Carbothermal Nitridation Process Of Mechanically Milled
- صفحه اصلی
- Carbothermal Nitridation Process Of Mechanically Milled
Carbothermal nitridation process of mechanically milled silica sand usiŶg TaguĐhi's ŵethod M. Mustapha, E. Abu Othman, K .Norsal, F. Mustapha, O. Mamat, S. Ramesh 1. Introduction Engineering ceramics such as silicon carbide (SiC) and Engineering ceramics such as silicon carbide (SiC) and
به خواندن ادامه دهید
Si3N4 was produced using diatomite and sucrose as silicon and carbon sources, respectively. The effect of the C/SiO2 molar ratio, heating temperature and soaking time on the morphology and phase compositions of the final products was investigated by scanning electron microscopy, x-ray diffraction analysis and energy dispersive spectroscopy. The …
به خواندن ادامه دهید
Carbothermal nitridation process of mechanically milled silica sand using Taguchi's method
به خواندن ادامه دهید
With good electrical, thermal and mechanical properties, aluminium nitride is widely used in microelectronics and other fields. However, high temperatures are still needed for the method of alumina carbothermal …
به خواندن ادامه دهید
The enhanced nitridation process for powders milled in N2 is primarily attributed to the mechanical activation, whereas for powders milled in NH3, the trapped nitrogen within the powder mixtures ...
به خواندن ادامه دهید
Microstructure control of porous Si 3 N 4 whisker scaffolds by in-situ carbothermal reduction and nitridation reaction. Author links open overlay panel Mingxing Li a b, Ran Mo a, Jie Zhou a, ... high mechanical bonding strength between adjacent whiskers, as well as the uniform pore diameter distribution of the scaffolds, CMCs with …
به خواندن ادامه دهید
This paper reported on the work performed to study the formation of silicon nitride and silicon carbide whiskers using the carbothermal nitridation process. A distinctive …
به خواندن ادامه دهید
This paper reported on the work performed to study the formation of silicon nitride and silicon carbide whiskers using the carbothermal nitridation process. A distinctive aspect of the present study lies in the use of the mechanical milling method to alter the regularity of the crystalline network of the silica sand.In order to optimise the …
به خواندن ادامه دهید
Aluminum oxynitride (AlON) powders were synthesized by the carbothermal reduction and nitridation process using commercial γ-Al 2 O 3 and carbon black powders as starting materials. And AlON transparent ceramics were fabricated by pressureless sintering under nitrogen atmosphere. The effects of ball milling time on …
به خواندن ادامه دهید
For the preparation of HECN ceramics, particularly those derived from the carbothermal reduction nitridation process, current research [24], [28] usually neglected the effects of the carbon source. Clearly, carbon source would influence the particle size and phase composition of the powder, and ultimately, the mechanical properties of the ...
به خواندن ادامه دهید
Highly porous Si 3 N 4 ceramics have been prepared via a novel carbothermal reduction-nitridation (CRN) reaction between carbon nanotubes (CNTs) and SiO vapor in a N 2 atmosphere. The green bodies consisted of 49.0 wt% CNT, 40.4 wt% α-Si 3 N 4 as seed and 10.6 wt% Y 2 O 3 as sintering additive, and SiO powders were …
به خواندن ادامه دهید
A novel and high efficiency synthesizing AlN powders method combining mechanical ball milling and DBDP has been developed.. The particle size, the crystallite size, the lattice distortion, the morphology of Al 2 O 3 powders, and the AlN conversion rate are investigated and compared under the ball milled Al 2 O 3 powders with DBDP and …
به خواندن ادامه دهید
The results show that, using the commercial Al2O3 not milled, the temperature was higher than 1600°C when the carbothermal reduction reaction was completed, but, if the Al2O3 was milled by high ...
به خواندن ادامه دهید
A distinctive aspect of the present study lies in the use of the mechanical milling "This paper reported on the work performed to study the formation of silicon nitride …
به خواندن ادامه دهید
With good electrical, thermal and mechanical properties, aluminium nitride is widely used in microelectronics and other fields. However, high temperatures are still needed for the method of alumina carbothermal reduction nitridation (CRN) for AlN preparation. Herein, thermodynamics calculation and experimental research were …
به خواندن ادامه دهید
For yielding β-SiAlON powders via carbothermal reduction and nitridation method, ... The formation of NaCl implies that the displacement reactions occur between the reacting components as a result of mechanical activation process. In Eq. (2), ... The FTIR spectra of the as-milled (a), precursor (b) and compacted powders heat treated at 1200 ...
