scholarly journals The effect of nano-TiO2 addition on the properties of mullite-zirconia composites prepared by slip casting

2012 ◽  
Vol 44 (3) ◽  
pp. 341-354 ◽  
Author(s):  
S.H. Badiee ◽  
S. Otroj ◽  
M. Rahmani
Keyword(s):  
Phase Composition ◽  
Flexural Strength ◽  
Physical Properties ◽  
Slip Casting ◽  
Reaction Sintering ◽  
Casting Method ◽  
Nano Tio2 ◽  
Zircon Powder ◽  
Zirconia Composites ◽  
Tio2 Addition

The mullite-zirconia composites were prepared by reaction-sintering of alumina and zircon powder. Besides, the slip casting method was employed for fabrication of these composites. Then, the effect of nano-TiO2 addition on the properties of these composites was investigated and the results were compared with micro-sized TiO2. Hence, the physical properties, phase composition, flexural strength and microstructure of these composites after firing at 1600?C were studied. The results showed that the flexural strength of composite tends to increase with the addition of 0.5 wt.% nano-TiO2. It is attributed to the formation of larger size rod-like ZrO2 and enhanced ceramic bonding between them.

Properties of Mullite-Zirconia Composites Prepared through Reaction Sintering Kaolin, α-Al2O3, and ZrO2

2010 ◽  
Vol 160-162 ◽  
pp. 1772-1778 ◽  
Author(s):  
F. Sahnoune ◽  
N. Saheb ◽  
P. Goeuriot
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Coefficient Of Thermal Expansion ◽  
Testing Machine ◽  
Tetragonal Zirconia ◽  
Quantitative Phase Analysis ◽  
Reaction Sintering ◽  
Zro2 Content ◽  
Linear Coefficient ◽  
Zirconia Composites

Mullite–zirconia composites were synthesized through reaction sintering Algerian kaolin, α-Al2O3, and ZrO2. Phases present and their transformations were characterized using x-ray diffraction. Quantitative phase analysis was performed following the Rietveld method. Hardness and fracture toughness were measured by Vickers indentation. The flexural strength was measured using a Universal Testing Machine. It was found that the microstructure of samples sintered for 2 hours at 1600°C was composed of mullite grains which have whiskers’ shape and ZrO2 particles. In the composite containing 16 wt.% ZrO2, the ratio of tetragonal zirconia transformed to monoclinic zirconia was relatively small and did not exceed 18%. However, in the composite containing 32 wt.% ZrO2 around 75% of the tetragonal structure changed to monoclinic structure. Also, it was found that the increase of ZrO2 content from 0 to 32 wt.% decreased the microhardness of the composites from 14 to 10.8 GPa. However, the increase of ZrO2 content from 0 to 24wt.% increased the flexural strength of the composites from 142 to 390 MPa then decreased it with further increase of ZrO2 content. The fracture toughness increased from 1.8 to 2.9 MPa.m1/2 with the increase of ZrO2 content from 0 to 32 wt.%; and the rate of the increase decreased at higher fractions of ZrO2 content. The average linear coefficient of thermal expansion (within the range 50 to 1450°C) for samples containing 0 and 16 wt.% ZrO2 sintered at 1600°C for 2 hours was 4.7 x10-6 K-1 and 5.2 x 10-6 K-1 respectively.

The Effects of Mineral Composition and Sintering Temperature on Synthetic Mullite

2014 ◽  
Vol 633 ◽  
pp. 65-68
Author(s):  
Lei Li ◽  
Xiao Guang Zhang ◽  
Rui Long Wen ◽  
Cheng Biao Wang ◽  
Ming Hao Fang ◽  
...  
Keyword(s):  
Phase Composition ◽  
Flexural Strength ◽  
Physical Properties ◽  
Energy Saving ◽  
Environmental Protection ◽  
Mineral Composition ◽  
Sintering Temperature ◽  
Final Phase ◽  
Mullite Phase ◽  
Industrial Alumina

Mullite material was prepared from quartz (SiO2) and industrial alumina (γ-Al2O3). The effects of mineral composition and sintering temperature on the final phase composition and physical properties of mullite were investigated. The results shown that a large number of mullite phase was emerged in samples when the ratio of alumina to silica (A/S) was 2.55. At 1500 oC and 1600 oC, the flexural strength of the samples reached to 87.13 MPa and 89.50 MPa, respectively. Consider the environmental protection and energy saving, the optimal sintering temperature was 1500 °C.

