Preparation and Characterization of Fe/SiC Ceramic-Metal Composites

2010 ◽  
Vol 434-435 ◽  
pp. 66-68 ◽  
Author(s):  
Zhong Sheng Liu ◽  
Gang Shao ◽  
De Liang Chen ◽  
Rui Zhang
Keyword(s):  
Bending Strength ◽  
Low Cost ◽  
High Hardness ◽  
High Strength ◽  
Precipitation Method ◽  
High Wear Resistance ◽  
Matrix Composites ◽  
Composite Powders ◽  
Pressing Method ◽  
Sic Composites

SiC is a perfect reinforced material, characteristic of high hardness, high wear- and corrosion-resistant property, and low cost. SiC-reinforced iron-matrix composites show high wear resistance, high hardness, high inflexibility and high strength, with wide applications as superior wear-resistant and high temperature materials. This paper reported a heterogeneous precipitation method to coat SiC with copper particles. The vacuum hot-pressing method was used to sinter the Fe/SiC composites with Cu-coated SiC powders. The techniques of XRD and SEM were used to characterize the compositions and microstructures of the samples. The Archimedes method was used to test the density. The results showed that SiC and Cu were homogeneously mixed in the composite powders obtained by the heterogeneous deposition method, and that the composites with 5wt% of SiC (Cu) obtained at 950°C have a high relative density of 96%, a high hardness of 4121 MPa and a high bending strength of 646 MPa. The enhanced properties of Fe/SiC composites could result from the improved interfacial consistency by using Cu-coated SiC powders, which could inhibit some adverse interfacial reactions.

Effect of Repeated Quenching on the Rotating Bending Strength of SAE52100 Bearing Steel

2012 ◽  
Vol 457-458 ◽  
pp. 1025-1031 ◽  
Author(s):  
Koshiro Mizobe ◽  
Edson Costa Santos ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
Katsuyuki Kida ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Bending Strength ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Wear Resistance ◽  
High Carbon ◽  
Austenite Grain ◽  
High Fatigue ◽  
Rotating Bending

Martensitic high carbon high strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications where high wear resistance are required. Due to its high fatigue strength, SAE 52100 is recently being used not only for the production of bearings but also shafts. Refining of prior austenite grain through repeated quenching is a procedure that can be used to enhance the material’s strength. In this work, the microstructure of repeatedly quenched SAE 52100 steel and its fatigue strength under rotating bending were investigated. It was found that repeated furnace heating and quenching effectively refined the martensitic structure and increased the retained austenite content. Repeated quenching was found to improve the fatigue strength of SAE 52100.

Preparation and Characterization of Reaction Sintering B4C/SiC Composite Ceramic

2014 ◽  
Vol 602-603 ◽  
pp. 536-539
Author(s):  
Hai Bin Sun ◽  
Yu Jun Zhang ◽  
Qi Song Li
Keyword(s):  
Fracture Toughness ◽  
High Performance ◽  
Bending Strength ◽  
Carbon Sources ◽  
High Hardness ◽  
High Strength ◽  
Composite Ceramic ◽  
High Fracture Toughness ◽  
Reaction Sintering ◽  
High Fracture

High hardness, high strength, high fracture toughness and low density are required for novel bulletproof materials. B4C/SiC composite ceramic is one of the most potential candidates. In this study, B4C/SiC composite ceramic was prepared by reaction sintering. The influence of B4C content, species and content of carbon, sintering temperature on the mechanical properties of B4C/SiC composite ceramic were studied. A high performance B4C/SiC composite ceramic was sintered at 1750°C for 30 min. Phenolic resin and carbon black were both chosen as carbon sources, whose favorable contents were 10wt%, 5wt%, respectively. The density of sintered bodies reduces with B4C content increases. To some extent, fracture toughness, bending strength improve initially and then deteriorate with the increase of B4C content whose optimal amount is 30wt%. The optimal fracture toughness and bending strength of the B4C/SiC composite ceramic are 5.07MPa·m1/2 and 487MPa, respectively. Meanwhile, the Viker-hardness of the sintered body is 30.2GPa, the density is as low as 2.82g/cm3.