به خواندن ادامه دهید
Carbothermal nitridation process of mechanically milled silica sand using Taguchi's method
به خواندن ادامه دهید
DOI: 10.1016/J.MATERRESBULL.2014.10.015 Corpus ID: 97260666; Synthesis of aluminum nitride powders from a plasma-assisted ball milled precursor through carbothermal reaction @article{Liu2015SynthesisOA, title={Synthesis of aluminum nitride powders from a plasma-assisted ball milled precursor through carbothermal reaction}, …
به خواندن ادامه دهید
Fig. 1 shows the XRD patterns of the as-milled powders and the reaction products obtained at 750–1300 °C for 4 h. From curve (a), TiO 2, WO 3, MoO 3, and Ta 2 O 5 could be observed obviously at mixed powders. The chromium oxides were not observed at mixed powders probably due to the trace addition of Cr 2 O 3 and the limitation of the …
به خواندن ادامه دهید
The experiments with different soaking time were carried to determine the reaction paths of VCRN process. The XRD results of products that obtained under different soaking time are presented in Fig. 1.It indicates that when the soaking time was 0.5 h, the phase compositions of the sample are Al 2 OC, Al 4 C 3, unreacted Al 2 O 3, and a little …
به خواندن ادامه دهید
Aluminum nitride (AlN) raw powder prepared by direct nitridation of metallic aluminum powder was ground by wet ball-milling in order to obtain submicron fine …
به خواندن ادامه دهید
In the present study, the influence of processing parameters on the yield formation of silicon carbide whiskers obtained from the carbothermal nitridation process using structurally altered silica sand have been optimised by employing Taguchi's …
به خواندن ادامه دهید
β-Si 3 N 4 powder was synthesized via carbothermal reduction nitridation method using quartz as starting material. The influence of synthesis temperature, C/SiO 2 molar ratio and amount of Fe 2 O 3 additive on the phase transformation and micro-morphology of β-Si 3 N 4 powder was studied. The optimum parameters for controllable …
به خواندن ادامه دهید
According to the literature [26,27], we can know that reaction (R1) V 2 O 3 + 3C + N 2 (g) = 2VN + 3CO(g) is the total equation of the process of preparing VN by carbothermal reduction nitridation of V 2 O 3. Therefore, to study the effect of pressure on the reaction temperature of vanadium xide carbothermal reduction nitridation …
به خواندن ادامه دهید
This paper reported on the work performed to study the formation of silicon nitride and silicon carbide whiskers using the carbothermal nitridation process. A distinctive …
به خواندن ادامه دهید
Carbothermal nitridation process of mechanically milled silica sand using Taguchi's method Mustapha, M.; Othman, E.; Norsal, K.; Mustapha, F.; Mamat, O.; Ramesh, S. …
به خواندن ادامه دهید
silicon carbide whiskers using the carbothermal nitridation process. A distinctive aspect of the present study lies in the use of the mechanical milling method to alter the regularity …
به خواندن ادامه دهید
Ca-α-Sialon powders was initially synthesized by carbothermal reduction-nitridation (CRN) of SiO 2, AlN, CaF 2 and carbon black at 1700 °C, subsequently was used as the raw material to prepare Ca-α-Sialon ceramic by hot-pressed (HP) sintering at 1900 °C. The main intermediate nitridated products were Si 2 N 2 O and O-Sialon …
به خواندن ادامه دهید
A series of TiN aerogels were prepared by the carbothermal reduction-nitridation method. The carbon resulted from the pyrolysis of chitosan acted as a carbon source during the carbothermal-reduction nitridation process, and TiN was obtained via the following reaction: TiO 2 +0.5N 2 +2C→TiN+2CO
به خواندن ادامه دهید
Non-oxide ceramic aerogel draws increasing attention in area of thermal insulation because of its low density, high temperature resistance and good chemical/thermal stability. Here, a BCN-TiN composite aerogel was prepared by an in-situ carbothermal reduction/nitridation method, using melamine (C3N6H6), boric acid …
به خواندن ادامه دهید
Compared to the mechanical mixing method [3, 4], the synthesized powders via this method are purer and more homogeneous [7, 8]. The sol-gel process is divided into two categories: colloidal and polymeric. The colloidal sol-gel process is based on colloidal suspension and formed by interaction of particles with each other and with solvent [9, 10 ...
به خواندن ادامه دهید
The production of α-Si 3 N 4 powder was performed by carbothermal reduction and nitridation of carbon coated fumed silica precursor. The precursor is derived from a fumed silica and a hydrocarbon gas (C 3 H 6) and provides intimate contact between the reactants.This yields a better distribution of carbon within the silica and inhibits the …
به خواندن ادامه دهید
The carbothermal reduction and nitridation of alkoxide-derived CaO SiO 2 Al 2 O 3 or Y 2 O 3 SiO 2 Al 2 O 3 mixtures was studied at 1200–1450°C. In the CaO SiO 2 Al 2 O 3 system, the formation of α-sialon was accelerated at 1450°C by the presence of a calcium-containing liquid phase. Additional heating at 1550°C for 1 h formed single …
به خواندن ادامه دهید
Nano-size aluminum nitride (AlN) powders have been successfully synthesized with a high efficiency method through annealing from milling assisted by discharge plasma (p-milling) alumina (Al2O3) precursors. The characterization of the p-milling Al2O3 powders and the synthesized AlN are investigated. Compared to conventional ball milling (c-milling), it …
به خواندن ادامه دهید
چه بخواهید با ما کار کنید و چه علاقه مند به کسب اطلاعات بیشتر در مورد محصولات ما هستید، مایلیم از شما بشنویم.