Preparation and Characterization of 3Y-ZrO2 Composite Ceramics

2018 ◽  
Vol 281 ◽  
pp. 189-194
Author(s):  
Yin Yan Ju ◽  
Xue Xian Gan ◽  
Jie Guang Song ◽  
Fang Wang ◽  
Qun Huang ◽  
...  
Keyword(s):  
Ball Milling ◽  
Bending Strength ◽  
Raw Materials ◽  
Microwave Sintering ◽  
Linear Shrinkage ◽  
Organic Substrate ◽  
Mass Ratio ◽  
Composite Ceramics ◽  
Surface Morphologies

Dense 3Y-ZrO2composite ceramics were prepared by using 3Y-ZrO2nanopowders as the raw materials, via the process of ball milling, granulating, molding and calcination.We investigated the microstructure, surface morphologies, the mechanical property, the density and linear shrinkage rate of the sintered ceramics and the effect of the ball milling technics and the sintering technics on the above properties of the3Y-ZrO2composite ceramics via SEM and testing. The results show that the most excellent technics in all was explored as follows: the ultrafine ball milling by adding zirconium balls of 2 mm at the speed of 35 r/min for 10 h, with the mass ratio of zirconium ball, water and mixed powders of 6:1:1, the granulaing with 1.5% PVA, the CIP, the pre-sintering to remove the organic substrate to 500°C and the microwave sintering from 20°C to 1450 °Cin 80 min in which the duration at 1450°C was 20 min and the natural cooling time of the samples was 90 min. And the 3Y-ZrO2composite ceramics obtained by this process have a relative density of 99.2%, bending strength of 1098 MPa, and a fracture toughness of 7.8 MPa·m1/2.

scholarly journals Synthesis of Metal Organic Frameworks by Ball-Milling

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 15
Author(s):  
Cheng-An Tao ◽  
Jian-Fang Wang
Keyword(s):  
Ball Milling ◽  
Large Scale ◽  
Raw Materials ◽  
Metal Organic Frameworks ◽  
Research Topic ◽  
Mass Ratio ◽  
Time Consumption ◽  
Metal Organic ◽  
Short Time ◽  
Made In

Metal-organic frameworks (MOFs) have been used in adsorption, separation, catalysis, sensing, photo/electro/magnetics, and biomedical fields because of their unique periodic pore structure and excellent properties and have become a hot research topic in recent years. Ball milling is a method of small pollution, short time-consumption, and large-scale synthesis of MOFs. In recent years, many important advances have been made. In this paper, the influencing factors of MOFs synthesized by grinding were reviewed systematically from four aspects: auxiliary additives, metal sources, organic linkers, and reaction specific conditions (such as frequency, reaction time, and mass ratio of ball and raw materials). The prospect for the future development of the synthesis of MOFs by grinding was proposed.

scholarly journals The effect of microstructural features on the mechanical properties of LZSA glass-ceramic matrix composites

Cerâmica ◽  
2013 ◽  
Vol 59 (351) ◽  
pp. 351-359 ◽  
Author(s):  
F. M. Bertan ◽  
A. P. Novaes de Oliveira ◽  
O. R. K. Montedo ◽  
D. Hotza ◽  
C. R. Rambo
Keyword(s):  
Glass Ceramic ◽  
Bending Strength ◽  
Chemical Properties ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Linear Shrinkage ◽  
Matrix Composites ◽  
Particulate Reinforced ◽  
And Chemical Properties

This work reports on the characterization of ZrSiO4 particulate-reinforced Li2O-ZrO2-SiO2-Al2O3 (LZSA) glass-ceramic matrix composites. The typical physical/mechanical and chemical properties of the glass batches and the composites were measured. A composition with 60 wt.% ZrSiO4 was preliminarily selected because it demonstrated the highest values of bending strength (190 MPa) and deep abrasion resistance (51 mm³). To this same composition was given a 7 wt.% bentonite addition in order to obtain plasticity behavior suitable for extrusion. The sintered samples (1150 ºC for 10 min) presented a thermal linear shrinkage of 14% and bending strength values of 220 MPa.

