Effect of Cr2O3-TiO2 Addition on the Physical Properties of Zirconia Toughened Alumina

2016 ◽  
Vol 840 ◽  
pp. 34-38 ◽  
Author(s):  
Hanisah Manshor ◽  
Abdul Wahid Ramli ◽  
Ahmad Zahirani Ahmad Azhar ◽  
Ezzat Chan Abdullah ◽  
Zainal Arifin Ahmad
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Magnesium Oxide ◽  
Cerium Oxide ◽  
Vickers Hardness ◽  
Ceramic Composite ◽  
Powder Materials ◽  
Powder Mixtures ◽  
Cutting Insert ◽  
Zirconia Toughened Alumina

Zirconia toughened alumina (ZTA) has good mechanical properties and widely used in cutting insert application. Although the ZTA is well known of its good mechanical properties, its still can be improved in order to produce better properties. It can be done by adding additives as reinforcement such as magnesium oxide (MgO), cerium oxide (CeO), titania (TiO2) and chromia (Cr2O3). The effect of TiO2-Cr2O3 addition on the physical properties of ZTA were investigated in this study. The composition of TiO2 was varied from 0 wt% to 3.5 wt% while Cr2O3 was fixed at 5 wt%. The starting powder materials were mixed by wet mixing for 30 minutes in acetone. Then the powder mixtures were hydraulically pressed at 260 MPa. The green pellets were sintered at 1600°C for 1 hour using an electrical furnace in presureless condition. The results were characterized by XRD, density, and also Vickers hardness. The ZTA-Cr2O3-TiO2 ceramic composite achieved the highest density of 4.1 g/cm3 and Vickers hardness of 1919 HV prior to the addition of 2.0 wt% TiO2. Therefore, it can be decisively concluded that the addition of Cr2O3-TiO2 does affected the properties of ZTA.

Effect of MgO Nano Particle on Mechanical Property and Microstructure of ZTA Ceramic Composite

2011 ◽  
Vol 364 ◽  
pp. 450-454 ◽  
Author(s):  
Ahmad Zahirani Ahmad Azhar ◽  
Mohamad Hasmaliza ◽  
Manimaran Ratnam ◽  
Zainal Arifin Ahmad
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Vickers Hardness ◽  
Ceramic Composite ◽  
Weight Percent ◽  
Alumina Ceramic ◽  
Nano Particle ◽  
Microstructural Observation ◽  
Hardness Property ◽  
Zirconia Toughened Alumina

The mechanical properties and microstructure of zirconia-toughened-alumina ceramic composite doped with nanoparticle of MgO is investigated. The nanoMgO weight percent was varied from 0.3 wt % to 1.3 wt %. Each batch of composition was mixed using ultrasonic cleaner and mechanical stirrer, uniaxially pressed and sintered at 1600 °C for 4 h in pressureless conditions. Analysis of bulk density, Vickers hardness and microstructural observation has been carried out. Results of Vickers hardness increased linearly with addition of more nanoMgO until a certain composition. Maximum Vickers hardness obtained was 1740HV with 1.1 wt % MgO. Furthermore, microstructural observations show that the Al2O3 grain size depends on the particle size of MgO, and is directly related to its hardness property.

Effect of Particle Sizes of Magnesium Oxide on Zirconia Toughened Alumina Vickers Hardness

2010 ◽  
Vol 173 ◽  
pp. 29-34 ◽  
Author(s):  
Ahmad Zahirani Ahmad Azhar ◽  
Foo Tai Kong ◽  
Mohamad Hasmaliza ◽  
Manimaran Ratnam ◽  
Zainal Arifin Ahmad
Keyword(s):  
Particle Size ◽  
Magnesium Oxide ◽  
Vickers Hardness ◽  
Oxide Particle ◽  
Microstructural Observation ◽  
Pinning Effect ◽  
Cutting Insert ◽  
Magnesium Oxide Particle ◽  
Zirconia Toughened Alumina ◽  
Density Results

Vickers hardness of zirconia toughened alumina added MgO with different composition and particle size has been studied. Five different size of magnesium oxide particle at different composition (0.5 wt % to 0.9 wt %) were used in this experiment. Each batch of composition was mixed, uniaxially pressed into 13 mm pellets and sintered at 1600oC for 4 hours in pressureless conditions. Analysis of Vickers hardness, microstructural observation and EDX analysis has been carried out. Microstructural observation showed that the addition of magnesium oxide greatly affected zirconia toughened alumina microstructure. Smaller Al2O3 grain size is observed with the presence of MgO thus improving its mechanical properties such as hardness and density. Results of Vickers hardness increased linearly with addition of more MgO until a certain composition. Each particle size of MgO addition show different composition is needed to reach the optimum Vickers hardness, depending on the particle size. The increase of hardness of the cutting insert is mainly contributed by small sized Al2O3 grains due to the microstructure pinning effect introduced by MgO. Maximum Vickers hardness achieved in this experiment is 1710 Hv, obtained at 0.7 wt% MgO with 0.15 µm particle size.

