Influence of Technological Parameters on Thermal Properties of Cordierite Ceramics

2018 ◽  
Vol 762 ◽  
pp. 300-305
Author(s):  
Maris Rundans ◽  
Gaida Sedmale ◽  
Aija Krūmiņa ◽  
Aiga Ivdre
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Sintering Temperature ◽  
Phase Content ◽  
Technological Parameters ◽  
Cordierite Ceramic ◽  
Ceramic Samples ◽  
Cordierite Ceramics ◽  
Porous Cordierite

Porous cordierite ceramic samples have been prepared by using 33% of two carbonate-containing illite clays as substitutes for the necessary synthetic ingredients. The changes of thermal (CTE) and mechanical properties (compressive strength, modulus of elasticity), as well as phase content, apparent porosity and bulk density have been investigated in regards to gradual changes in maximum sintering temperature. It can be affirmed that these properties strongly depend on the thermal parameters of sintering as well as slightly upon differences in chemical composition of composition substitutes.

Modification of Porous Cordierite Ceramic

2016 ◽  
Vol 721 ◽  
pp. 322-326
Author(s):  
Ruta Švinka ◽  
Visvaldis Svinka ◽  
Julija Bobrovik
Keyword(s):  
Compressive Strength ◽  
Thermal Expansion ◽  
Large Scale ◽  
Sintering Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Slip Casting ◽  
Concentrated Suspension ◽  
Cordierite Ceramic ◽  
Silica Additive ◽  
Porous Cordierite

Highly porous cordierite ceramic by using of talcum, kaolinite and γ-alumina was obtained by method of slip casting of concentrated suspension. Additives of amorphous silica and non-stabilized zirconia in the amount of 5 wt% were used. Sintering temperature of dried samples was in range of 1250 – 1450°C. All the samples contain crystalline phases of cordierite, mullite and corundum but, depending on the additives, as a result of sintering in addition forms spinel, cristobalite or zircon (ZrSiO4). Porosity of obtained materials changes in large scale from 42 to 59 per cent; it is influenced by both sintering temperature and composition. Compressive strength increases with the addition of zirconia. In comparison, compressive strength of samples without additives or with silica additive does not exceed 3.5 MPa. The increase of coefficient of thermal expansion depends both on the composition and sintering temperature. ZrO2 additive increases the coefficient of thermal expansion considerably.

Development of Cordierite Ceramics from Natural Raw Materials

2014 ◽  
Vol 89 ◽  
pp. 94-99
Author(s):  
Maris Rundans ◽  
Gaida Sedmale ◽  
Ingunda Sperberga ◽  
Ina Pundiene
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Sintering Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Raw Materials ◽  
Thermal And Mechanical Properties ◽  
Dense Ceramic ◽  
Pore Glass ◽  
Materials Used ◽  
Cordierite Ceramics

Cordierite ceramics are known for their low CTE and high compressive strength values which affords them place in fields where demanding thermal and mechanical properties are required. Development of such ceramics is greatly dependent on materials used. If raw materials are used formation of additional phases and pore/glass formation is expected. The purpose of this research is to examine the process of cordierite development from mixed compositions formed from precursors of the natural raw materials as illite clay, dolomite and quartz sand and synthetic additives – MgO, γ-Al2O3 and their influence on thermal and mechanical properties. It is verified that the addition of 10 wt.% of illite clay and about 20-21 wt.% dolomite in staring compositions at the sintering temperature of 1200 °C results in the development of dense ceramic material with perfect-shaped crystalline cordierite phase and secondary anorthite phase. Sintered cordierite ceramics have been tested, among other properties, for their compressive strength, coefficient of thermal expansion and modulus of elasticity after 20 cycles of thermal shock treatment.

Effects of oil shale addition and sintering cycle on the microstructure and mechanical properties of porous cordierite-ceramic

2014 ◽  
Vol 40 (7) ◽  
pp. 8937-8944 ◽  
Author(s):  
A. Benhammou ◽  
Y. El Hafiane ◽  
A. Abourriche ◽  
Y. Abouliatim ◽  
L. Nibou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oil Shale ◽  
Cordierite Ceramic ◽  
Microstructure And Mechanical Properties ◽  
Porous Cordierite

scholarly journals Influence of Mullite Wool Waste on the Properties of Ceramics

1970 ◽  
Vol 17 (1) ◽  
pp. 80-85
Author(s):  
Jurgita MALAIŠKIENĖ
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Water Absorption ◽  
Firing Temperature ◽  
Frost Resistance ◽  
Effective Porosity ◽  
Flow Reserve ◽  
Optimum Quantity ◽  
Ceramic Samples ◽  
Porous Volume

