Effect of High-Energy Ball Milling of ZrB2 Powder on the Microstructure and Mechanical Properties of ZrB2-SiC Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 723-728
Author(s):  
Qi Long Guo ◽  
Jun Guo Li ◽  
Qiang Shen ◽  
Lian Meng Zhang
Keyword(s):  
Ball Milling ◽  
Average Particle Size ◽  
Sintered Sample ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Sample Introduction ◽  
Second Phase ◽  
Average Particle ◽  
Sic Ceramics ◽  
Energy Ball

The sinterability of ZrB2-20vol.% SiC ceramics by high-energy ball milling as well as introduction of Zr and Al as sintering additives. Densification process and microstructure of ZrB2-SiC ceramics were investigated. After high-energy ball milling, the average particle size decreased to about 500 nm-2 μm, and ZrB2-SiC powder can be sintered to 98.92% theoretical density at 1800 °C, but a trace of amount of oxidation (ZrO2) were detected in sintered sample. Introduction of Zr, Al and C combined with high-energy ball milling enhanced the densification of ZrB2-SiC ceramics and reduced the particle sizes, and the relative density of obtained ceramic reached up to 99.49% at 1800 °C. The additions of Zr, Al and C can remove the oxide impurities of the surface of ZrB2 particles and form a reaction between oxide impurities. The fracture toughness increased of the 40% when ZrB2 powders were milled by high-energy ball milling, and increased to 4.77±0.18 MPa•m1/2. However, the attrition-milled composites had lower hardness and Young’s modulus, which was attributed to the presence of a second phase in the grain boundaries.

Development of Ni/h-BN Self-Lubricating Composite Powder by High-Energy Ball Milling

2016 ◽  
Vol 869 ◽  
pp. 277-282
Author(s):  
Moisés Luiz Parucker ◽  
César Edil da Costa ◽  
Viviane Lilian Soethe
Keyword(s):  
Ball Milling ◽  
Milling Time ◽  
Solid Lubricants ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Second Phase ◽  
Average Particle ◽  
Composite Powders ◽  
The Matrix ◽  
Energy Ball

Solid lubricants have had good acceptance when used in problem areas where the conventional lubricants cannot be applied: under extreme temperatures, high charges and in chemically reactive environments. In case of materials manufactured by powder metallurgy, particles of solid lubricants powders can be easily incorporated to the matrix volume at the mixing stage. In operation, this kind of material provides a thin layer of lubricant that prevents direct contact between the surfaces. The present study aimed at incorporating particles of second phase lubricant (h-BN) into a matrix of nickel by high-energy ball milling in order to obtain a self-lubricating composite with homogeneous phase distribution of lubricant in the matrix. Mixtures with 10 vol.% of h-BN varying the milling time of 5, 10, 15 and 20 hours and their relationship ball/powder of 20:1 were performed. The effect of milling time on the morphology and microstructure of the powders was studied by X-ray diffraction, SEM and EDS. The composite powders showed reduction in average particle size with increasing milling time and the milling higher than 5 hours resulted in equiaxial particles and the formation of nickel boride.

Microstructural Characterization of 66%Co-28%Cr-6%Mo Dental Alloy Powder Obtained by High-Energy Ball Milling

2014 ◽  
Vol 802 ◽  
pp. 51-55 ◽  
Author(s):  
Claudinei dos Santos ◽  
Alexandre Fernandes Habibe ◽  
Durval Rodrigues ◽  
José C. Minatti ◽  
Jefferson Fabrício C. Lins ◽  
...  
Keyword(s):  
Ball Milling ◽  
Average Particle Size ◽  
Microstructural Characterization ◽  
High Energy ◽  
Inert Atmosphere ◽  
High Energy Ball Milling ◽  
Average Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Energy Ball

In this work, the microstructural features of the particles based on 66% Co-28% Cr-6% Mo alloy, were investigated by X-ray diffraction and Scanning electron microscopy (SEM). Powders obtained by high-energy ball milling in an inert atmosphere, and held in SPEX mill with times between 15min and 120min, about ball/powder ratio of 6:1, were characterized by X-ray diffraction indicating in all conditions, Co phase as the crystalline phase of the system. The powders have a morphology that indicate a continuous reduction in average particle size as a function of increasing time, however, the shape of the particles initially flat for times up to 30 minutes, becomes spherodized after 30 minutes of grinding.