Effects of TiO2 addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina ceramic composite

2015 ◽  
Vol 41 (3) ◽  
pp. 3961-3967 ◽  
Author(s):  
Hanisah Manshor ◽  
Suriyana Md Aris ◽  
Ahmad Zahirani Ahmad Azhar ◽  
Ezzat Chan Abdullah ◽  
Zainal Arifin Ahmad
Keyword(s):  
Mechanical Properties ◽  
Ceramic Composite ◽  
Alumina Ceramic ◽  
Tio2 Addition ◽  
Zirconia Toughened Alumina

Microstructure and Mechanical Properties of Al2O3/NiAl In Situ Composites by Hot-Press-Aided Reaction Synthesis

2012 ◽  
Vol 581-582 ◽  
pp. 548-551 ◽  
Author(s):  
Guo Quan Qi ◽  
Feng Shou Shangguan ◽  
Li Neng Yang ◽  
Qiang Bai ◽  
Gang Wu
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
Elemental Powder ◽  
Reaction Synthesis ◽  
Hot Press ◽  
Dispersion Method ◽  
Powder Mixtures

Al2O3/NiAl composites were successfully fabricated by hot-press-assisted exothermic dispersion method with elemental powder mixtures of Ni, Al, NiO. The content of Al2O3 on the microstructures and mechanical properties of Al2O3/NiAl composites has been characterized. The results show that the Vickers hardness, flexural strength and fracture toughness of the composites increase with increasing Al2O3 content. When the Al2O3 content is 15 wt %, the flexural strength and the fracture toughness peaked at 765 MPa and 9.67 MPa•m 1/2, respectively. The improvement of mechanical properties is associated with a more homogeneous and finer microstructure developed by addition of Al2O3.

The Effects of Cr2O3 Addition on Fracture Toughness and Phases of ZTA Ceramic Composite

2012 ◽  
Vol 620 ◽  
pp. 35-39 ◽  
Author(s):  
Ahmad Zahirani Ahmad Azhar ◽  
Nik Akmar Rejab ◽  
Mohamad Hasmaliza ◽  
Mani Maran Ratnam ◽  
Zainal Arifin Ahmad
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Vickers Hardness ◽  
Ceramic Composite ◽  
Weight Percent ◽  
Ceramic Composites ◽  
Oxide System ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Mechanical And Physical Properties

Fracture toughness and phases of ceramic composites produced from alumina, yttria stabilized zirconia and chromia oxide system was investigated. The Cr2O3weight percent was varied from 0 wt% to 1.0 wt%. Each batch of composition was mixed, uniaxially pressed 13mm diameter and sintered at 1600 C for 4 h in pressureless conditions. Studies on on their mechanical and physical properties such as Vickers hardness and fracture toughness were carried out. Results show that an addition of 0.6 wt% of Cr2O3produces the best mechanical properties. Results of the highest fracture toughness is 4.73 MPa.m1/2,

Densification Behaviour and Mechanical Properties on MgO Doped Zirconia Toughened Alumina (ZTA) Prepared by Two-Stage Sintering

2021 ◽  
Vol 1030 ◽  
pp. 3-10
Author(s):  
Teow Hsien Loong ◽  
Ananthan Soosai ◽  
Suresh Muniandy
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Size ◽  
Total Hip Arthroplasty ◽  
Young’S Modulus ◽  
Vickers Hardness ◽  
Young's Modulus ◽  
Two Stage ◽  
Positive Effect ◽  
Zirconia Toughened Alumina

The effect of doping small amounts of Magnesium Oxide ranging between 0 to 1 vol% on Zirconia Toughened Alumina (ZTA) composites which is one of main biomaterial used for production of total hip arthroplasty were investigated. The samples were produced via conventional two-stage sintering with T1 varies between 1450°C and 1550°C with heating rate of 20°C/min. The samples were then rapid cooled to T2 set at 1400°C with holding time of 12 hours. The microstructural and mechanical properties of the two-stage sintered ZTA are then investigated to determine the feasibility of MgO addition. Combination of two-stage sintering at T1 above 1500 and also small amount of MgO up to 0.5 vol% were shown to have positive effect on ZTA which exhibited improvement on its grain size, mechanical properties such as Vickers hardness, Young’s modulus and fracture toughness compared to undoped ZTA composites. The sample with 0.5 vol% MgO addition sintered at T1 of 1500°C and T2 1400°C was able to achieve Vickers hardness of 19.6 GPa, Young’s modulus of 408 GPa and fracture toughness of 6.8 MPam1/2 without significant grain growth compared to undoped ZTA composites.