The Preparation and Properties of Clay Bonded Silicon Carbide by Using Silicon Carbide Dusting Powder

2018 ◽  
Vol 922 ◽  
pp. 143-148 ◽  
Author(s):  
Shao Chun Xu ◽  
Zi Jing Wang ◽  
Ya Ming Zhang ◽  
Qiang Zhi ◽  
Xu Dong Wang ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Ball Milling ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Clay Content ◽  
Good Method ◽  
Sintering Additive ◽  
Carbide Refractory ◽  
Milling Method

In this paper, clay bonded silicon carbide was prepared through pressureless sintering process with silicon carbide dusting powder as raw materials and clay as sintering additive. The effects of the ball-milling method, sintering temperature and clay contents on the density, microstructure and mechanical properties of clay bonded silicon carbide refractory were studied. The planetary ball-milling was a good method to improve the density of the green body, and the density was increased simultaneously with an increase of the clay content. The liquid phase derived from low-melting eutectic mixtures of clay could prevent the superlative oxidation of silicon carbide. The mass increment of sintered samples decreased firstly and then increased at the sintering temperature range from 1250 to 1500 °C. The open porosity of samples decreased with the clay addition at a content range from 10 to 30 wt.%. The bending strength of the samples decreased firstly and then increased with the clay addition increasing. The optimum condition for preparing clay bonded silicon carbide with silicon carbide dusting powder was sintering at 1350 °C with 20 wt.% clay, and the obtained sample with a porosity of 24% achieved the bending strength of 78±7 MPa.

Preparation and Characterization of Fly Ash and Aluminium Waste Geopolymer

2014 ◽  
Vol 608 ◽  
pp. 108-113
Author(s):  
Sujitra Onutai ◽  
Sirithan Jiemsirilers ◽  
Shigetaka Wada ◽  
Parjaree Thavorniti
Keyword(s):  
Fly Ash ◽  
Bending Strength ◽  
Three Dimensional ◽  
Mass Ratio ◽  
Amorphous Structures ◽  
Alumino Silicate ◽  
Ft Ir ◽  
Greenhouse Emission ◽  
Mae Moh

Geopolymeris an alumino-silicate material with three dimensional amorphous structures. The main compositions are silica and alumina which were decomposed by alkaline solution. Geopolymer materials not only have comparable or superior properties to portland cement, but also have lower greenhouse emission. In this study, Preparation and characterization of geopolymer were investigated. The main composition of fly ash from Mae Moh power plant is SiO2 and Al2O3. The major composition of Aluminium waste from aluminium frame industry is Al2O3.The geopolymer pastes were mixed at various proportions of FA:Al-waste of 100:0 80:20 60:40 and 40:60 by weight. Sodium hydroxide and sodium silicate were used as alkali activators.A mass ratio of 2.5 Na2SiO3/NaOH and three concentrations of NaOH (5 10 15 M) were used. Geopolymer were cured at ambient temperature for 7days. Properties of geopolymer specimens were measured for example compressive strength, bending strength, phase by XRD, and bonding by FT-IR.

Characterization of a Water Clearing Treatment Residue and Its Application as Clay Ceramic Addition

2014 ◽  
Vol 775-776 ◽  
pp. 642-647
Author(s):  
Carolina Nascimento de Oliveira ◽  
Michelle Pereira Babisk ◽  
Fernando Vernilli ◽  
Veronica Scarpini Candido ◽  
Sergio Neves Monteiro ◽  
...  
Keyword(s):  
Raw Materials ◽  
Rupture Strength ◽  
Low Cost ◽  
Treatment Plant ◽  
Linear Shrinkage ◽  
Red Clay ◽  
Steel Making ◽  
Important Residue ◽  
Clay Ceramics

The addition of industrial residues into common red clay ceramic has been, from many decades, an alternative of using other low cost raw materials and, more recently, as an environmentally correct destination for polluting substances. An important residue, known as yellow sludge, is that generated at the water clearing stage (WCS) of a treatment plant by some heavy industries such as an integrated steel making. Since this yellow sludge residue is normally disposed in ways that pollutes water bodies, the objective of the present work was to characterize a WCS yellow sludge and investigate its addition into clay ceramics. The residue was characterized by X-ray fluorescence, particle size distribution and scanning electron microscopy. The addition was carried out up to 7.5 wt% followed by firing at 800oC. The added ceramics were evaluated in terms of water absorption, linear shrinkage, dry apparent density and flexural rupture strength. It was found that the residue addition does not practically alter the ceramic technical properties.

