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Research on Preparation Process of Aqueous Alumina Paste

Author: FengJianWei
Tutor: LiuHongJunï¼›CaoChi
School: Lanzhou University of Technology
Course: Materials Engineering
Keywords: Paste Extrusion Alumina Dispersion Slurry
CLC: TQ174.1
Type: Master's thesis
Year: 2011
Downloads: 36
Quote: 0
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Abstract


With the development of modern science and technology and high-performance structural ceramic materials widely used in various industries for reliability and controllability of the ceramic material put forward higher requirements, this presents a challenge to the existing ceramic molding. From the ceramic research perspective of the development of nearly half a century, the ceramic research focus has experienced from sintered powder molding technology until recently. Ceramic paste extrusion is a rapid prototyping manufacturing technology and the premise of the molding method must be prepared by a high solid content, good rheology paste. Therefore, this article by factors of process parameters on the the alumina slurry dispersion and rheological properties of paste, so as to provide a theoretical basis and data support the application of alumina paste. The full text of the main work is as follows: 1) the effect of different solid content, type and the added amount of dispersant (KH, NH4-citrate, PAM), pH value and the milling time on the slurry dispersion studies slurry the viscosity increases with increasing solid content, the viscosity of the slurry increases exponentially when the solid content is greater than 51vol%; first increases and then decreases with the increase of pH; with the amount of dispersant and the increase of milling time decreases and then increases. When the solid content to 50 vol%, pH = 9 the the KH or NH4-citrate 0.4vol% or equal to 0.5 vol%, 12h milling time low viscosity, good dispersion slurry. 2) was prepared by adjusting the pH value of the slurry of alumina paste used in extrusion molding, the experimental results show that in the case of the type of solid phase content, pH and KH added in an amount of paste rheology performance Bingham type fluid. And discussed the solid content, the type of dispersant and the added amount (KH, NH4-citrate, PAM), the influence of pH on paste rheology, studies paste viscosity increases with increasing solid content, with the pH value increases first and then decreases; with the increase of the amount of dispersant first decreases and then increases. And properly prepared solid phase content for the 50 vol%, KH added in an amount of 0.4vol, pH = 7 (NH4-citrate Add 0.5vol%, pH = 5), the dispersion and the rheology preferably alumina ceramic paste. 3) study the impact of the solid phase content of the body density, shrinkage, flexural strength. Forming a better blank, the relative density was 82.7%, the linear shrinkage rate of 2.3%, the flexural strength as 20MPa. Blank microscopic structure analysis, the analysis of the structure showed that the preform body particles evenly distributed, the gap is relatively small, microscopic good performance, reducing the number of large pores and to improve the distribution of the pores.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Basic theory
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