Porous AlN Ceramics Fabricated by Carbothermal Reduction

2014 ◽  
Vol 788 ◽  
pp. 627-631
Author(s):  
Yuan Lu ◽  
Jing Long Li ◽  
Jian Feng Yang ◽  
Peng Li
Keyword(s):  
Mechanical Properties ◽  
Carbothermal Reduction ◽  
Glass Phase ◽  
Sintering Temperature ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
High Porosity ◽  
Sintering Additives ◽  
Fine Microstructure ◽  
Complete Formation

A new method for preparing porous AlN ceramics with high porosity had been developed by carbothermal reduction of die-pressed green bodies composed of alumina, carbon, sintering additives and AlN seeds. The influences of sintering additives and sintering temperature on the microstructure and mechanical properties of porous AlN ceramics were investigated. XRD analysis proved that complete formation of AlN phase except for minor of glass phase. SEM analysis showed that the resultant porous AlN ceramics occupied fine microstructure and a uniform pore structure. Porous AlN ceramics with a porosity of 41~66% and a strength of 2.7~ 51.8 MPa were obtained.

Effects of Sintering Additives on Properties of Porous Silicon Nitride Ceramics Fabricated by Carbothermal Reduction

2008 ◽  
Vol 368-372 ◽  
pp. 878-880 ◽  
Author(s):  
Yuan Lu ◽  
Jian Feng Yang ◽  
Shao Yun Shan ◽  
Ji Qiang Gao ◽  
Zhi Hao Jin
Keyword(s):  
Carbothermal Reduction ◽  
Sintered Sample ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Sintering Additives ◽  
Sintering Additive ◽  
Fine Microstructure ◽  
Porous Si3n4 ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

In this paper, porous Si3N4 ceramics were fabricated by carbothermal reduction between silicon dioxide and carbon. The influences of four types of sintering additives on the microstructure and mechanical properties of the porous Si3N4 ceramics were investigated. XRD analysis proved complete formation of a single-phase β-Si3N4. SEM analysis showed that the resultant porous Si3N4 ceramics occupied fine microstructure and a uniform pore structure. The sintered sample with Lu2O3 as sintering additive showed finer, a higher aspect ratio β-Si3N4 grains. The addition of Eu2O3 accelerated the densification of porous Si3N4 ceramics, decreased the porosity and increased the flexural strength.

Fabrication of Porous Silicon Nitride with High Porosity

2007 ◽  
Vol 336-338 ◽  
pp. 1105-1108 ◽  
Author(s):  
Shao Yun Shan ◽  
Jian Feng Yang ◽  
Ji Qiang Gao ◽  
Wen Hui Zhang ◽  
Zhi Hao Jin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Xrd Analysis ◽  
Reduction Reaction ◽  
Sem Analysis ◽  
High Porosity ◽  
Sintering Additive ◽  
Fine Microstructure ◽  
Porous Si3n4 ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

In this study, porous Si3N4 ceramics were fabricated by carbothermal reduction reaction between silicon dioxide and carbon. The influences of different starting powders and sintering additives on microstructure and mechanical properties were investigated. XRD analysis demonstrated the formation of single-phase β-Si3N4 except for glass phase and minor of α-Si3N4 phase. SEM analysis showed that the resultant porous Si3N4 ceramics occupied fine microstructure and uniform pore structure. The samples with fine starting powder showed fine, high aspect ratio of β-Si3N4 grains and good mechanical properties. The addition of Al2O3 accelerated the densification of porous Si3N4 ceramics. With an increasing in the sintering additive content, the porosity decreased, the flexural strength increased.