In the paper, the influence of mullite wool waste additive on the properties of building ceramics is analysed. For that purpose four formation masses were prepared, dried and fired at the analogous regimes (maximum firing temperature 1080 °C). The fired samples were used to determine the structural and physical-mechanical properties. The values of these parameters are analysed: water absorption, total and effective porosity, rate of capillary mass flow, reserve of porous volume, compressive strength, density and estimated exploitation frost resistance. It has been determined that mullite wool waste can be applied to the production of building ceramics and the optimum quantity of waste in a formation mass is 10 % according to weight. Water absorption of those ceramic samples was less than 4 %, compressive strength was 28.6 MPa, density - 2033 kg/m3, forecasted resistance to frost about 400 cycles.http://dx.doi.org/10.5755/j01.ms.17.1.255

Effect of Sintering Temperature on Porous Structures and Mechanical Properties of Ti-39Nb-6Zr Alloys

2016 ◽  
Vol 848 ◽  
pp. 532-537 ◽  
Author(s):  
Ye Shao ◽  
Xiao Yun Song ◽  
Wen Jun Ye ◽  
Song Xiao Hui ◽  
Yang Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Sintering Temperature ◽  
Porous Structures ◽  
Powder Metallurgy Technique ◽  
Porous Ti ◽  
The Stability ◽  
Surrounding Bone ◽  
Compressive Tests

Titanium and its alloys have been widely used as implants replacing hard human tissues in biomedical fields. To improve the stability of implants in the surrounding bone tissues, the materials with porous structures were fabricated. In this paper powder metallurgy technique was employed to fabricate porous Ti-39Zr-6Nb (wt.%) alloys. The porous structures and mechanical properties of the porous alloys were examined by scanning electron microscopy (SEM) and compressive tests. The results showed that with increasing the sintering temperature the porosity of the alloys decreased and the compressive strength and the elastic modulus increased. The porosity of the alloys was in the range from 20.8% to 23.2%, and the pore sizes mostly centered in 10~30μm. The compressive strength and the elastic modulus were in the range from 110.4 to 292.4MPa and 4.7 to 12.4GPa respectively, which was close to human bone.

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Nanocrystalline Aluminum 5083 Alloy

2015 ◽  
Vol 782 ◽  
pp. 113-118
Author(s):  
Ying Mei Teng ◽  
Zhao Hui Zhang ◽  
Zi Zhou Yuan
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Compressive Strength ◽  
Sintering Temperature ◽  
Initial Pressure ◽  
Fine Grain ◽  
Microstructure And Mechanical Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Bulk Nanocrystalline

The bulk nanocrystalline (NC) aluminum (Al) 5083 was synthesized by spark plasma sintering (SPS) technique with low initial pressure of 1 MPa, high holding pressure of 300 MPa and holding time of 4 min at different sintering temperatures, using surface passivated nanopowders. The effect of sintering temperature on microstructure and mechanical properties of the bulk NC Al 5083 were investigated. Results indicate that the density, grain size, the hardness and the compressive strength of the bulk NC Al 5083 increase with an increase in sintering temperature. The mechanical properties of the material are greatly improved due to the fine grain size. The bulk NC Al 5083 sintered at 723 K has the highest micro-hardness of 2.37 GPa and the best compressive strength of 845 MPa.

scholarly journals Effects of Reinforcement Ratios and Sintering Temperatures on the Mechanical Properties of Titanium Nitride/Nickel Composites

2020 ◽  
Author(s):  
Yi-Cheng Chen ◽  
Shih-Fu Ou
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Compressive Strength ◽  
Titanium Nitride ◽  
Sintering Temperature ◽  
Hot Forging ◽  
Titanium Content ◽  
Reduction Reaction ◽  
Cold Isostatic Pressing ◽  
Nickel Metal

Abstract In this study, powder metallurgy was used to fabricate titanium nitride/nickel metal-matrix composites. First, Ti and Ni powders with weight ratios of 20:80, 50:50, and 80:20 were dry mixed for 24 h. After cold isostatic pressing, the green compacts were soaked in a water-based hot forging lubricant and sintered at 850, 950, and 1050°C for 1.5 h in an air atmosphere. The effects of the amount of titanium powder and the sintering temperature on the mechanical properties (hardness, wear resistance, and compressive strength) of the composites were investigated. The results indicated that titanium gradually transformed into titanium nitride near the surface after sintering due to the carbothermal reduction reaction; this transformation was observed to significantly increase the hardness. In addition, a titanium oxide film was observed to form between the titanium particles and the nickel matrix. The optimum sintering temperature of 950°C provides the composites with titanium-nickel weight ratios of 20:80 and 50:50, the latter of which exhibited the best mechanical properties (wear resistance and compressive strength). Furthermore, increasing the titanium content to 80% in the composite increased the hardness; however, the wear resistance and compressive strength were observed to reduce.

