scholarly journals Influence of granule characteristics on fabrication of translucent alumina ceramics with high strength and reliability

2016 ◽  
Vol 124 (4) ◽  
pp. 426-431 ◽  
Author(s):  
Satoshi TANAKA ◽  
Shota GOI ◽  
Zenji KATO
Keyword(s):  
High Strength ◽  
Alumina Ceramics

A method for gelcasting high-strength alumina ceramics with low shrinkage

2014 ◽  
Vol 29 (2) ◽  
pp. 247-251 ◽  
Author(s):  
Yi Sun ◽  
Shunzo Shimai ◽  
Xiang Peng ◽  
Manjiang Dong ◽  
Hidehiro Kamiya ◽  
...  
Keyword(s):  
High Strength ◽  
Alumina Ceramics ◽  
Image Position

Abstract

High-strength macro-porous alumina ceramics with regularly arranged pores produced by gel-casting and sacrificial template methods

2019 ◽  
Vol 54 (14) ◽  
pp. 10119-10129 ◽  
Author(s):  
Mengwen Zhang ◽  
Xiaodong Li ◽  
Mu Zhang ◽  
Zhimeng Xiu ◽  
Ji-Guang Li ◽  
...  
Keyword(s):  
Porous Alumina ◽  
High Strength ◽  
Alumina Ceramics ◽  
Sacrificial Template ◽  
Gel Casting ◽  
Template Methods

Fabrication of Porous Alumina Ceramics by Spark Plasma Sintering Method

2007 ◽  
Vol 26-28 ◽  
pp. 279-282
Author(s):  
Dae Ho Choi ◽  
Kai Kamada ◽  
Naoya Enomoto ◽  
Junichi Hojo ◽  
Soo Wohn Lee
Keyword(s):  
Carbon Black ◽  
Porous Alumina ◽  
High Strength ◽  
Alumina Ceramics ◽  
Carbon Black Content ◽  
Pore Characteristics ◽  
Carbon Black Powder ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Method

In this work, porous alumina ceramics were obtained by controlled sintering of alumina-carbon black powder mixtures. In order to develop the porous alumina ceramics with high strength, as the amount of carbon black increased, the number of small pores increased because the pore characteristics and relative density the influence of SPS condition and carbon black content on was studied.

Effect of Sintering Temperature on the Densification Mechanism of Al2O3-Al Metal Ceramics via the Powder Metallurgy Method

2018 ◽  
Vol 279 ◽  
pp. 104-108 ◽  
Author(s):  
Jie Guang Song ◽  
Lin Chen ◽  
Yun Xiang ◽  
Yue Liu ◽  
Xin Shuang Guo ◽  
...  
Keyword(s):  
Mass Fraction ◽  
Sintering Temperature ◽  
Mixing Time ◽  
Performance Testing ◽  
High Strength ◽  
Ceramic Materials ◽  
Powder Metallurgy Method ◽  
High Plasticity ◽  
Alumina Ceramics ◽  
Densification Mechanism

Alumina ceramics with good mechanical and corrosion resistance are the ones of the most widely used engineering ceramics. The aluminum has high strength, high conductivity and high plasticity etc. so that aluminum ceramics are used in more and more industries. In this paper, the mass fraction of 25% Al2O3 powder and the mass fraction of 75% Al powder were mixed in the blender. Mixer speed is100r/min with mixing time of 3.5 h. Forming, sintering and a series of processes for preparing the alumina/aluminum metallic ceramic materials, through performance testing and analysis, found that the density of the sample firstly increased and then decreased with the increase of sintering temperature. A melting point is close to the sintering temperature and the density of the cermet can be made relatively high. When the sintering temperature is about 600°C and 700°C, the macro performance of sample is better. The cermet is sintered at 700°C and its microstructure is relatively better.