Porous TiN Ceramics Fabricated by Carbothermal Reduction Method

2013 ◽  
Vol 745-746 ◽  
pp. 667-672 ◽  
Author(s):  
Yuan Lu ◽  
Jian Feng Yang ◽  
Zhi Liang Chen ◽  
Jian Jun Han ◽  
Jing Jing Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Pore Structure ◽  
Carbothermal Reduction ◽  
Xrd Analysis ◽  
Linear Shrinkage ◽  
Reduction Reaction ◽  
Sem Analysis ◽  
High Porosity ◽  
Microstructure And Mechanical Properties

Porous TiN ceramics with high porosity and uniform pore structure was prepared following the carbothermal reduction reaction between TiO2 and carbon. Influences of sintering additives and particle size of TiO2 on the microstructure and mechanical properties of porous TiN ceramics were investigated. Microstructure and mechanical properties of porous TiN ceramics were studied by XRD, SEM and three-point bending measurement. XRD analysis proved that the TiN phase has completely formed after reaction. In addition, SEM analysis showed that the resultant porous TiN ceramics were composed of fine grains with uniform pore structure. The addition of La2O3 not only accelerated the densification of porous TiN ceramics, but also decreased the porosity and increased the flexural strength. With a decrease in TiO2 particle size, the linear shrinkage increased and the porosity decreased accordingly.

scholarly journals Effect of 10% Zn Addition on Fabrication of Al Alloys on Mechanical Properties, Crystal Structure and Micro Structure

2019 ◽  
pp. 578-582
Author(s):  
Indah Juriani ◽  
Kerista Sebayang ◽  
Prof Muljadi
Keyword(s):  
Mechanical Properties ◽  
Sintering Temperature ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Al Alloys ◽  
Solid Solution Phase ◽  
Powder Metallurgy Method ◽  
Micro Structure ◽  
Zn Addition ◽  
Form Solid Solution

Aluminum-based alloy are one of the most alloy beneficial in the industry. Therefore, the research is done on the effect of Zn addition on Al alloys fabrication using powder metallurgy method. The composition of 0% and 10% Zn with sintering temperature varied: 550oC, 600oC, and 650oC respectively at that temperature held for 1 hour. Characterization includes: measurement of hardness, SEM analysis, and XRD analysis. The result of XRD analysis from the results of the rietveld refinement phase using the match program it is found several phases is Al, Zn and ZnO. From the result of SEM analysis it is found that the reaction between Zn and Al so as to form solid solution phase on the addition of 10% Zn with 650oC sintering temperature. From the result of characteristic of mechanical properties, the highest hardness is 99,5 HD at 10% Zn addition for all sintering temperatures. With the addition of Zn the mechanical properties is increasing.

Porous Silicon Nitride Ceramics Prepared by Reduction – Nitridation of Diatomite

2009 ◽  
Vol 620-622 ◽  
pp. 753-756
Author(s):  
Yao Hui Xue ◽  
Yuan Lu ◽  
Bo Wang ◽  
Jian Feng Yang ◽  
Wei Zhong Lu ◽  
...  
Keyword(s):  
Carbothermal Reduction ◽  
Sedimentary Rock ◽  
Aquatic Plant ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Main Ingredient ◽  
Nitride Ceramics ◽  
Fine Microstructure ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

In this paper, porous Si3N4 ceramics were fabricated by carbothermal reduction between carbon black and diatomite. Diatomite is a siliceous, sedimentary rock consisting principally of the fossilized skeletal remains of diatom, a unicellular aquatic plant related to the algae. The main ingredient of diatomite is the amorphous active silicon dioxide. The influence of diatomite particle size on the microstructure of sintering bodies was analyzed. XRD analysis demonstrated the formation of Si3N4 except for minor of glass phase. SEM analysis showed that the resultant porous β-Si3N4 ceramics occupied fine microstructure and uniform pore structure.

CHARACTERIZATION OF HYDROXYAPATITE/TI6AL4V COMPOSITE POWDER UNDER VARIOUS SINTERING TEMPERATURE

2015 ◽  
Vol 75 (7) ◽  
Author(s):  
Amir Arifin ◽  
Abu Bakar Sulong ◽  
Norhamidi Muhamad ◽  
Junaidi Syarif
Keyword(s):  
Mechanical Properties ◽  
Composite Powder ◽  
Sintering Temperature ◽  
Physical And Mechanical Properties ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Different Temperatures ◽  
Two Phases ◽  
Work Interaction

