Pressureless sintering of alumina matrix ceramic materials improved by Al–Ti–B master alloys and diopside

The MgTiO3 and CaTiO3 powders were synthesized by solid reaction method, and MgTiO3-CaTiO3 ceramic was prepared using pressureless sintering method. The experiment prepared MgTiO3-CaTiO3 ceramics with high compactness and stable permittivity by the way of changing the mole ratio of MgTiO3 and CaTiO3 to investigate the effect of CaTiO3 on the performances of MgTiO3-CaTiO3 ceramics. The results show that Mg2TiO4 formed as second phase during sintering. Volume density and dielectric constant of MgTiO3-CaTiO3 ceramics with 10%mol CaTiO3 reach maximum of 3.612g/cm3 and 17.8, respectively, under 1460°C sintering temperature. And for the MgTiO3-CaTiO3 ceramics with 5%mol CaTiO3 the maximum values which are 3.5g/cm3 and 16.6, respectively, appear under 1510°C sintering temperature.

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Preparation of the System of BaO-MgO-Al2O3-TiO2 Acid-Resistant Fracturing Proppants

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.399-401.855 ◽

2011 ◽

Vol 399-401 ◽

pp. 855-859

Author(s):

Ting Ting Wu ◽

Bo Lin Wu

Keyword(s):

Sintering Temperature ◽

Raw Materials ◽

Acid Resistance ◽

Pressureless Sintering ◽

Alumina Matrix ◽

X Ray Diffraction ◽

X Ray ◽

Acid Solubility ◽

Resistance Performance ◽

Scanning Electron

In order to improve the acid resistance and reduce the apparent density of fracturing proppants, TiO2 powder added in the system of BaO-MgO-Al2O3 fracturing proppants were prepared by the technique of pressureless sintering. The properties of the samples were investigated by the measurements of acid solubility, X-ray diffraction and scanning electron microscopy. The results show that the acid solubility of alumina matrix fracturing proppants contenting TiO2 of the 4wt% and BaO/MgO with the ratio of 3:7 is 0.15%. It is an important development in acid resistance performance of fracturing proppants research on laboratory. TiO2 is added to the raw materials and then calcine them to ceramics, which can reduces the sintering temperature, promote the densification and improve acid-resistant property of fracturing proppants.

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Addition of rare earth and diopside to improve performances of alumina matrix ceramic materials

Materials Research Innovations ◽

10.1179/1433075x12y.0000000075 ◽

2013 ◽

Vol 17 (4) ◽

pp. 293-297 ◽

Cited By ~ 4

Author(s):

C. X. Liu ◽

J. L. Sun ◽

M. H. Yao

Keyword(s):

Rare Earth ◽

Ceramic Materials ◽

Alumina Matrix

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Tribological properties of pressureless sintered advanced alumina matrix ceramic materials improved by Al–Ti–B and diopside

Wear ◽

10.1016/j.wear.2007.10.016 ◽

2008 ◽

Vol 265 (3-4) ◽

pp. 286-291 ◽

Cited By ~ 1

Author(s):

Changxia Liu ◽

Jianhua Zhang ◽

Junlong Sun ◽

Xihua Zhang

Keyword(s):

Tribological Properties ◽

Ceramic Materials ◽

Alumina Matrix

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Sintering Study of Al2O3/NbC/Wc Micro-Nanocomposite

Materials Science Forum ◽

10.4028/www.scientific.net/msf.727-728.597 ◽

2012 ◽

Vol 727-728 ◽

pp. 597-602 ◽

Cited By ~ 2

Author(s):

Vania Trombini ◽

Karolina Pereira Santos Tonello ◽

Thais Santos ◽

José Carlos Bressiani ◽

Ana Helena de Almeida Bressiani

Keyword(s):

Mechanical Properties ◽

Mechanical Strength ◽

Heating Rate ◽

Cutting Tools ◽

Ceramic Materials ◽

Simultaneous Increase ◽

Sintering Behavior ◽

Alumina Matrix ◽

Hard Metals ◽

Nanometric Particles

Ceramic materials based on alumina are considered excellent for produce cutting tools used to machining hard metals. However, low mechanical strength and toughness presented by these materials limit their application. Traditionally particles, such as TiC, TiN and ZrO2, are added to the alumina matrix to improve their mechanical properties, increasing the range of applications. Recent studies have shown that the addition of particles of different sizes in alumina matrix can promote simultaneous increase in mechanical strength and tenacity. In this work sintering behavior of Al2O3micro-nanocomposite containing nanometric particles of NbC and micrometric particles of WC, was studied by dilatometry using heating rate of 20°C/min up to 1800°C. The addition of carbides in alumina matrix is prejudicial to sintering causing an increase in temperature of shrinkage.

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