Effect of NiO Doping Order on Properties of 10NiO-NiFe2O4 Composite Ceramics

2014 ◽  
Vol 1053 ◽  
pp. 109-114
Author(s):  
Han Bing He
Keyword(s):  
Electrical Conductivity ◽  
Relative Density ◽  
Electric Conductivity ◽  
Bending Strength ◽  
Linear Shrinkage ◽  
Cold Isostatic Pressing ◽  
Shrinkage Rate ◽  
Sintering Process ◽  
Composite Ceramics ◽  
Isostatic Pressing

The 10NiO-NiFe2O4 composite ceramics doped with NiO were prepared with the cold isostatic pressing-sintering process. The effects of NiO doping order on the density, bending strength and electrical conductivity of NiFe2O4 composite ceramics were studied. The results show that, doping excess 10wt% NiO before synthesis of NiFe2O4 composite (doping order one) and doping excess 10wt% NiO after synthesis of NiFe2O4 composite (doping order two), the former’s samples have a better relative density 88.9% and linear shrinkage rate 9.82%, which is increased by 7.12% and 3.6% compared with that of latter’s samples, respectively. At the same time, the former’s samples also have a better electric conductivity and reach 1.29S/cm at 1233K, which is higher about 13.15% than those latter’s samples. However, the bending strength of the former’s samples just has 76.28Mpa, which is lower about 15.41% than that of the latter’s samples 88.04Mpa.

scholarly journals Evaluation of Kalalani vermiculite for production of high strength porcelain insulators

2019 ◽  
Vol 51 (2) ◽  
pp. 223-232 ◽  
Author(s):  
Blasius Ngayakamo ◽  
Eugene Park
Keyword(s):  
Water Absorption ◽  
Bulk Density ◽  
Bending Strength ◽  
Raw Materials ◽  
High Strength ◽  
Microstructural Characterization ◽  
Dielectric Strength ◽  
Raw Material ◽  
Porcelain Insulators

The present work has evaluated Kalalani vermiculite as a potential raw material for the production of high strength porcelain insulators. Three porcelain compositions were prepared to contain 0, 20 and 30 wt% of Kalalani vermiculite. Porcelain samples were fabricated using a semi-drying method. The chemical, mineralogical phases and microstructural characterization of the raw materials were carried out using XRF, XRD, and SEM techniques, respectively. Water absorption, bulk density, dielectric and bending strengths were performed on porcelain samples fired up to 1300?C. However, at the sintering temperature of 1250?C, the porcelain sample with 20 wt% of Kalalani vermiculite gave the dielectric strength of 61.3 kV/mm, bending strength of 30.54 MPa, bulk density of 2.21 g/cm3 and low water absorption value of 0.21 % which is the prerequisite properties for high strength porcelain insulators. It was therefore concluded that Kalalani vermiculite has the potential to be used for the production of high strength porcelain insulators

scholarly journals B4C-TiB2 Composite Ceramics with Ultra-High Fracture Toughness Fabricated by Spark Plasma Sintering

2020 ◽  
Author(s):  
Xingheng Yan ◽  
Xingui Zhou ◽  
Honglei Wang
Keyword(s):  
Fracture Toughness ◽  
Spark Plasma Sintering ◽  
Bending Strength ◽  
Raw Materials ◽  
Composite Ceramic ◽  
High Fracture Toughness ◽  
Composite Ceramics ◽  
High Fracture ◽  
Plasma Sintering ◽  
Spark Plasma