Hydroxyapatite (HA) has been widely used in biomedical applications due to its excellent biocompatibility. However, Hydroxyapatite possesses poor mechanical properties and only tolerate limited loads for implants. Titanium is well-known materials applied in implant that has advantage in mechanical properties but poor in biocompatibility. The combination of the Titanium alloy and HA is expected to produce bio-implants with good in term of mechanical properties and biocompatabilty. In this work, interaction and mechanical properties of HA/Ti6Al4V was analyzed. The physical and mechanical properties of HA/Ti6Al4V composite powder obtained from compaction (powder metallurgy) of 60 wt.% Ti6Al4V and 40 wt.% HA and sintering at different temperatures in air were investigated in this study. Interactions of the mixed powders were investigated using X-ray diffraction. The hardness and density of the HA/Ti6Al4V composites were also measured. Based on the results of XRD analysis, the oxidation of Ti began at 700 °C. At 1000 °C, two phases were formed (i.e., TiO2 and CaTiO3). The results showed that the hardness HA/Ti6Al4V composites increased by 221.6% with increasing sintering temperature from 700oC to 1000oC. In contrast, the density of the composites decreased by 1.9% with increasing sintering temperature. 

Technology and Mechanical Properties of Samples Obtained by Injection From Arboform L, V3 Nature Reinforced With Aramid Fibers

2014 ◽  
Author(s):  
Dumitru Nedelcu ◽  
Constantin Carausu ◽  
Ciprian Ciofu
Keyword(s):  
Mechanical Properties ◽  
Injection Pressure ◽  
Mold Temperature ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Aramid Fibers ◽  
Injection Process ◽  
Plastic Materials ◽  
Important Trend ◽  
Manufacturing Technologies

The use of recyclable materials has become an important trend in all activity areas, reason why material based on liquid wood called Arbofill, Arboblend and Arboform will replace plastic in different applications in the near future. The new materials are the main substances that have an important effect on company development and require some simple or complex manufacturing technologies. In case of Arboform L, V3 Nature the injected parts can be obtained using the same injection machines used for the injection of plastic materials. The technological injection parameters, such as: injection pressure, injection time, cooling time, mold temperature, etc., are different. The experimental research focused on tensile strength, friction coefficients, SEM analysis, XRD analysis and EDAX analysis. Considering all of these experimental results the Arboform L, V3 Nature reinforced with aramid fibers could replace the following plastic materials PA12, PVDF, ECTFE, PA66, PA12, PC, PP, PP GF 30, etc. Also taking into account all the results obtained, this material can replace plastic materials in many applications, such as: ornaments, including for cars, connectors, switches etc., electrical industry, different mobile accessories, computers, televisions, mobile phone cases, etc. The material obtained from Arboform reinforced with aramid fibers (5% percent) improved the injection process despite of easy decreasing of mechanical properties.

The Formation of Cobalt Chromium Molybdenum (CoCrMo) Foams Fabricated by Slurry Method

2016 ◽  
Vol 840 ◽  
pp. 197-201
Author(s):  
Sufizar Ahmad ◽  
M. Rosli ◽  
Nur Suliani Abdul Manaf ◽  
Murni Faridah Mahammad Rafter ◽  
Fazimah Mat Noor
Keyword(s):  
Sintering Temperature ◽  
Average Pore Size ◽  
Sem Analysis ◽  
High Porosity ◽  
Sintering Process ◽  
Cobalt Chromium ◽  
Average Pore ◽  
Slurry Method ◽  
Cobalt Chromium Molybdenum ◽  
Orthopedic Applications

