Titanium Carbide Reinforced Composite Tool Ceramics Based on Alumina

2010 ◽  
Vol 65 ◽  
pp. 50-55
Author(s):  
Magdalena Szutkowska ◽  
Barbara Smuk ◽  
Marek Boniecki
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Titanium Carbide ◽  
High Hardness ◽  
Ceramic Composites ◽  
Critical Stress Intensity Factor ◽  
Pure Alumina ◽  
Reinforced Composite ◽  
Composite Tool ◽  
Tool Ceramics

The present study reports some preliminary results obtained by reinforcing Al2O3-10 wt% ZrO2 (partially stabilized with Y2O3 -Y5 and monoclinic phase m-ZrO2) composite with TiC phase in amount of 5 wt %. Ceramic composites were prepared on the basis submicro and nano scale trade powders. Apparent density, porosity, Vicker’s hardness, Young’s modulus and fracture toughness (KIC) were determined. Wear resistance (Vn) very important property for tool ceramics was specified by the speed of mass lost. Scanning electron microscopy (SEM) to observation of the fracture surface microstructure was used. The titanium carbide reinforced composite tool ceramics based on alumina exhibit high hardness, fracture toughness (critical stress intensity factor KIC increase up to 5,2 MPa m1/2), high elastic moduli and higher wear resistance in related to pure alumina. Cutting tests confirm the high performance of these ceramic composites.

HOWMET No. 3

Alloy Digest ◽  
1968 ◽  
Vol 17 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Base Alloy ◽  
High Hardness ◽  
Heat Treating ◽  
High Heat ◽  
Cobalt Base Alloy ◽  
Metal Products ◽  
Cobalt Base

Abstract HOWMET No. 3 is a cobalt-base alloy having high hardness and compressive strength, high heat and corrosion resistance, along with excellent abrasion and wear resistance. It is recommended for bushings, scrapers, valve parts, and other machinery components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Co-56. Producer or source: Howmet Corporation Metal Products Division.

DOUBLE SEVEN

Alloy Digest ◽  
1962 ◽  
Vol 11 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Physical Properties ◽  
Cold Working ◽  
High Hardness ◽  
Heat Treating ◽  
Heavy Duty ◽  
High Carbon ◽  
Die Steel ◽  
High Chromium

Abstract DOUBLE SEVEN is an air hardening high-carbon high-chromium tool and die steel having high hardness and wear resistance. It is recommended for shear blades, cold working tools, and heavy duty dies. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-124. Producer or source: Edgar Allen & Company Ltd, Imperial Steel Works.

scholarly journals Role of titanium carbide and alumina on the friction increment for Cu-based metallic brake pads under different initial braking speeds

Friction ◽  
2020 ◽  
Author(s):  
Tao Peng ◽  
Qingzhi Yan ◽  
Xiaolu Zhang ◽  
Yan Zhuang
Keyword(s):  
Wear Resistance ◽  
Titanium Carbide ◽  
Volume Fraction ◽  
Coefficient Of Thermal Expansion ◽  
Interface Bonding ◽  
Brake Pads ◽  
Reinforced Composite ◽  
The Poor ◽  
The Matrix

AbstractTo understand the effect of abrasives on increasing friction in Cu-based metallic pads under different braking speeds, pad materials with two typical abrasives, titanium carbide (TiC) and alumina (Al2O3), were produced and tested using a scale dynamometer under various initial braking speeds (IBS). The results showed that at IBS lower than 250 km/h, both TiC and Al2O3 particles acted as hard points and exhibited similar friction-increasing behavior, where the increase in friction was not only enhanced as IBS increased, but also enhanced by increasing the volume fraction of the abrasives. However, at higher IBS, the friction increase was limited by the bonding behavior between the matrix and abrasives. Under these conditions, the composite containing TiC showed a better friction-increasing effect and wear resistance than the composite containing Al2O3 because of its superior particle-matrix bonding and coefficient of thermal expansion (CTE) compatibility. Because of the poor interface bonding between the matrix and Al2O3, a transition phenomenon exists in the Al2O3-reinforced composite, in which the friction-increasing effect diminished when IBS exceeded a certain value.