The Effect of Calcium Carbonate Added into Mambong Clay

2020 ◽  
Vol 1010 ◽  
pp. 256-261
Author(s):  
Nurul Ainon Bakar ◽  
Noruzaman Daud ◽  
Siti Mariam Mat Nor ◽  
Nik Maheran Nik Muhammad ◽  
Julie Juliewatty Mohamed
Keyword(s):  
Calcium Carbonate ◽  
Physical Properties ◽  
Clay Soil ◽  
Slip Casting ◽  
Fabrication Technique ◽  
Casting Method ◽  
Optimum Amount ◽  
Casting Technique ◽  
Materials Used ◽  
Microstructure Density

Mambong clay is a traditional pottery that originally from Kampong Mambong, Kuala Krai, Kelantan, Malaysia. The new fabrication technique of this pottery is the slip casting technique. However, the innovation of Mambong pottery does not only limited to the fabrication technique, but also the materials used in the fabrication in order to improve its physical properties. Calcium carbonate (CaCO3) is one of the materials that can be used in this fabrication as an additive due to the ability to stabilize the clay soil and improves the clay physical properties. In this study, the various CaCO3 contents (0, 5, 10, and 15%) were investigated to get the optimum amount of CaCO3 to improve the physical properties of Mambong clay by using slip casting method. Mambong clay with different amount of CaCO3 addition was compared in term of microstructure, density, porosity, shrinkage, and flexural strength.

The effect of colemanite addition on the properties of mullite-zirconia composites prepared by slip casting

2017 ◽  
Vol 1 (80) ◽  
pp. 5-10
Author(s):  
H. Aydin ◽  
R. Ceylantekin ◽  
G. Tokataş
Keyword(s):  
Production Technology ◽  
Raw Materials ◽  
Slip Casting ◽  
Reaction Sintering ◽  
Sintering Process ◽  
Good Resistance ◽  
Powder Composition ◽  
Chemical Attack ◽  
Zirconia Composites ◽  
Metallic Melts

Purpose: This study deals with the effects of colemanite (Ca2B6O115H2O) on properties ofslip-cast mullite–zirconia composites prepared via reaction–sintering of kaolinite, aluminaand zircon powders.Design/methodology/approach: Colloidal processing (slip casting) is the routetowards preparing these materials using 45 vol.% aqueous suspensions of a mixture offine powders stabilized with polyacrylate solution as a dispersant.Findings: The influence of powder composition on physical, mineralogical properties, andmicrostructure of these composites after firing at 1450, 1500 and 1550°C are observed.The results show that the density of composites tends to increase with the addition of7 wt.% colemanite. XRD analyses reveal that using colemanite during the synthesis ofmullite-zirconia composites lowers the reaction temperature. All of the composites consistof irregularly shaped mullite and round-shaped zirconia grains, which are distributedhomogenously.Practical implications: Mullite–zirconia composites, owing to their chemical inertnessand good resistance against chemical attack-corrosion by siliceous and metallic melts, theyare employed in the glass industry.Originality/value: Reaction sintering process is considered as a promising technology forpreparing mullite-zirconia composites, because it has some advantages such as low costof traditional raw materials, straightforward production technology and low manufacturingcost.

Preparation of Bimodal Porous Apatite Ceramics through Slip Casting Using Fine Hydroxyapatite Powders

2006 ◽  
Vol 317-318 ◽  
pp. 723-728 ◽  
Author(s):  
Yin Zhang ◽  
Yoshiyuki Yokogawa ◽  
Tetsuya Kameyama
Keyword(s):  
Flexural Strength ◽  
Size Range ◽  
Slip Casting ◽  
Fine Powder ◽  
Total Porosity ◽  
Solid Loading ◽  
Wet Milling ◽  
Hydrogen Phosphate ◽  
Optimum Amount ◽  
Porous Hydroxyapatite

A bimodal porous hydroxyapatite (HAp) body with high flexural strength was prepared through slip casting. HAp fine powder used in this study was synthesized by wet milling, drying and heating of a mixture of calcium hydrogen phosphate di-hydrate and calcium carbonate. The synthesized HAp powder was 0.320.05 μm in size and 38.10.8m2/g in specific surface area. The slip was prepared by adding deflocculant and foaming reagent. The optimum value for the minimum viscosity in the present HAp slip with respect to its solid loading and the optimum amount of the deflocculant were studied. The total porosity of the specimens obtained from a slip of 48 wt% HAp solid loading is in the range of 49 – 61vol %, and the resultant porous HAp sintered body had large spherical pores of 300 -m with interconnecting rectangular voids. Many small pores in the size range of 2-3 -m or below were observed in the specimen obtained by heating at 1100, and 1200 . The flexural strength of the bimodal porous HAp ceramics sintered at 1200 C showed a large value of 17.6 MPa, with a porosity of 60.5vol.

scholarly journals Effect of Palm Stearin binder to the Mechanical Properties of Alumina using Slip Casting Method

2020 ◽  
Vol 834 ◽  
pp. 012059
Author(s):  
M N Halmy ◽  
S K Alias ◽  
M A Mat Shah ◽  
M K Maryam ◽  
M A Abu Bakar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Slip Casting ◽  
Palm Stearin ◽  
Casting Method
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