Abstract B4C-TiB2 composite ceramics with ultra-high fracture toughness were successfully prepared via spark plasma sintering using B4C and 30 vol.% Ti3SiC2 as raw materials at different sintering temperatures. The results show that compared with pure B4C ceramics sintered by SPS, the flexural strength and fracture toughness are significantly improved, especially the fracture toughness has been improved by leaps and bounds. When the sintering temperature is 1900 ℃, the B4C-TiB2 composite ceramic has the best comprehensive mechanical properties: hardness, bending strength and fracture toughness are 27.28 GPa, 405.11 MPa and 18.94 MPa·m1/2, respectively. The main two reasons for the ultra-high fracture toughness are the formation of TiB2 three-dimensional network covering the whole composites, and the existence of lamellar graphite at the grain boundary.

scholarly journals Fabrication of titanium carbide reinforced iron matrix cermet by vacuum carbothermal reduction of ilmenite

2019 ◽  
Vol 25 (1) ◽  
pp. 21-29
Author(s):  
Ke-Han Wu ◽  
Hai-Peng Gou ◽  
Guo-Hua Zhang ◽  
Kuo-Chih Chou
Keyword(s):  
Carbothermal Reduction ◽  
Bending Strength ◽  
Raw Materials ◽  
Energy Dispersive Spectrometer ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
Iron Matrix ◽  
Vacuum Sintering ◽  
Electron Probe Micro Analyzer ◽  
Carbon Mass

Iron matrix cermet reinforced with TiC has been produced by vacuum carbothermal reduction of ilmenite followed by sintering processes. The influences of reduction temperature and carbon mass ratio were discussed in detail. X-Ray diffraction (XRD), electron probe micro-analyzer (EPMA) and scanning electron microscope (SEM) with energy dispersive spectrometer (EDS) were employed to characterize the phase composition and microstructures. After carbothermic reduction, most of Mg, Mn, Ca evaporated from the sample; Si and part of Al was dissolved in the iron matrix. The obtained powders were used as the raw materials to produce TiC-Fe cermet by vacuum sintering. Density, hardness and bending strength of the samples were examined. The optimal cermet products after heat treatment had a density of 5.38 g?cm-1, a hardness of 1125.5 HV and a bending strength of 667 MPa, which was obtained at the carbon/ilmenite mass ratio of 0.378:1 at 1773 K under the pressure of 10 Pa.

Microstructure and Properties of Al2O3-ZrO2(n) Composite Ceramics Prepared by Microwave Sintering

2010 ◽  
Vol 177 ◽  
pp. 364-368
Author(s):  
Wen He ◽  
Yun Long Ai ◽  
Chang Hong Liu ◽  
Jian Ping Zhang ◽  
Jia Yuan Ding
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Bending Strength ◽  
Phase Transfer ◽  
Microwave Sintering ◽  
Abrasive Particle ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Composite Ceramics ◽  
Alumina Matrix

Al2O3-ZrO2(n) composite ceramics were prepared by microwave sintering. The properties and microstructure were investigated, including vickers hardness, fracture toughness, bending strength, wear resistance and heat-shocking resistance. The results show that the properties and microstructure of alumina matrix ceramics are affected by the addition of nano-ZrO2 particles. When the content of ZrO2 is 15vol%, the hardness, fracture toughness and bending strength of the Al2O3-ZrO2 composites reach maximum values 13350MPa, 6.41MPa•m1/2 and 502MPa, respectively. The wear resistance of alumina matrix ceramics are improved only on the condition of adding an appropriate amount of nano-ZrO2. The wear mechanism of the composites are abrasive particle wear and adhesion wear co-existing. The crack propagation rate of Al2O3 matrix ceramics decreases remarkably with the addition of nano-ZrO2 particles. The mechanisms of ZrO2 improving the heat-shocking resistance of alumina matrix ceramics are mainly phase transfer toughening. Nano-ZrO2 particles exist in the intragranular and grain boundary of alumina matrix ceramics, and exist intragranular structures.

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