KENTANIUM K162B

Alloy Digest ◽  
1962 ◽  
Vol 11 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Compressive Strength ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Titanium Carbide ◽  
Physical Properties ◽  
Abrasion Resistance ◽  
High Hardness ◽  
High Heat ◽  
Temperature Performance

Abstract Kentanium K162B is a titanium carbide cermet having high heat and oxidation resistance along with high hardness and abrasion resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness, creep, and fatigue. It also includes information on high temperature performance and corrosion resistance as well as machining and joining. Filing Code: Ti-33. Producer or source: Kennametal Inc..

A scalable and facile synthesis of alumina/exfoliated graphite composites by attrition milling

RSC Advances ◽  
2015 ◽  
Vol 5 (113) ◽  
pp. 93267-93273 ◽  
Author(s):  
Eunsil Lee ◽  
Ki Beom Choi ◽  
Sung-Min Lee ◽  
Jong-Young Kim ◽  
Jong-Yeol Jung ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Fracture Toughness ◽  
Wear Resistance ◽  
Exfoliated Graphite ◽  
Facile Synthesis ◽  
One Pot ◽  
Pure Alumina ◽  
Graphite Composite ◽  
Attrition Milling ◽  
Graphite Composites

We present a facile one-pot synthesis of alumina/exfoliated graphite composite having excellent electrical conductivity (>1,000 S m−1), fracture toughness (5.6 MPa m0.5), and wear resistance, which is enhanced by 7.7 times compared to pure alumina.

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.

Microstructural and Mechanical Properties Changes of Silicon Nitride Based Ceramic Using Post-Sintering Heat Treatment

2012 ◽  
Vol 727-728 ◽  
pp. 1085-1091
Author(s):  
José Vitor C. Souza ◽  
O.M.M. Silva ◽  
E.A. Raymundo ◽  
João Paulo Barros Machado
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fracture Toughness ◽  
Grain Size ◽  
Wear Resistance ◽  
High Hardness ◽  
Gas Pressure ◽  
Low Density ◽  
Nitrogen Gas ◽  
Structural Applications

Si3N4based ceramics are widely researched because of their low density, high hardness, toughness and wear resistance. Post-sintering heat treatments can enhance their properties. Thus, the objective of the present paper was the development of a Si3N4based ceramic, suitable for structural applications, by sintering in nitrogen gas pressure, using AlN, Al2O3, and Y2O3as additives and post-sintering heat treatment. The green bodies were fabricated by uniaxial pressing at 80 MPa with subsequent isostatic pressing at 300 MPa. The samples were sintered at 1900°C for 1 h under N2gas pressure of 0.1 MPa. Post-sintering heat treatment was performed at 1500°C for 48 h under N2gas pressure of 1.0 MPa. From the results, it was observed that after post-sintering heat treatment there was a reduction of α-SiAlON phase and increase of β-Si3N4phase, with consequent changing in grain size, decrease of fracture toughness and increase of the Vickers hardness.

Utilization of Light Microscopy for the Evaluation of Fracture Toughness of Cemented Carbides

2015 ◽  
Vol 647 ◽  
pp. 108-114
Author(s):  
Zbyněk Špirit ◽  
Antonín Kříž
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Metal Matrix ◽  
Computational Models ◽  
Cutting Tools ◽  
High Hardness ◽  
Cemented Carbides ◽  
Soft Matrix ◽  
Heat Loading ◽  
Indentation Methods