Cobalt Chromium Molybdenum (CoCrMo) is a metal that are widely used in the biomedical field of orthopedic applications. CoCrMo foam was developed in the form of a porous structure where it has a high porosity on the surface with the different pore sizes and shapes. This research is intended to produce CoCrMo foam by using slurry method and to study the effect of composition and sintering temperature on the metal foams. The slurry of CoCrMo was prepared by mixing the binder materials of Methylcellulose (CMC), Polyethylene Glycol (PEG) and distilled water for an hour. Followed by mixing and stirring the CoCrMo powder for another 1 hour until it becomes slurries. Polyurethane (PU) foam was then impregnated into the slurry and dried for a day in the oven with 60 °C. Sintering process is carried out at temperature of 1000 °C, 1100 °C and 1200 °C using a tube furnace. Then sample of CoCrMo foam was going through a shrinkage measurement, microstructure analysis by using Scanning Electron Microscope (SEM), analysis of element by using Energy Diffraction X-ray (EDX) and also the density and porosity test by using Archimedes method. The sample with the composition of 65wt% was the best result in this experiment. While sintering temperature of 1200 °C produced the highest number of porosities. The shrinkage percentage is from 2.67% to 14.13%. The density obtained is in between 1.538 g/cm3 and 2.706 g/cm3 while the percentage of porosity is from 50.284% to 78.934%. The average pore size is in the range of 249.63μm to 445.38μm. The best sintering temperature and composition to produced high porosity were on 1200 °C and 65wt%.

Study of the mechanical properties and toughening mechanism of ZrO2 particles toughened Si3N4 ceramics

2020 ◽  
Vol 10 (6) ◽  
pp. 928-933
Author(s):  
Liang Tian ◽  
Qinglin Hou ◽  
Yingxia Wang ◽  
Yihui Hou
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Sintering Temperature ◽  
High Hardness ◽  
Fracture Morphology ◽  
Xrd Analysis ◽  
High Thermal Stability ◽  
Toughening Mechanism ◽  
Temperature Resistance ◽  
Si3n4 Ceramics

Si3N4 ceramic has excellent properties such as high temperature resistance, high hardness, and high thermal stability, but it has the disadvantages of high hardness and brittleness and difficulty in later processing. In this paper, ZrO2 was used as toughening phase, and ZrO2 toughened Si3N4 ceramics was prepared by injection molding. The effects of ZrO2 sintering temperature and content on the mechanical properties and fracture morphology were studied. Experiments show that when the ZrO2 content is 10 wt.% and the sintering temperature reaches 1650 °C, the bending strength and fracture toughness of Si3N4 ceramics reach the maximum at the same time, which are 767 MPa and 8.7 MPa·m1/2, respectively. The density is high. XRD analysis revealed that if the sintering temperature is too high, the ZrO2/Si3N4 system will generate a large number of ZrN impurity phases that cannot be phase-transformed, which ultimately affects the ceramic properties. According to fracture morphology, the toughening mechanism of ZrO2 is stress-induced phase transition.

scholarly journals Effect of Superheated Steam Treatment on the Mechanical Properties and Dimensional Stability of PALF/PLA Biocomposite

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 482 ◽  
Author(s):  
Ahmed Challabi ◽  
Buong Chieng ◽  
Nor Ibrahim ◽  
Hidayah Ariffin ◽  
Norhazlin Zainuddin
Keyword(s):  
Mechanical Properties ◽  
Dimensional Stability ◽  
Interfacial Adhesion ◽  
Superheated Steam ◽  
Weight Ratio ◽  
Xrd Analysis ◽  
Treatment Method ◽  
Sem Analysis ◽  
Steam Treatment ◽  
Different Temperatures

The effectiveness of superheated steam (SHS) as an alternative, eco-friendly treatment method to modify the surface of pineapple leaf fiber (PALF) for biocomposite applications was investigated. The aim of this treatment was to improve the interfacial adhesion between the fiber and the polymer. The treatment was carried out in an SHS oven for different temperatures (190–230 °C) and times (30–120 min). Biocomposites fabricated from SHS-treated PALFs and polylactic acid (PLA) at a weight ratio of 30:70 were prepared via melt-blending techniques. The mechanical properties, dimensional stability, scanning electron microscopy (SEM), and X-ray diffraction (XRD) for the biocomposites were evaluated. Results showed that treatment at temperature of 220 °C for 60 min gave the optimum tensile properties compared to other treatment temperatures. The tensile, flexural, and impact properties as well as the dimensional stability of the biocomposites were enhanced by the presence of SHS-treated PALF. The SEM analysis showed improvement in the interfacial adhesion between PLA and SHS-treated PALF. XRD analysis showed an increase in the crystallinity with the addition of SHS-PALF. The results suggest that SHS can be used as an environmentally friendly treatment method for the modification of PALF in biocomposite production.

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