TGA CHARACTERISTIC AND FABRICATION OF POROUS SiC CERAMICS

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2863-2868
Author(s):  
SEONG HOON KIM ◽  
HAN KI YOON ◽  
SEON JIN KIM ◽  
YI HYUN PARK
Keyword(s):  
Particle Size ◽  
Carbon Fibers ◽  
High Strength ◽  
Porous Ceramics ◽  
Pressing Method ◽  
Sic Ceramics ◽  
Length Direction ◽  
Specific Temperature ◽  
Sic Composites ◽  
Porous Sic

The long-range aim of this research is to develop porous ceramics with high strength, excellent thermal resistance and chemical stability at high temperature in environmental industry. The C f / SiC was made by hot pressing method with SiC powder whose particle size is 50nm and less on the average also Al 2 O 3, Y 2 O 3 and SiO 2 as additive. The carbon fibers of oxidation property are investigated by TGA for finding out decarburization point. As a result, decarburization point selected the specific temperature of TGA curve and the C f/ SiC composites occurred perfectly decarburization at carbon fibers so the clearly porous SiC ceramics were formed many holes of 3-5µm diameters through length direction by its reaction.

Synthesis of Titanium Carbide by Heat Treatment of TiH2 and Carbon Black Powders

2007 ◽  
Vol 534-536 ◽  
pp. 225-228 ◽  
Author(s):  
In Sup Ahn ◽  
Sung Yeal Bae ◽  
Ho Jung Cho ◽  
Chul Jin Kim ◽  
Dong Kyu Park
Keyword(s):  
Particle Size ◽  
Carbon Black ◽  
Metal Matrix ◽  
High Hardness ◽  
Heat Treating ◽  
Carbon Composite ◽  
Lattice Parameter ◽  
Matrix Composites ◽  
Composite Powders ◽  
Graphite Phase

TiC cermet is widely used for working dies with a high hardness and tool materials. In this research, we attempted to produce submicron sized TiC powders from the ball milled TiH2 and carbon black mixture by thermal treatment. The titanium hydride and carbon composite powders were milled under argon atmosphere for 7 hours at various ball to powder ratios. At the initial stage, an increase in particle size was observed, and graphite phase disappered. The TiC phase of 300nm mean particle size was obtained by milling for 5 hours. As a result, its morphologies were excessively agglomerated. At the heat treating temperature of 500°C, TiH2 phase transformed to Ti completely and the complete TiC of lattice parameter 0.431 nm was formed when the temperature reached 1000°C. Metal matrix composites(MMCs) based on the Fe-TiC system can be synthesized by spark plasma sintering. Specimen formed sintering Fe-TiC powders display a microstructure of uniformly dispersed TiC grain in a continuous metal matrix.

Influence of Compaction Pressure on Density, Bending Strength, and Microstructures of Al2O3-SiC-ZrO2 Ceramic Matrix Composites with Nb2O5 Additives

2018 ◽  
Vol 923 ◽  
pp. 61-65
Author(s):  
Dewi Lestari Natalia ◽  
Risly Wijanarko ◽  
Irene Angela ◽  
Bondan Tiara Sofyan
Keyword(s):  
Bending Strength ◽  
Compaction Pressure ◽  
Density Measurement ◽  
Ceramic Matrix Composites ◽  
High Hardness ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Sintering Process ◽  
Product Density ◽  
Microstructure Observation

Ceramic matrix composites (CMCs) are known to have high hardness, temperature and corrosion resistance, while being comparatively lightweight. One of many external factors that influence the mechanical properties of CMC is the compaction pressure given during fabrication process. Generally, greater amount of applied compaction pressure will result in improved final product density and bending strength. In this research, a type of CMCs was fabricated using Al2O3, SiC, and ZrO2 powder mixed with Nb2O5 additive of 81Al2O3-10SiC-5ZrO2-4Nb2O5 wt. % composition. Fabrication was done through mixing, compacting, and sintering process. Compaction was performed at 257, 308, and 359 MPa and finished with sintering process at 1400 °C for 4 h. Final samples were characterized by density measurement, 3-point bending strength testing, XRD for phase investigation, and microstructure observation using SEM-EDS. Results showing that samples with 308 MPa compaction pressure possessed the highest density and bending strength of 3.29 gr/cm3 and 14.91 MPa, respectively. These numbers however, declined on samples with higher compaction pressure of 359 MPa due to the formation of porosities caused by entrapped gas that failed to exit the sample of which compaction pressure was considered to be overwhelmingly high.