Nanocrystalline Diamond Particles Prepared by High-Energy Ball Milling Method

2013 ◽  
Vol 284-287 ◽  
pp. 168-172 ◽  
Author(s):  
Chii Ruey Lin ◽  
Da Hua Wei ◽  
Minh Khoa Ben Dao ◽  
Ren Jei Chung ◽  
Ming Hong Chang
Keyword(s):  
Ball Milling ◽  
Average Particle Size ◽  
Diamond Powder ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Acid Mixture ◽  
Average Particle ◽  
X Ray ◽  
Energy Ball

In this present work, nanodiamond (ND) particles were successfully prepared from commercial micron diamond powder at room temperature by high energy ball milling process using an oscillatory mill (SPEX8000). The size reduction and structural evolutions of the milled samples were investigated as a function of the milling time by means of X-ray diffraction, and field emission scanning electron microscopy. The line broadening technique was used to determine the crystallite size and lattice strain. After 40 h of milling, obtained ND particles possessed uniform shape and 25 nm of average particle size. Also, energy dispersive X-ray results revealed the high purity of ND and demonstrated that the purification process using harsh acid mixture were effective to remove metal and non-diamond carbon impurities produced in milling stage. All results propose a scalable method to preparation ND particles as well as nanocrystalline materials.

High Energy Planetary Ball Milling of SiC Powders

2007 ◽  
Vol 351 ◽  
pp. 7-14 ◽  
Author(s):  
Yu Bai Pan ◽  
Zheng Ren Huang ◽  
Dong Liang Jiang ◽  
Léo Mazerolles ◽  
D. Michel ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Ball Milling ◽  
Average Crystallite Size ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Fine Powders ◽  
Sic Ceramics ◽  
Sem And Tem ◽  
Planetary Ball Milling ◽  
Energy Ball

The effects of high-energy ball milling on SiC powders were studied using a planetary apparatus. Conditions to obtain nanostructured SiC powders with an average crystallite size of 4 nm were determined and powders were characterized by XRD, SEM and TEM analyses. This process was applied to prepare fine powders leading to dense SiC ceramics by sintering at 1900oC for 30 minutes under 30 MPa in argon.

Effect of VC/Cr3C2 Additions on Microstructure and Mechanical Properties of WC-16TiC-XTaC-10Co Ultrafine Cemented Carbides

2012 ◽  
Vol 476-478 ◽  
pp. 1214-1217 ◽  
Author(s):  
Chong Cai Zhang ◽  
Quan Wang ◽  
Qun Qun Yuan ◽  
Long Wang
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Ball Milling ◽  
Rupture Strength ◽  
Average Particle Size ◽  
High Energy ◽  
Cemented Carbides ◽  
Average Particle ◽  
Hardness Increase ◽  
Energy Ball

In this paper, the WC-16TiC-xTaC-10Co mixture mixed by WC 0.52μm, (W, Ti, Ta)C 2.9μm and Co1.36μm and prepared by high-energy ball milling, changed the VC and Cr3C2 adding amount. After ball milling for 60 hours, an average particle size of 220nm powder was prepared and it was cold isostatic pressed at 300MPa and vacuum sintered at 1410°C. The physical properties and the micrographs of samples were detected. The main conclusions are as follow: the coercivity and hardness increase and Cobalt magnetic decreases with the content of Cr3C2 increasing, the transverse rupture strength (TRS) does not vary. The VC and Cr3C2 inhibit the growth of WC grain, but can’t inhibite the (W, Ti, Ta)C grain growth effectively.

scholarly journals A Study on Ni-Fe Ball Milled Spark Plasma Sintered Sample

2011 ◽  
Vol 8 (1) ◽  
pp. 157-164
Author(s):  
A. Rajadurai ◽  
Gouthama Gouthama ◽  
T Ashokkumar
Keyword(s):  
Ball Milling ◽  
Sintered Sample ◽  
High Energy ◽  
Milling Process ◽  
Average Particle ◽  
Particle Sizes ◽  
Milled Sample ◽  
Spark Plasma ◽  
Energy Ball ◽  
Temperature And Pressure