scholarly journals Processing of AISI H11 Tool Steel Powder Modified with Carbon Black Nanoparticles for the Additive Manufacturing of Forging Tools with Tailored Mechanical Properties by Means of Laser Metal Deposition (LMD)

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 659 ◽  
Author(s):  
Oliver Hentschel ◽  
Laurids Siegel ◽  
Christian Scheitler ◽  
Florian Huber ◽  
Daniel Junker ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Carbon Black ◽  
Tool Steel ◽  
Vickers Hardness ◽  
Steel Powder ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Powder Mixtures ◽  
Carbon Black Nanoparticles

Within the scope of the presented work the processing of AISI H11 (1.2343 or X37CrMoV5-1) tool steel powder modified by adding carbon black nanoparticles in varying concentrations by means of Laser Metal Deposition (LMD) is extensively investigated. On the basis of single weld track experiments, multi-layered cuboid-shaped samples made out of pure AISI H11 tool steel powder as well as modified tool steel powder mixtures were manufactured by applying various process parameters. The main scientific aim of the investigations was to achieve a basic understanding of the influence of the added carbon black nanoparticles on the resulting sample properties. For that purpose, the generated specimens were first analyzed with respect to relative density, inner defects, microstructure, Vickers hardness and chemical composition. Subsequently, the mechanical properties of post-heat-treated specimens were investigated, with the focus on the yield strength (Y0.2%), by means of compression tests. We prove that by adding carbon black nanoparticles to the initial AISI H11 powder, the formation of martensitic and bainitic phases, as well as the precipitation of carbides at the grain boundaries, are enhanced. As a result, a significant increase of Vickers hardness and of the compression yield strength by up to 11% can be achieved in comparison to samples made out of the unmodified AISI H11 powder. Furthermore, it can be fundamentally demonstrated that the fabrication of parts with layer-specific variable hardness can be realized by the controlled changing of the powder mixtures used during the layer-by-layer manufacturing approach.

Study on Mechanical Properties of Zirconia-Alumina Based Ceramics

2014 ◽  
Vol 625 ◽  
pp. 81-84 ◽  
Author(s):  
Kalaimani Markandan ◽  
Jit Kai Chin ◽  
Michelle T.T. Tan
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Surface Morphology ◽  
Physical Properties ◽  
Elemental Composition ◽  
Ceramic Composite ◽  
Ceramic Composites

This paper describes the characterisations of ceramic composites consisting of different compositions of alumina and zirconia. The material characterisations were performed from the aspects of densification, hardness and fracture toughness. The surface morphology and elemental composition of the composite were studied using SEM and EDX respectively. As for physical properties, the highest attainable hardness and fracture toughness were 11.35 GPa and 3.41 MPa m0.5respectively for ceramic composite consisted of 80 wt % Zr and 20 wt% Al. Sintering at 1150oC assisted in the densification of ceramics.

Effect of Titania and Magnesia on the Physical Properties of Zirconia Toughened Alumina

2016 ◽  
Vol 840 ◽  
pp. 82-86
Author(s):  
Hanisah Manshor ◽  
Wan Muhammad Ihsan Wan Sabri ◽  
Abdul Wahid Ramli ◽  
Ahmad Zahirani Ahmad Azhar ◽  
Ezzat Chan Abdullah ◽  
...  
Keyword(s):  
Physical Properties ◽  
Ceramic Composite ◽  
High Hardness ◽  
Secondary Phase ◽  
Solubility Limit ◽  
Ceramic Composites ◽  
High Temperature Strength ◽  
Constant Weight ◽  
Weight Percentage ◽  
Zirconia Toughened Alumina

ZTA based ceramic composite system is widely accepted as cutting tools for many of these harder and wear resistant workpiece materials. This is due to their beneficial mechanical properties i.e. high temperature strength, high hardness and ability to maintain its cutting edge shape at higher temperatures. Although a lot of works have focused on the effect of various sintering additives on the ZTA ceramic system, the effect of Magnesia (MgO) and Titania (TiO2) on ZTA has not yet been studied. In this work, the physical properties of Zirconia Toughened Alumina (ZTA) ceramic composite with MgO and TiO2 as additives was investigated. The composition of TiO2 varied from 0 wt% to 3.5 wt% whereby other materials such as Al2O3, Yttria Stabilized Zirconia (YSZ) and MgO were kept at constant weight percentage. Sintered samples were then tested and analyzed by XRD, Vickers hardness and high precision densimeter to investigate phase content, hardness value and densification respectively. Results showed that the solubility limit of TiO2 in ZTA-MgO ceramic composites is at 2.0 wt%. Further addition of TiO2 resulted in the formation of secondary phase known as Zirconium titanium oxide (Zr0.35TiO0.65O2) which deteriorate the properties exhibited by ZTA-MgO-TiO2 ceramic composites.

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