Compaction and grain growth in alumina ceramics under microwave sintering

1997 ◽  
Vol 36 (7-8) ◽  
pp. 359-363 ◽  
Author(s):  
V. V. Panichkina ◽  
E. A. Shevchenko ◽  
Yu. V. Bykov ◽  
A. G. Eremeev
Keyword(s):  
Grain Growth ◽  
Microwave Sintering ◽  
Alumina Ceramics

Densification kinetics of Alumina During Microwave Sintering

1992 ◽  
Vol 269 ◽  
Author(s):  
Jiping Cheng ◽  
Jinyu Qiu ◽  
Jian Zhou ◽  
Neng Ye
Keyword(s):  
High Temperature ◽  
Grain Growth ◽  
Microwave Field ◽  
Microwave Sintering ◽  
Alumina Ceramics ◽  
Kinetics Parameters ◽  
Fine Grained ◽  
Prolonged Time ◽  
Conventional Sintering ◽  
Kinetics Of

ABSTRACTSome kinetics parameters of alumina during microwave sintering were studied and compared with that during conventional sintering. The results demonstrated that the sintering rates for microwave processing were much greater than that for conventional processing, and the grain growth of alumina was rapid with prolonged time at high temperature in a microwave field. It was indicated that the microwave sintering at higher temperatures for a shorter time was favorable for preparing high density and fine-grained alumina ceramics.

Microwave Processing of Silicon Nitride

1990 ◽  
Vol 189 ◽  
Author(s):  
T. N. Tiegs ◽  
J. O. Kiggans ◽  
H. D. Kimrey
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Microwave Heating ◽  
Grain Growth ◽  
Microwave Power ◽  
Microwave Sintering ◽  
Microwave Processing ◽  
Microwave Furnace

ABSTRACTMicrowave sintering of Si3N4—based materials showed improved densification as compared to samples heated conventionally under similar conditions. Accelerated nitridation of Si in the microwave furnace to produce Si3N4 was also observed. Dense Si3N4, annealed by microwave heating, exhibited enhanced grain growth; however preferential coupling of the microwave power to the grain—boundary phases in the present experiments resulted in their degradation.

scholarly journals Investigation of the mechanism(s) controlling microwave sintering of α-alumina: Influence of the powder parameters on the grain growth, thermodynamics and densification kinetics

2015 ◽  
Vol 35 (3) ◽  
pp. 959-970 ◽  
Author(s):  
Fei Zuo ◽  
Sébastien Saunier ◽  
Sylvain Marinel ◽  
Pauline Chanin-Lambert ◽  
Nathalie Peillon ◽  
...  
Keyword(s):  
Grain Growth ◽  
Microwave Sintering

Densification and grain growth during microwave sintering of titanium diboride

2013 ◽  
Vol 69 (8) ◽  
pp. 610-613 ◽  
Author(s):  
D. Demirskyi ◽  
J. Cheng ◽  
D. Agrawal ◽  
A. Ragulya
Keyword(s):  
Grain Growth ◽  
Titanium Diboride ◽  
Microwave Sintering

Nanostructure Evolution of ZnO in Ultra-fast Microwave Sintering

2011 ◽  
Vol 691 ◽  
pp. 65-71 ◽  
Author(s):  
Rodolfo F. K. Gunnewiek ◽  
Ruth Herta Goldsmith Aliaga Kiminami
Keyword(s):  
Grain Size ◽  
Zinc Oxide ◽  
Grain Growth ◽  
Microwave Sintering ◽  
High Heating Rate ◽  
Heating Rates ◽  
Grain Sizes ◽  
Average Grain Size ◽  
Conventional Sintering ◽  
Holding Temperature

Grain growth is inevitable in the sintering of pure nanopowder zinc oxide. Sintering depend on diffusion kinetics, thus this growth could be controlled by ultra-fast sintering techniques, as microwave sintering. The purpose of this work was to investigate the nanostructural evolution of zinc oxide nanopowder compacts (average grain size of 80 nm) subjected to ultra-rapid microwave sintering at a constant holding temperature of 900°C, applying different heating rates and temperature holding times. Fine dense microstructures were obtained, with controlled grain growth (grain size from 200 to 450nm at high heating rate) when compared to those obtained by conventional sintering (grain size around 1.13µm), which leads to excessively large average final grain sizes.

Microwave Sintered Porous Mullite Composite

2012 ◽  
Vol 512-515 ◽  
pp. 382-385
Author(s):  
Xu Qin Li ◽  
Xin Zhang ◽  
Rui Zhang ◽  
Bing Bing Fan
Keyword(s):  
Grain Growth ◽  
Microwave Plasma ◽  
Microwave Sintering ◽  
Xrd Analysis ◽  
High Energy ◽  
Volume Density ◽  
X Ray Diffraction ◽  
Porous Mullite ◽  
Lower Temperature ◽  
Porosity Detection

In order to aviod much high energy and CO2 generation. Microwave sintering (MS) is always carried out to prepare refractory. In this work，MS was proposed to sinter mullite composite. An insulation structure based on hybrid heating mode was well designed with the wall of high-aluminum refractory and the aided heaters of SiC. The sintered samples under different sintering processing were characterized by appearent porosity detection and volume density. Phase composition was investigated by X-ray Diffraction (XRD) analysis. Surface and fracture Flied Emission Scanning Electron Microscopy (FESEM) was applied to observe pore distribution and grain growth. Sintering profile was provided in this work. It was found that mullite composite could be prepared within 1h at relative lower temperature around 1300°C. Compared with samples prepared by convitional sintering (CS), MS samples presented better densification and more uniform grain growth. Microwave plasma phenomena was explored inside MS samples, however, not found in CS ones.

Elongated Grain Growth Mechanism of Alumina Ceramics with Additives

2010 ◽  
Vol 105-106 ◽  
pp. 844-847
Author(s):  
Yong Chang Zhu ◽  
Shou Fan Rong ◽  
Ji Wei Guo ◽  
Jun Gang Li
Keyword(s):  
Grain Growth ◽  
Growth Mechanism ◽  
Second Phase ◽  
Pressureless Sintering ◽  
Sintering Process ◽  
Alumina Ceramics ◽  
Effect Of Additives ◽  
Sintering Properties ◽  
Columnar Grain

The elongated grain evolution of alumina ceramics doping with Al2O3-CaO-SiO2(CAS), Nb2O5, and 3Y-TZP was studied under pressureless sintering. From in-situ growth elongated grain cooperating with second phase to toughen the alumina ceramics, microstructure and sintering properties were firstly studied systematically. The effect of additives on the alumina ceramics with columnar grain were analyzed by means of TEM, SEM, XRD, etc. Basing on the analyzed sintering process by the principle of dynamics, the elongated grain growth mechanism was further studied.

scholarly journals Superplastic Alumina Ceramics with Grain Growth Inhibitors

1991 ◽  
Vol 74 (4) ◽  
pp. 842-845 ◽  
Author(s):  
Liang A. Xue ◽  
Xin Wu ◽  
I-Wei Chen
Keyword(s):  
Grain Growth ◽  
Growth Inhibitors ◽  
Alumina Ceramics
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