scholarly journals Fatigue and Fracture Behavior of Al6061-B4C Aluminium Matrix Composites

2020 ◽  
Vol 9 (4) ◽  
pp. 2121-2125
Keyword(s):  
Fracture Toughness ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Density Ratio ◽  
High Hardness ◽  
High Strength ◽  
Casting Process ◽  
Matrix Composites ◽  
Reaction Products ◽  
Automobile Engineering

In the present day engineering design and development activities many Scientists, Researchers and Engineers are striving hard to develop new and better engineering materials, which accomplishes high strength, low weight and energy efficient materials since the problems of environment and energy are major threshold areas. The development of new materials is growing day by day to replace the conventional materials in aerospace, marine engineering, automobile engineering industries etc., Hence, composite materials are found to be an alternative. A variety of metals and their alloys such as Aluminum, Magnesium and Titanium are comprehensively used as matrix materials. Among these Aluminium alloys have been used extensively, because of their excellent strength, low density, corrosion resistance and toughness. Similarly, many researchers have attempted to develop aluminum based metal matrix composites using different reinforcements such as SiC, Al2O3, B4C, TiC, TiO2, B4C etc., are added to the matrix to get required MMC’s. Among these reinforcements, B4C emerged as an exceptional reinforcement due to its high strength to density ratio, possesses high hardness and avoid the formation of interfacial reaction products with aluminum. Hence, in this paper attempts are made to fabricate Al 6061-3, 6, 9 and 12 wt.% B4C metal matrix composites by stir casting process to study fatigue life and fracture toughness as per ASTM standards. It is evident that fatigue strength and fracture toughness of the composites were enhanced with the addition of the wt.% of the reinforcement.

scholarly journals 3D Printing of High-Strength Water-Soluble Salt Cores Via Layered Extrusion Forming

2021 ◽  
Author(s):  
Xiaolong Gong ◽  
Xinwang Liu ◽  
Zheng Chen ◽  
Zhiyuan Yang ◽  
Wenming Jiang ◽  
...  
Keyword(s):  
Water Solubility ◽  
Bending Strength ◽  
Low Cost ◽  
High Strength ◽  
Linear Shrinkage ◽  
Liquid Phase Sintering ◽  
Water Soluble ◽  
Soluble Salt ◽  
Powder Content ◽  
Extrusion Forming

Abstract Core materials with high strength and excellent collapsibility are important for the manufacture of hollow composite structure castings. In this work, a novel technology to fabricate water-soluble Na2SO4-NaCl based salt cores with high strength and low cost by layered extrusion forming (LEF) was reported. The water-soluble Na2SO4 and NaCl powder were used as the matrix materials, and the bauxite powder was used as the reinforcing material. The effects of bauxite powder content and liquid phase sintering parameters on properties of the salt cores were studied. The results show that the salt-based slurry exhibits shear thinning property within the studied bauxite powder contents. When the content of bauxite powder was 20 wt.% and the sintering was at 630 ℃/30 min, the obtained salt cores show an optimal comprehensive performance, with the bending strength, linear shrinkage, water-solubility rate and moisture rate of 24.43 MPa, 6.3%, 207.6 (g/min·m2), and 0.29%, respectively. The complex water-soluble salt core samples prepared under the optimal parameters display high-strength and well-shaped morphology.

scholarly journals Evaluation of Mechanical Properties and Machinability Analysis of Al 6061 Hybrid Composite

2018 ◽  
Vol 6 (02) ◽  
Author(s):  
P. V. Rajesh ◽  
M. Sriram Prasanth ◽  
V. Sam Daniel ◽  
C. M. Saravanan
Keyword(s):  
Corrosion Resistance ◽  
Aluminium Alloy ◽  
Hybrid Composites ◽  
Low Cost ◽  
Weight Ratio ◽  
High Strength ◽  
Matrix Composites ◽  
Wear And Corrosion Resistance ◽  
The Individual ◽  
Machinability Analysis

Aluminium Matrix Composites are extensively used due to their desirable properties like low weight, low cost, high strength to weight ratio, good corrosion resistance, good thermal conductivity and high stiffness. Their applications are diversified in production, thermal, marine and automobile industries. Aluminium is extensively used in ships, aircrafts, cars, electrical wires and household utensils because it is abundant in nature. In the present study, Aluminium alloy Al6061 Hybrid Composites reinforced with Boron carbide and Coconut shell ash are fabricated to replace the individual Aluminium alloy Al6061. For that various tests to determine properties such as strength, hardness, wear and corrosion resistance are conducted on composite samples which make them fit to be used in aircraft window frames by reviewing various literatures. In addition to above, machinability analysis is performed on all the specimens and their surface roughness is measured. Based on the results obtained, we can come to a conclusion that the aluminium composite has superior properties than individual Al6061 alloy.

