Synthesis of Ti3SiC2 Machinable Ceramics by High-Energy Milling and Hot-Pressing

2010 ◽  
Vol 105-106 ◽  
pp. 733-735
Author(s):  
Bo Bo Liu ◽  
Fen Wang ◽  
Jian Feng Zhu ◽  
Ya Ling Li
Keyword(s):  
Reaction Mechanism ◽  
Thermodynamic Analysis ◽  
Hot Pressing ◽  
Early Stage ◽  
High Energy ◽  
Starting Material ◽  
High Energy Milling ◽  
Residual Elements ◽  
Hot Pressing Sintering

The ternary layered machinable Ti3SiC2 ceramics were synthesized at 1300°C by high-energy milling and hot pressing sintering using Ti,Si and C powder as starting material. The reaction mechanism was examined by XRD, SEM and thermodynamic analysis. The results show that Ti-Si-C powders were transformed to Ti, Si and little TiSi, SiC,Ti5Si3 intermetallics by milled for 18 hours. In this process, the little Ti and C transformed to TiSi phase in early stage, and then the most of residual elements reacted to form SiC and Ti5Si3 intermetallics. Finally, Ti, Si, SiC, Ti5Si3 intermetallics and TiSi reacted to yield Ti3SiC2 by hot pressing sintering. And the sintering temperatures had a significant impact on the yielded content of Ti3SiC2 phase. Besides. The Ti3SiC2 would decompose if the temperature was high enough.

Fabrication of Layered-Ternary Ti3AlC2 Ceramics by High Energy Milling and Hot Pressing Sintering

2010 ◽  
Vol 105-106 ◽  
pp. 207-209 ◽  
Author(s):  
Jian Feng Zhu ◽  
Guo Quan Qi ◽  
Bo Bo Liu ◽  
Fen Wang
Keyword(s):  
High Temperature ◽  
Hot Pressing ◽  
Single Phase ◽  
Phase Evolution ◽  
High Energy ◽  
Bulk Ceramic ◽  
High Energy Milling ◽  
Hot Pressing Sintering ◽  
Milled Powders

Fully dense and single-phase Ti3AlC2 bulk ceramic was successfully fabricated by a high energy milling and hot-pressing with Ti, C and Al as starting materials. The details of reaction and phase evolution in high energy milling and hot pressing sintering were investigated. The results show that most of the starting materials transform to Ti-Al intermetallics and TiC in high-energy milling. The as milled powders react into Ti2AlC firstly in hot pressing sintering. When the temperature raise high enough, the Ti2AlC transform to Ti3AlC2. The content of aluminum is higher than that in the theoretical composition, which is attributing to the volatilization of Al at high temperature.

scholarly journals Fabrication of Ti3AlC2/Al2O3 nanocomposite by a novel method

2011 ◽  
Vol 43 (3) ◽  
pp. 289-294 ◽  
Author(s):  
J. Zhu ◽  
L. Ye ◽  
F. Wang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Hot Pressing ◽  
Reaction Path ◽  
Raw Materials ◽  
High Energy ◽  
Good Combination ◽  
High Energy Milling ◽  
Al2o3 Composite ◽  
Novel Method

A Ti3AlC2/Al2O3 nanocomposite was synthesized using Ti, Al, C and TiO2 as raw materials by a novel combination of high-energy milling and hot pressing. The reaction path of the 3Ti-8C-16Al-9TiO2 mixture of powders was investigated, and the results show that the transitional phases TiC, TixAly and Al2O3 are formed in high-energy milling first, and then TixAly is transformed to the TiAl phase during the hot pressing. Finally, a reaction between TiC and TiAl occurs to produce Ti3AlC2 and the nanosized Ti3AlC2/Al2O3 composite is synthesized. The Ti3AlC2/Al2O3 composite possessed a good combination of mechanical properties with a hardness of 6.0 GPa, a flexural strength of 600 MPa, and a fracture toughness (K1C) of 5.8 MPa?m1/2. The strengthening and toughening mechanisms were also discussed.

Synthesis and microstructure of layered-ternary Ti2AlC ceramic by high energy milling and hot pressing

2008 ◽  
Vol 490 (1-2) ◽  
pp. 62-65 ◽  
Author(s):  
Jianfeng Zhu ◽  
Jiqiang Gao ◽  
Jianfeng Yang ◽  
Fen Wang ◽  
Koichi Niihara
Keyword(s):  
Hot Pressing ◽  
High Energy ◽  
High Energy Milling

Synthesis of Ternary Machinable Al2O3/Ti2AlC Composites by High Energy Milling and In Situ Hot-Pressing Method

2010 ◽  
Vol 658 ◽  
pp. 169-172 ◽  
Author(s):  
Fen Wang ◽  
Bo Bo Liu ◽  
Jian Feng Zhu ◽  
Ya Ling Li
Keyword(s):  
Hot Pressing ◽  
Raw Materials ◽  
High Energy ◽  
Milling Process ◽  
Vacuum Furnace ◽  
Composite Powders ◽  
Pressing Method ◽  
Fine Grained ◽  
High Energy Milling