<span><p><span lang="EN-US">Cemented carbides belong among materials with high hardness and wear resistance even at temperatures around 700 °C. These properties are due to carbide composite structure which is formed mainly of tungsten carbide (WC) in combination with a metal matrix (usually cobalt). A synergistic effect </span><span><span lang="EN-US">that has a positive</span></span><span lang="EN-US"> <span>impact on the</span> <span>final properties</span></span><span lang="EN-US"> is obtained by the combination of hard carbides and a soft matrix</span><span><span lang="EN-US">.</span></span><span lang="EN-US"> </span><span lang="EN-US">The high hardness of the cemented carbides is associated with a decrease in fracture toughness which in the case of cutting tools is an important property. <span>It is therefore necessary to measure the value of fracture toughness and thus monitor the state of the material.</span></span><span lang="EN-US"> </span><span><span lang="EN-US">In practice,</span></span><span lang="EN-US"> <span>the fracture</span> <span>toughness</span> <span>of cemented</span> <span>carbides is usually tested by indentation</span> <span>methods</span> <span>of</span> <span>metallographic</span> <span>samples.</span> <span>Therefore, this work focuses on the comparison and optimization of computational models for determining fracture toughness using indentation methods.</span></span><span lang="EN-US"> </span><span><span lang="EN-US">Eight types of</span></span><span lang="EN-US"> <span>cemented carbides</span> <span>used</span> <span>for the manufacture</span> <span>of cutting tools were tested. F</span></span><span lang="EN-US">racture toughness of selected cemented carbides was measured after heat loading.</span></p>

Influence of Titanium Carbide Fraction on Material Properties and EDM of ZrO2-TiC Ceramics

2014 ◽  
Vol 611-612 ◽  
pp. 637-642 ◽  
Author(s):  
Richard Landfried ◽  
Frank Kern ◽  
Rainer Gadow
Keyword(s):  
Fracture Toughness ◽  
Titanium Carbide ◽  
Material Properties ◽  
Matrix Material ◽  
Ceramic Composites ◽  
Oxide Ceramics ◽  
Electrically Conductive ◽  
Ceramic Injection Molding ◽  
Conductive Oxide ◽  
Carbide Content

EDM of electrically conductive oxide ceramics with addition of titanium carbide have been successfully applied as wear resistant tool inserts in ceramic injection molding or extrusion. In recent years especially alumina based ceramic composites toughened by zirconia have shown their potential in the field of ED machinable ceramics however revealing some drawbacks resulting from their moderate fracture toughness. This study focuses on the zirconia based ceramics with addition of different amounts of titanium carbide as electrically conductive phase (26-36 vol.-%) in order to improve the toughness of ED machinable ceramics. Additionally the influence of the titanium on removing mechanisms during machining as well as the hardness and strength of the material was investigated. It was found that the use of zirconia as matrix material does improve the toughness and strength compared to alumina based composites whereas the drawback of zirconia based materials concerning machinability and lower hardness can be only partially compensated by adjusting the titanium carbide content.

Microstructural and Mechanical Properties of Ti3SiC2 Composites

2008 ◽  
Vol 403 ◽  
pp. 189-192
Author(s):  
Jow Lay Huang ◽  
Horng Hwa Lu
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Wear Resistance ◽  
Chemical Stability ◽  
Hot Pressing ◽  
Ceramic Composites ◽  
Fracture Mechanisms ◽  
Jet Engines ◽  
Potential Applications ◽  
New Material

Ti3SiC2 has been a spectacular material, as it combines many of the best properties of metals and ceramics. This new material has potential applications for fabrication of jet engines and in bonding phases. Microstructure can further enhance the mechanical properties, such as strength, wear resistance and chemical stability. In the current research the different starting powder systems were used to synthesize Ti3SiC2 by hot pressing. The contents of Si were controlled appropriately to obtain Ti3SiC2/TiC ceramic composites. Preliminary results indicated that the fracture toughness and strength were improved. The influences of TiC contents on the microstructure and mechanical properties were investigated and the fracture mechanisms of Ti3SiC2/TiC ceramic composites are discussed qualitatively.

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