...  
Keyword(s):  
Composite Ceramics ◽  
Al2o3 Addition ◽  
Magnetoelectric Properties

scholarly journals Remarkable plasma-resistance performance by nanocrystalline Y2O3·MgO composite ceramics for semiconductor industry applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hyeon-Myeong Oh ◽  
Young-Jo Park ◽  
Ha-Neul Kim ◽  
Kundan Kumar ◽  
Jae-Woong Ko ◽  
...  
Keyword(s):  
Plasma Etching ◽  
Semiconductor Industry ◽  
High Plasma ◽  
Hot Press ◽  
Composite Ceramics ◽  
Plasma Resistance ◽  
Industry Applications ◽  
Hot Press Sintering ◽  
Resistance Performance ◽  
First Time

AbstractMotivated by recent finding of crystallographic-orientation-dependent etching behavior of sintered ceramics, the plasma resistance of nanocrystalline Y2O3-MgO composite ceramics (YM) was evaluated for the first time. We report a remarkably high plasma etching resistance of nanostructure YM surpassing the plasma resistance of commercially used transparent Y2O3 and MgAl2O4 ceramics. The pore-free YM ceramic with grain sizes of several hundred nm was fabricated by hot press sintering, enabling theoretical maximum densification at low temperature. The insoluble two components effectively suppressed the grain growth by mutual pinning. The engineering implication of the developed YM nanocomposite imparts enhanced mechanical reliability, better cost effectiveness with excellent plasma resistance property over their counterparts in plasma using semiconductor applications.

Sign in / Sign up

Export Citation Format

Share Document