Experimental Investigation of Aluminium Hybrid Composites Reinforced with ZnS, TiO2 and BaTiO3 Produced Through Powder Metallurgy

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
S. Rajeshkannan ◽  
I. Manikandan ◽  
M. Vigneshkumar
Keyword(s):  
Powder Metallurgy ◽  
Hybrid Composites ◽  
Brinell Hardness ◽  
High Hardness ◽  
High Strength ◽  
Hardness Test ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Testing Instrument ◽  
X Ray

Semiconductors like ZnS, TiO2 and BaTiO3 were reinforced with Al-Al2O3 Metal Matrix Composites (MMCs) and were made through powder metallurgy in order to have high strength, high hardness and good thermal conductivity compared with conventional materials. Three MMC of test specimens were prepared with varying reinforcement ratio Al-Al2O3-ZnS(94-5-1), Al-Al2O3-TiO2(94-5-1), Al-Al2O3-BaTiO3(94-5-1) percentage by weight respectively. The hardness test has been made by using Brinell hardness testing instrument. Hardness test revealed that the addition of reinforcement TiO2, BaTiO3 increases the hardness value. However, the addition of ZnS to the Al-Al2O3 MMCs showed decrease in the hardness value. The crystal structure of the 3 composites were examined through X-Ray Diffraction (XRD) peaks.

Electrical Discharge Machining of Alumina-Zirconia-TiC Composites with Varying Zirconia Content

2013 ◽  
Vol 554-557 ◽  
pp. 1916-1921 ◽  
Author(s):  
Richard Landfried ◽  
Frank Kern ◽  
Rainer Gadow
Keyword(s):  
Electrical Discharge ◽  
Bending Strength ◽  
High Hardness ◽  
High Strength ◽  
Ceramic Composites ◽  
Matrix Composition ◽  
Pure Alumina ◽  
Electrically Conductive ◽  
Pure Zirconia ◽  
Strength And Toughness

Ceramic injection molding (CIM) or extrusion requires molds and dies with high hardness to reduce tool wear which occurs due to processing of highly abrasive ceramic compounds. Besides the wear resistance high strength and toughness are necessary for mold materials to withstand the loads during application. Recent work of the authors has shown the high potential of electrical discharge machinable ceramic composites based on oxide ceramic matrices for high wear applications. The use of alumina zirconia composites (AZC) as matrix for electrically conductive composites enables the combination of high hardness of alumina and high strength and toughness of zirconia in order to customize the properties of the mold material. This study focuses on development of ED machinable AZCs with addition of 24 vol.-% titanium carbide as electrically conductive phase. The composition of the matrix was varied from pure alumina to pure zirconia in 5 steps. Disks for mechanical and electrical characterization and electric discharge machining experiments were manufactured by hot pressing. Results show that hardness, strength and toughness can be almost linearly correlated to composition from pure alumina matrix with a 4-point bending strength of 430 MPa, a hardness of 2250 HV10 and a toughness of 3.7 MPa√m to pure zirconia matrix with 1020 MPa bending strength, 1490 HV10 and a toughness of 5.9 MPa√m. Variation of matrix composition also leads to significantly different EDM characteristics. The material removal rate shows a maximum at 19 vol.-% zirconia and 58 vol.-% alumina while surface roughness of the machined composites decreases significantly with increasing zirconia amount. SEM and EDX analysis were made to identify removal mechanisms of each ceramic matrix phase. It was found that alumina tends to be removed by vaporization due to electrical discharges. Zirconia, which has a higher melting and vaporization point than alumina melts during the formation of the plasma channel. Zirconia cannot be removed in total from the surface but forms a smooth and compact amorphous layer of resolidified material on both sample and electrode.

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