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Influence of stearic acid on the structure and rheological behavior of injection-molded ZTA suspensions

100%

Lin C. , Wang B. , Cheng Y. , Wang C.

Materials Science Poland

2013

tom Vol. 31, No. 1

36-42

The zirconia-toughened-alumina (ZTA) composite powder was exposed to a prior ball milling treatment with a small amount of stearic acid (SA) before the traditional blending process. The effect of different amounts of stearic acid on surface properties of the powder, the particle size distribution of the powder, and the rheological properties of the suspension were systematically studied within the design of experiments. Fourier transformation infrared spectroscopy (FTIR) analysis was used to prove the chemical interaction between the stearic acid and the ZTA powder. The effects of SA content on the particle sizes and their distribution were carefully examined. Rheological properties such as viscosity, yield stress, and power law exponent of the suspensions were determined within a temperature range of 140-170 °C. The optimal content of SA to improve the properties of the suspensions was found to be 3 wt.%.

Application of Ceramic Injection Moulding and Pressure Infiltration to the Manufacturing of Alumina/AlSi10Mg Composites

88%

Matula G. , Krzysteczko-Witek J. , Tomiczek B.

Archives of Metallurgy and Materials

2018

tom Vol. 63, iss. 4

2101--2106

Ceramic injection moulding and gas pressure infiltration were employed for the manufacturing of alumina/AlSi10Mg composites. Porous ceramic preforms were prepared by mixing alumina powder with a multi-binder system and injection moulding of the powder polymer slurry. Then, the organic part was removed through a combination of solvent and thermal debinding, and the materials were finally sintered at different temperatures. The ceramic preforms manufactured in this way were infiltrated by an AlSi10Mg alloy. The microstructure and properties of the manufactured materials were examined using scanning electron microscopy, mercury porosimetry and bending strength testing. The results of transmission electron microscopy and scanning electron microscopy observations show that the fabricated composite materials are characterised by the percolation type of the microstructure and a lack of unfilled pores with good cohesion at the metal-ceramic interfaces. This is surprising considering that over 30% of the pores are smaller than 1 μm. The results show that the bending strength of the obtained composites decreased with increasing sintering temperature of the porous preforms.

Application of Ceramic Injection Moulding and Pressure Infiltration to the Manufacturing of Alumina/AlSi10Mg Composites

75%

Matula G.