scholarly journals Thermal properties of polypropylene and high modulus polyethylene fibers reinforced concretes

2020 ◽  
Vol 13 (1) ◽  
pp. 32-38
Author(s):  
J. C. AMARAL JR ◽  
W. G. MORAVIA
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Construction Industry ◽  
Polymer Fibers ◽  
High Modulus ◽  
Modulus Polyethylene ◽  
Polyethylene Fibers

Abstract Concrete is one of the materials most used by the construction industry. Reinforcing this material with fibers is a technique used to improve its mechanical properties. Steel and polymer fibers are the main types used in this application and there are few studies about the influence of polymer fibers on the thermal properties of concrete. In order to analyze this influence, the present work carried out thermal conductivity, thermal expansion, and compressive strength after exposure to a temperature of 200 °C on specimens made of concrete with addition of polypropylene (PP) fibers and concrete with addition of high modulus polyethylene (HMPE). It was also conducted thermogravimetric analysis (TGA) on PP and HMPE fibers. The results show that the addition of polymer fibers alters the thermal properties of the concrete, reducing its thermal expansion, for example.

scholarly journals Sinterability of Magnesium Hydroxyapatite Bioceramic and Its Mechanical Properties

2018 ◽  
Vol 7 (3.11) ◽  
pp. 197
Author(s):  
Syakir Ramli ◽  
Mardziah Che Murad ◽  
Nik Rozlin Nik Masdek
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Compressive Strength ◽  
Organic Compounds ◽  
Sintering Temperature ◽  
Precipitation Method ◽  
Artificial Bone ◽  
Lower Strength ◽  
Similar Composition ◽  
Dense Bodies

One of the most favoured material in bone tissue engineering field nowadays is hydroxyapatite (HA), which is also known to be bioactive and has a similar composition to human bone. However, developing an artificial bone or bone graft using biocompatible HA is a challenging task due to the lower strength of the main substance. To improve the mechanical properties of synthetic HA, introduction of metallic substance such as magnesium (Mg) into HA has been proposed. In this present study, 0, 10 15 wt% of magnesium hydroxyapatite (MgHA) nanopowders were prepared by a simple wet precipitation method. These nanopowders were then compacted using a 10-ton compression uniaxial press machine with 150 MPa pressure to form a disc shape of dense MgHA. After that, the MgHA discs were sintered at a temperature of 1000 °C and 1100 °C to remove the organic compounds and further densify the ceramics. XRD results showed that the crystallinity of MgHA increased when the sintering temperature increases. The compression test showed that the 10 wt% MgHA sample recorded the highest compressive strength (243.59 MPa) when sintered at 1100 °C, while pure HA has the lowest value with 49.37 MPa. This study also demonstrates that sintering temperature at 1100 °C gives significant improvement to the mechanical properties of the MgHA dense bodies compared to sintering at 1000 °C.  

Porous cordierite ceramics with the poreformers of different kinds

2018 ◽  
pp. 46-52
Author(s):  
T. A. Habas ◽  
T. V. Vakalova ◽  
K. S. Kamyshnaya ◽  
E. V. D'yakonova ◽  
A. L. Cherepanova ◽  
...  
Keyword(s):  
Pore Formation ◽  
Pore Space ◽  
Porous Ceramics ◽  
Clay Suspension ◽  
Pore Former ◽  
Materials Development ◽  
Cordierite Ceramic ◽  
Organic Clay ◽  
Cordierite Ceramics ◽  
Porous Cordierite

The investigating results are given on the cordierite ceramic porous materials development. The wood waste and the crystalline carbamide were used as the pore-formers. The pore structure analysis showed that all samples had complex pore space composed of numerous elongated connected pores. The best pore formation factors were achieved when using the organic crystalline pore-former. It was demonstrated that nanodispersive metal alumina acted as the strengthening agent in course of the porous ceramics sintering. The organic clay suspension improves the cordierite powder's agglomeration capacity and gives rise to additional nano- and micro-pores.

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