Mechanical alloying through high energy ball milling was used to produce 40wt.%Ni-Fe alloy powder of average particle sizes 80 μm and 25 μm respectively. High Energy Planetary ball milling at room temperature was performed for various time durations of 16, 32 and 64 hours. Sintering was carried on DR.SINTER.LABTM (SPS 515S) machine. Samples were sintered at constant temperature of 650°C and pressure of 30 MPa for all samples. This study exhibits in same alloy, but increases of milling hours, the densification of the sintered samples decreases and also porosity of the sample increases. This may be due to the reasons of increases in the surface area of the milled nanopowder (ie. Reduction of particle size), low green body density of long milling powders by agglomeration of powders and oxidation of powders during a milling process. However, this study revealed that in the same alloy with increasing milling hours, required more temperature and pressure for perfect densification. Densification of 85.4 % was achieved in 16 hours milled sample.

Temperature Dependence of Magnetic Properties in Ferrite Powders by High Energy Ball Milling

2014 ◽  
Vol 804 ◽  
pp. 153-156
Author(s):  
Chan Seok Hong ◽  
Yo Seung Song ◽  
Si Young Chang
Keyword(s):  
Ball Milling ◽  
Room Temperature ◽  
Sintered Sample ◽  
High Energy ◽  
Initial Permeability ◽  
High Energy Ball Milling ◽  
Nanosized Particles ◽  
Mean Size ◽  
Energy Ball ◽  
Increasing Temperature

The ferrite powders were prepared by high energy ball-milling, and subsequently compacted under a pressure of 490MPa for 3min and sintered at 1273~1673K for 3h. The spherical shaped initial powders with a mean size of approximately 70μm were changed to irregular shaped powders of 230nm in a mean size after milling at 300rpm for 3h. The milled powders were composed of the nanosized particles with a size of approximately 10nm. After compacting, the green density was approximately 70%. The sintered sample with a relative density of approximately 98% was obtained by sintering at 1473K, which showed the saturation magnetization (Ms) of approximately 90emu/g and the coercivtity (Hc) of approximately 19Oe at room temperature. The Ms decreased with increasing temperature, whereas the Hc and initial permeability (μi) were unchanged. There was no change in the Ms, Hc and μi during holding at 423K.

scholarly journals Impact Evaluation of High Energy Ball Milling Homogenization Process in the Phase Distribution of Hydroxyapatite-Barium Titanate Plasma Spray Biocoating

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 728
Author(s):  
Roberto Gómez Batres ◽  
Zelma S. Guzmán Escobedo ◽  
Karime Carrera Gutiérrez ◽  
Irene Leal Berumen ◽  
Abel Hurtado Macias ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Ball Milling ◽  
Plasma Spray ◽  
Bonding Strength ◽  
Phase Distribution ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray ◽  
Nanomechanical Properties ◽  
Energy Ball

Air plasma spray technique (APS) is widely used in the biomedical industry for the development of HA-based biocoatings. The present study focuses on the influence of powder homogenization treatment by high-energy ball milling (HEBM) in developing a novel hydroxyapatite-barium titanate (HA/BT) composite coating deposited by APS; in order to compare the impact of the milling process, powders were homogenized by mechanical stirring homogenization (MSH) too. For the two-homogenization process, three weight percent ratios were studied; 10%, 30%, and 50% w/w of BT in the HA matrix. The phase and crystallite size were analyzed by X-ray diffraction patterns (XRD); the BT-phase distribution in the coating was analyzed by backscattered electron image (BSE) with a scanning electron microscope (SEM); the energy-dispersive X-ray spectroscopy (EDS) analysis was used to determinate the Ca/P molar ratio of the coatings, the degree of adhesion (bonding strength) of coatings was determinate by pull-out test according to ASTM C633, and finally the nanomechanical properties was determinate by nanoindentation. In the results, the HEBM powder processing shows better efficiency in phase distribution, being the 30% (w/w) of BT in HA matrix that promotes the best bonding strength performance and failure type conduct (cohesive-type), on the other hand HEBM powder treatment promotes a slightly greater crystal phase stability and crystal shrank conduct against MSH; the HEBM promotes a better behavior in the nanomechanical properties of (i) adhesive strength, (ii) cohesive/adhesive failure-type, (iii) stiffness, (iv) elastic modulus, and (v) hardness properties.

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