Fabrication of Sintered Compact of Fe-TiB2 Composites by Pressureless Sintering of (FeB+TiH2) Powder Mixture

2016 ◽  
Vol 23 (4) ◽  
pp. 282-286 ◽  
Author(s):  
Xuan-Khoa Huynha ◽  
◽  
Ji Soon Kim
Keyword(s):  
Powder Mixture ◽  
Pressureless Sintering ◽  
Sintered Compact ◽  
Tih2 Powder

Effect of TiO2 and TiB2 on Pressureless Sintering of B4C

2012 ◽  
Vol 727-728 ◽  
pp. 1022-1027
Author(s):  
Rosa Maria da Rocha ◽  
Francisco Cristóvão Lourenço de Melo
Keyword(s):  
Powder Mixture ◽  
Vickers Hardness ◽  
Argon Atmosphere ◽  
Second Phase ◽  
Pressureless Sintering ◽  
Reactive Sintering ◽  
Concentration Increase ◽  
In Situ Formation ◽  
Equiaxed Grains

This paper presents results of experiments on pressureless sintering of boron carbide (B4C) with addition of titânia (TiO2) and titanium diboride (TiB2). The TiB2powder was added as a second phase and the TiO2powder for reactive sintering and in-situ formation of TiB2. The final concentrations of TiB2in the composites were 0 to 10 vol%. Sintering was performed at 2050 °C/30min in argon atmosphere. TiO2was completely transformed into TiB2with fine equiaxed grains distributed homogeneously. Composites obtained by in-situ reaction showed a densification increase with the concentration increase, while the composites with TiB2powder mixture showed low densification in all compositions. Relative Density of the composite with 10 vol% of TiB2obtained in-situ was 91% (TD) compared to 86 % for B4C only. Vickers hardness was about 29 GPa.

scholarly journals Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 635
Author(s):  
Mengjie Yan ◽  
Fang Yang ◽  
Boxin Lu ◽  
Cunguang Chen ◽  
Yanli Sui ◽  
...  
Keyword(s):  
Relative Density ◽  
Tial Alloy ◽  
Sintering Temperature ◽  
Low Cost ◽  
Hot Isostatic Pressing ◽  
Duplex Structure ◽  
Sintered Compact ◽  
High Relative Density ◽  
Tih2 Powder ◽  
Al Powder

Preparing high relative density γ-TiAl alloy by pressure-less sintering at low-cost has always been a challenge. Therefore, a new kind of non-spherical pre-alloyed TiAl powder was prepared by the reaction of TiH2 powder and Al powder at 800 °C to fabricate high-density Ti-48Al alloy via pressure-less sintering. The oxygen content was controlled to below 1800 ppm by using coarse Al powder (~120 μm). The sintered densities ranged from 92.1% to 97.5% with sintering temperature varying from 1300 °C to 1450 °C. The microstructure of the sintered compact was greatly influenced by the sintering temperature. The as-sintered samples had a near-γ structure at 1350 °C, a duplex structure at 1400 °C, and a nearly lamellar structure at 1450 °C. To achieve full densification, non-capsule hot isostatic pressing was performed on the 1350 °C and 1400 °C sintered samples. As a result, high compressive strengths of 2241 MPa and 1931MPa were obtained, which were higher than the existing Ti-48Al alloys.

Revealing dehydrogenation effect and resultant densification mechanism during pressureless sintering of TiH2 powder

2021 ◽  
Vol 873 ◽  
pp. 159792
Author(s):  
T. Chen ◽  
C. Yang ◽  
Z. Liu ◽  
H.W. Ma ◽  
L.M. Kang ◽  
...  
Keyword(s):  
Pressureless Sintering ◽  
Densification Mechanism ◽  
Tih2 Powder

Microstructural Study of Diamond Deformed Under High Pressure and Temperature

1985 ◽  
Vol 43 ◽  
pp. 230-231
Author(s):  
E. F. Koch
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Lattice Structure ◽  
Diamond Particle ◽  
Polycrystalline Diamond ◽  
Sintering Process ◽  
Ion Milling ◽  
Sintered Compact ◽  
Transmission Electron ◽  
High Pressure Sintering

Because of the extremely rigid lattice structure of diamond, generating new dislocations or moving existing dislocations in diamond by applying mechanical stress at ambient temperature is very difficult. Analysis of portions of diamonds deformed under bending stress at elevated temperature has shown that diamond deforms plastically under suitable conditions and that its primary slip systems are on the ﹛111﹜ planes. Plastic deformation in diamond is more commonly observed during the high temperature - high pressure sintering process used to make diamond compacts. The pressure and temperature conditions in the sintering presses are sufficiently high that many diamond grains in the sintered compact show deformed microtructures.In this report commercially available polycrystalline diamond discs for rock cutting applications were analyzed to study the deformation substructures in the diamond grains using transmission electron microscopy. An individual diamond particle can be plastically deformed in a high pressure apparatus at high temperature, but it is nearly impossible to prepare such a particle for TEM observation, since any medium in which the diamond is mounted wears away faster than the diamond during ion milling and the diamond is lost.

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