Effect of Alumina Ceramics Slurry Polymerization Reaction Factor

2012 ◽  
Vol 182-183 ◽  
pp. 270-273
Author(s):  
Zhan Xin Zhang ◽  
Hong Kui Hu ◽  
Hui Feng Bo
Keyword(s):  
Ph Value ◽  
High Strength ◽  
Polymerization Reaction ◽  
Alumina Ceramics ◽  
Factors Affecting ◽  
Ceramic Slurry ◽  
Specific Parameter ◽  
Performance Effects ◽  
Reaction Factor ◽  
Parameter Values

the properties of the alumina ceramics depends directly on the ceramic slurry performance, effects of slurry polymerization of many factors, mainly including the slurry pH value, temperature, initiator. This paper focuses on the study of the factors affecting the performance of slurry, received a specific parameter values, so as to prepare the blank has high strength over 78MPa, density distribution and contraction of uniform body.

Alumina Ceramics via Gelcasting Forming with Low-Toxicity System

2012 ◽  
Vol 452-453 ◽  
pp. 35-40 ◽  
Author(s):  
Yue Min Wang ◽  
Jun Liu ◽  
Chao Wang ◽  
Ling Juan Fei ◽  
Ya Wei Han ◽  
...  
Keyword(s):  
Compressive Strength ◽  
High Strength ◽  
Solid Content ◽  
Experimental Results ◽  
Shrinkage Rate ◽  
Green Body ◽  
Alumina Ceramics ◽  
Ceramic Powders ◽  
Polymeric Networks ◽  
Low Toxicity

The gelcasting technique was used to fabricate 95 alumina ceramics green bodies. The gel system based on MAM-MBAM was low-toxicity in this study. The green bodies and the sinter obtained with solid content of 55vol% had high strength, density and quality. The influences of the monomers mole ratio (MAM/MBAM) and the monomers content (MAM and MBAM) on the compressive strength of green bodies, the solid content on the density, compressive strength and the shrinkage rate of green bodies were also discussed. The experimental results showed that the best mole ratio of MAM/MBAM was 12/1. Compressive strength increased with the increase of monomers content (MAM and MBAM). The microstructure of the green bodies indicated that the ceramic powders were connected by polymeric networks, and the ceramic powders in the green body distributed homogeneously and compactly.

scholarly journals High-strength porous alumina ceramics prepared from stable wet foams

2021 ◽  
Author(s):  
Linying Wang ◽  
Liqiong An ◽  
Jin Zhao ◽  
Shunzo Shimai ◽  
Xiaojian Mao ◽  
...  
Keyword(s):  
Heat Insulation ◽  
Porous Alumina ◽  
High Strength ◽  
Porous Ceramics ◽  
High Porosity ◽  
Alumina Ceramics ◽  
Direct Foaming ◽  
Catalyst Carrier ◽  
Average Grain Size ◽  
Direct Foaming Method

AbstractPorous ceramics have been widely used in heat insulation, filtration, and as a catalyst carrier. Ceramics with high porosity and high strength are desired; however, this high porosity commonly results in low strength materials. In this study, porous alumina with high porosity and high strength was prepared by a popular direct foaming method based on particle-stabilized wet foam that used ammonium polyacrylate (PAA) and dodecyl trimethyl ammonium chloride (DTAC) as the dispersant and hydrophobic modifier, respectively. The effects of the dispersant and surfactant contents on the rheological properties of alumina slurries, stability of wet foams, and microstructure and mechanical properties of sintered ceramics were investigated. The microstructure of porous ceramics was regulated using wet foams to achieve high strength. For a given PAA content, the wet foams exhibited increasing stability with increasing DTAC content. The most stable wet foam was successfully obtained with 0.40 wt% PAA and 0.02 wt% DTAC. The corresponding porous alumina ceramics had a porosity of 82%, an average grain size of 0.7 µm, and a compressive strength of 39 MPa. However, for a given DTAC content, the wet foams had decreasing stability with increasing PAA content. A possible mechanism to explain these results is analyzed.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

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