Hydrothermal Preparation of Ultrafine Monoclinic ZrO2 Powder
Abstract. Ultrafine powder of single-phase monoclinic ZrO 2 was prepared by hydrothermal treatments of amorphous hydrated zirconia with 8 wt% KF solution under 100 MPa at 200° to 500°C for 24 h. The process yielded well-crystallized particles 16 nm and 22 nm in size at 200° and 500°C, respectively. Download to read the full chapter text.
Preparation of Ultrafine β-MoO3 from Industrial Grade MoO3 Powder …
This study reports a novel strategy to obtain ultrafine metastable monoclinic molybdenum trioxide (β-MoO3) powder by the method of sublimation in the temperatures range of 1123–1373 K using the industrial grade MoO3 as raw material. The vapor-phase MoO3 could rapidly condensate and deposit in the bag filter after being quenched. It is found …
Frontiers | Preparation Technology of Ultra-Fine …
Ultrafine tungsten carbide (WC) powder refers to WC powders with a particle size between 100 and 500 nm. Researchers have improved the comprehensive properties of WC-based cemented carbides by …
Preparation of ultrafine tungsten powder by fluidized bed …
It is difficult to obtain ultrafine or nanoscale W powder for the traditional preparation technology. The main reason is that the water vapor generated during the hydrogen reduction process reacts with tungsten oxide to generate volatile WO 2 (OH) 2, which will be further reduced by hydrogen and deposited on the surface of tungsten …
Ultrafine powder coating: Smooth surface, dense structure …
This study includes preparation of both coarse and ultrafine powder coatings to compare their film surface qualities, inner structures, leveling of powder during curing and corrosion protection abilities. ... The ultrafine powder coating panel demonstrates larger modulus of resistance at 0.01 Hz (8.0×10 10 Ω cm 2) than the …
Properties,Preparation and Application of Ultrafine Powder
Ultrafine powders are the hot spot of material science to be studied in 21st century and have commendable prospects of applications as developments of preparative technology. Aim The macro-properties, preparations and some recent applications of ultrafine powder are reviewed. Methods The interrelated data domestic and abroad are summarized.
Preparation of Ultrafine W-10 Wt Pct Cu Composite Powders …
First, ultrafine pre-reduced tungsten-copper (W-Cu) powders containing a small amount of WO 2 were produced by reducing mixtures of CuWO 4 and WO 3 with …
Preparation and Characterization of Ultrafine Fish Bone Powder
ABSTRACT. Ultrafine fish bone powder (UFBP) from silver carp (Hypophthalmichthys moli trix) was prepared using dry media milling.The characteristics of UFBP were investigated by a laser particle size analyzer, Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscope (SEM), energy dispersive X-ray …
Preparation of nickel ultrafine powder and crystalline film …
DOI: 10.1016/S0254-0584(99)00015-2 Corpus ID: 94358918; Preparation of nickel ultrafine powder and crystalline film by chemical control reduction @article{Li1999PreparationON, title={Preparation of nickel ultrafine powder and crystalline film by chemical control reduction}, author={Yangming Li and Cun Li and Hui …
Preparation and dispersive mechanism of highly dispersive ultrafine …
In summary, highly dispersive ultrafine silver powder with mean size of 1.15 μm and quasi-spherical shape has been prepared by reducing silver nitrate with ascorbic acid in the presence of PVA as a dispersive agent. A PVA dispersive mechanism for preparing highly dispersive ultrafine silver powders, proved by the ultraviolet spectra, is …
Preparation of ultrafine (W,Mo)B, (W,Mo)B2.5 and …
In this study, ultrafine borides powders including (W,Mo)B, (W,Mo)B 2.5 and (Mo,W)AlB were successfully fabricated via boronizing ultrafine W-Mo solid solution composite powder with B 4 C as the boron source under the assistance of Ca melt or Al melt. Ultrafine W-Mo solid solution powder was obtained by using a two-stage …
Preparation of Ultrafine Cobalt Powder by Chemical
The preparation of ultrafine copper powder with chemical reduction method was investigated. Ascorbic acid was employed as reducing agent. Reaction of CuSO4·5H2O with ascorbic acid at 70 °C gives ...
