| 1. |
- Akhtar, Farid, et al.
(författare)
-
Reactive sintering and properties of TiB 2 and TiC porous cermets
- 2008
-
Ingår i: Materials letters (General ed.). - : Elsevier BV. - 0167-577X .- 1873-4979. ; 62:8-9, s. 1242-1245
-
Tidskriftsartikel (refereegranskat)abstract
- TiB2, TiC reinforced Fe matrix porous cermets were produced through the synthesis reaction of Ti, C and FeB powders with 30% sintered porosity. The X-ray diffraction analysis confirmed the completion of reaction. The TiB2, TiC and Fe were detected by X-ray diffraction analysis. The formation of secondary reaction products was inhibited during the reactive sintering. Porous cermets showed large and small pores in their structure. Maximum bending strength of 163 MPa was obtained with 30% sintered porosity. Furthermore, the fabricated samples were found to possess reasonable electrical conductivities, thus rendering them suitable for use as the basic components of planar solid oxide fuel cells.
|
|
| 2. |
- Akhtar, Farid, et al.
(författare)
-
TiB 2 and TiC stainless steel matrix composites
- 2007
-
Ingår i: Materials letters (General ed.). - : Elsevier BV. - 0167-577X .- 1873-4979. ; 61:1, s. 189-191
-
Tidskriftsartikel (refereegranskat)abstract
- Stainless steel matrix composites reinforced with TiB2 or TiC particulates have been in situ produced through the reactive sintering of Ti, C and FeB. X-ray diffraction analysis confirmed the completion of reaction. The TiB2, TiC and steel were detected by X-ray diffraction analysis. No other reaction product or boride was found, indicating the stability of TiB2 and TiC in steel matrix. The SEM micrographs revealed the morphology and distribution of in situ synthesized TiB2 and TiC reinforcements in steel matrix. During sintering the reinforcements TiB2 and TiC grew in different shapes. TiB2 grew in hexagonal prismatic and rectangular shape and TiC in spherical shape.
|
|
| 3. |
- Askari, SJ, et al.
(författare)
-
Synthesis and characterization of nano-crystalline CVD diamond film on pure titanium using Ar/CH 4/H 2 gas mixture
- 2007
-
Ingår i: Materials letters (General ed.). - : Elsevier BV. - 0167-577X .- 1873-4979. ; 61:11-12, s. 2139-2142
-
Tidskriftsartikel (refereegranskat)abstract
- Titanium and Ti alloys have poor tribological properties and deposition of a well adherent diamond coating is a promising way to solve this problem. But diamond film deposition on pure titanium and Ti alloys is always difficult due to the high diffusion coefficient of carbon in Ti, the large mismatch in their thermal expansion coefficients, the complex nature of the interlayer formed during diamond deposition, and the difficulty of achieving very high nucleation density. A nano-crystalline diamond (NCD) film can resolve Ti and Ti alloys weak tribological performance due to its smooth surface. A well-adhered NCD film was successfully deposited on pure Ti substrate by using a microwave plasma assisted chemical vapor deposition (MWPCVD) system in the environment of Ar, CH4 and H2 gases at a moderate temperature. Detailed experimental results on the preparation, characterization and successful deposition of the NCD film on pure Ti are discussed
|
|
| 4. |
- Hedström, Peter, et al.
(författare)
-
Elastic strain evolution and ε-martensite formation in individual austenite grains during in situ loading of a metastable stainless steel
- 2008
-
Ingår i: Materials letters (General ed.). - : Elsevier BV. - 0167-577X .- 1873-4979. ; 62:2, s. 338-340
-
Tidskriftsartikel (refereegranskat)abstract
- The (hcp) ε-martensite formation and the elastic strain evolution of individual (fcc) austenite grains in metastable austenitic stainless steel AISI 301 has been investigated during in situ tensile loading up to 5% applied strain. The experiment was conducted using high-energy X-rays and the 3DXRD technique, enabling studies of individual grains embedded in the bulk of the steel. Out of the 47 probed austenite grains, one could be coupled with the formation of ε-martensite, using the reported orientation relationship between the two phases. The formation of ε-martensite occurred in the austenite grain with the highest Schmid factor for the active {111}b12¯1N slip system.
|
|
| 5. |
|
|
| 6. |
- Ma, M. G., et al.
(författare)
-
A facile solvothermal route to synthesis of gamma-alumina with bundle-like and flower-like morphologies
- 2009
-
Ingår i: Materials Letters. - : Elsevier BV. - 1873-4979 .- 0167-577X. ; 63:11, s. 881-883
-
Tidskriftsartikel (refereegranskat)abstract
- Boehmite with bundle-like morphology assembled from nanofibres has been successfully synthesized by solvothermal method from AlCl3 center dot 6H(2)O in ethylene glycol (EG) at 200 degrees C for 10 h. Using 1,4-Butanediol instead of EG, the Al-11(OH)(30)Cl-3 with flower-like morphology assembled from nanosheets was obtained at 200 degrees C for 6 h. The gamma-alumina with similar morphology was obtained by thermal decomposition of the boehmite or Al-11(OH)(30)Cl-3 at 500 degrees C for 3 h in air. The products were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectrometry (FTIR), transmission electron microscopy (TEM), and thermogravimetric analysis (TG). The method is simple and does not need any surfactant or template or base. (C) 2009 Elsevier B.V. All rights reserved.
|
|
| 7. |
- Ma, M. G., et al.
(författare)
-
Hydrothermal-polyol route to synthesis of beta-Ni(OH)(2) and NiO in mixed solvents of 1,4-butanediol and water
- 2009
-
Ingår i: Materials Letters. - : Elsevier BV. - 1873-4979 .- 0167-577X. ; 63:21, s. 1791-1793
-
Tidskriftsartikel (refereegranskat)abstract
- The beta-Ni(OH)(2) with flower-like morphology assembled from nanosheets has been successfully synthesized by a hydrothermal-polyol method from Ni(CH3COO)(2)center dot 4H(2)O in mixed solvents of 1,4-butanediol and water at 200 degrees C for 24 h. The NiO with similar morphology was obtained by a simple thermal decomposition of the precursor (beta-Ni(OH)(2)) at 400 degrees C for 3 h in air. The products were characterized by X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), thermogravimetric analysis (TG) and differential scanning calorimetric analysis (DSC). We expect that this hydrothermal-polyol method may be extended to the preparation of nanostructures of other kinds of metal oxides. (C) 2009 Elsevier B.V. All rights reserved.
|
|
| 8. |
- Ma, Ming-Guo, et al.
(författare)
-
Hydrothermal synthesis and characterization of CePO4/C core-shell nanorods
- 2009
-
Ingår i: Materials letters (General ed.). - : Elsevier B.V.. - 0167-577X .- 1873-4979. ; 63:28, s. 2513-2515
-
Tidskriftsartikel (refereegranskat)abstract
- The CePO4/C nanocomposite with core-shell nanostructure has been successfully synthesized using glucose and CePO4 by a facile and simple hydrothermal method at 160 °C for 24 h. The new material consists of a monoclinic CePO4 core and an amorphous-C shell. The TEM micrograph indicated that the CePO4/C nanocomposite was core-shell nanorods. The effects of glucose concentration on the C shells and luminescent intensity of CePO4/C nanocomposite were investigated. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL). This method is simple, low-cost and does not need any surfactant.
|
|
| 9. |
|
|
| 10. |
|
|