Al2O3/Ti2AlC composites were synthesized by high energy milling and hot-pressing at 1200°C in a vacuum furnace with a pressure of 4.8×10-2 Pa, using Ti, Al and C powder as raw materials. The effect of sintering temperature on the reactions, phase composition and microstructure of the synthesized products were investigated. The results show that the TiC and TiAl intermetallics composite powders were synthesized during the milling process. After the hot pressing, Ti2AlC phase was formed by the reaction between TiC and TiAl. A small amount of Al2O3 was also produced because of the oxidation of Al in the hot press process, which formed Al2O3/Ti2AlC composite together with the Ti2AlC at 1200°C. The fine grained Al2O3 particles disperse within Ti2AlC uniformly, which play a important role to strengthen Ti2AlC matrix, resulting in the increase of flexural strength and fracture toughness from 250 to 275.4MPa, 9.8 to 10.5MPa•m1/2, respectively.

High ZT Value of Pure SnSe Polycrystalline Materials Prepared by High-Energy Ball Milling plus Hot Pressing Sintering

2021 ◽  
Vol 13 (36) ◽  
pp. 43011-43021
Author(s):  
Xian Luo ◽  
Bowei Huang ◽  
Xiang Guo ◽  
Wenjie Lu ◽  
Guiyuan Zheng ◽  
...  
Keyword(s):  
Ball Milling ◽  
Hot Pressing ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Polycrystalline Materials ◽  
Energy Ball ◽  
Hot Pressing Sintering

Obtained of Diamond Nanometric Powders Using High Energy Milling for the Production of Alumina-Diamond Nanocomposites

2008 ◽  
Vol 591-593 ◽  
pp. 766-770 ◽  
Author(s):  
K.L. Silva ◽  
L.O. Bernardi ◽  
Makoto Yokoyama ◽  
Vania Trombini ◽  
Carlos Alberto Alves Cairo ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Diamond Powder ◽  
High Energy ◽  
Second Phase ◽  
X Ray Diffraction ◽  
High Energy Milling ◽  
Ceramics Matrix ◽  
Nanometric Particles ◽  
Hot Pressing Sintering ◽  
Nanometric Powder

The addition of nanometric particles of a second phase into ceramics matrix is one of the most recent alternatives in the development of materials with high mechanical properties and wear resistance. These nanostructured materials can be defined as systems that have at least one microstructural characteristic of nanometric dimensions (less 100nm). In this work aluminadiamond nanocomposites were produced using diamond nanometric powders obtained by high energy milling. Diamond powder was produced in the SPEX shaker/mill during 6h, with a ball-tomass ratio of 4:1. The crystallite size was 30nm. After the elimination of the Fe deriving of the contamination during the milling, and desaglomeration, this nanometric powder was added in the alumina matrix in the ratio of 5wt%. The powder densification was performed by hot pressing sintering. The obtained nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and microhardness, and they have promising characteristics regarding abrasion and wear resistance.

Microstructures and Mechanical Properties of TiAl-Based Alloys Prepared by High-Energy Ball Milling and Hot-Pressing Sintering

2011 ◽  
Vol 704-705 ◽  
pp. 828-831
Author(s):  
Tian Guo Wang ◽  
Qun Qin ◽  
Qiu Yue Shi ◽  
Wen Jun Zhang
Keyword(s):  
Mechanical Properties ◽  
Ball Milling ◽  
Hot Pressing ◽  
Room Temperature ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Uniform Microstructure ◽  
Energy Ball ◽  
Hot Pressing Sintering ◽  
The Relationship

TiAl-based alloy with a composition of Ti-47%Al-3%Cr (mole fraction) was prepared by high-energy ball milling and hot-pressing sintering. The relationship between microstructure and mechanical properties of Ti-47%Al-3%Cr alloy was studied by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and mechanical testing. The results showed that the TiAl-based alloy with high density and uniform microstructure could be obtained by high-energy ball milling and hot-pressing sintering. The compactibility and sintering densification of the element powder could be promoted efficiently by high-energy ball milling. The main phase TiAl and few phases Ti3Al were observed in the hot pressing sintering bulk samples. In addition, the microstructure changed with ball milling times, as a result, the mechanical properties changed with the microstructure. The finer the microstructure was, the higher the strength at room temperature became. After the element powder was milled for 20 hours and hot-pressing sintered at 1300 °C for 2 hours, TiAl-based alloys were found to have good room temperature mechanical properties with the compressive strength of 2870 Mpa and the relative compressive ratio of 27.3%. Keywords: TiAl-based alloys; hot-pressing sintering; microstructure; mechanical properties

Impact of the SiC addition on the morphological, structural and mechanical properties of Cu-SiC composite powders prepared by high energy milling

2021 ◽  
Author(s):  
Nailton T. Câmara ◽  
Rafael A. Raimundo ◽  
Cleber S. Lourenço ◽  
Luís M.F. Morais ◽  
David D.S. Silva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Energy ◽  
Composite Powders ◽  
High Energy Milling
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