Preparation of ultrafine nickel powder by high-energy ball …
Request PDF | On Jan 1, 2012, L.Y. Li and others published Preparation of ultrafine nickel powder by high-energy ball milling | Find, read and cite all the research you need on ResearchGate
Preparation of a high-purity ultrafine α-Al2O3 powder and
Ultrafine α-Al 2 O 3 particles with a high purity of 99.997% and an average size of 300–400 nm were successfully prepared via hydrothermal and jet-milling processes. The jet-milled Al 2 O 3 powders were coated on a conventional polyethylene (PE) separator, and the effects of the Al 2 O 3 particle size on the coating properties of the Al 2 O 3 …
Preparation and Characterization of Ultrafine Fish Bone Powder
Preparation of ultrafine fish bone powder. The frozen fish bone was thawed at room temperature, trimm ed off the connected. flesh, and then cut into pieces about 5 cm in length. The pieces were ...
Preparation of ultrafine silver coated BaTiO3 powder
The preparation of metal-ceramic composite material, silver coated BaTiO3 powder, was investigated. The shape of single particle and congeries state were studied with SEM and laser particle size ...
Preparation of ultrafine tungsten carbide powder by CVD …
Preparation of ultrafine tungsten carbide powder by CVD method from WCl6–C2H2–H2 mixtures - Volume 8 Issue 10 ... The synthesis of ultrafine tungsten carbide powder from WCl 6 –C 2 H 2-H 2 mixtures was investigated. Under most experimental conditions, a mixture of α–WC and β–W 2 C was produced. The specific surface area and ...
Preparation of ultrafine tungsten powder by fluidized bed …
This article investigated the preparation of ultrafine W powder by fluidized bed hydrogen reduction, and the apparent activation energy was determined for various …
Preparation and Application of Ultrafine Copper Powder
In electronic industry, ultrafine copper powder can be used in preparing conductive paste of multilayer ceramic capacitor (MLCC) and conductive ink. In catalysts, copper powder can...
Preparation of an ultrafine nickel powder by solid-phase reduction …
The wet chemical method used for the preparation of ultrafine nickel powder is a common liquid-phase method involving the reduction of nickel salt with hydrazine under alkaline conditions. To control the micromorphology and particle size of the nickel powder, hydroxyl compounds and surfactants are introduced on the basis of …
Mineral Ultrafine Powder Preparation Process
At present, the research of ultrafine powder mainly includes four aspects: preparation, microstructure, macroscopic properties and application, among which the …
Preparation of Ultrafine Beclomethasone Dipropionate Drug Powder …
The optimal preparation conditions for micronized HPC were obtained as follows: dropping speed of 4 mL/min, HPC solution concentration of 0.3 mg/mL, ratio of antisolvent and solvent of 5 mL/mL ...
Preparation of ultrafine/nanometer MoO2 via the hydrogen …
A more dispersed ultrafine/nano-MoO 2 powder with an average particle size of 200–700 nm could be successfully prepared at low temperatures by adjusting the reduction temperature of MoO 3, ... Currently, the most commonly used method for the preparation of molybdenum powder is the hydrogen reduction of molybdenum oxide …
Preparation of Ultrafine SiO_2 Powder from Rice Husk and …
Semantic Scholar extracted view of "Preparation of Ultrafine SiO_2 Powder from Rice Husk and Properties of Its Infrared Spectrum" by et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 217,796,511 papers from all fields of science. Search ...
Preparation and microstructure evolution of diboride ultrafine powder …
Titanium diboride ultrafine powder was prepared from sucrose, tetrabutyl titanate and boric acid by the sol–gel and microwave carbothermal reduction method. The influence of reaction temperature, ratio of Ti to C and Ti to B on the synthesis of titanium diboride was studied. The results indicated that the carbothermal temperature, the …
Preparation of ultrafine powder: the frontiers of chemical …
Summary The preparation of ultrafine powder involves many unit processes, and the significant economic and aca- demic value will prompt scientists to do further studies in this new field. All these processes have provided a new chance, as well as a challenge, for chemical engi- neering. Table 1 summarizes, in detail, the main engi- …
Preparation of Ultrafine W-10 Wt Pct Cu Composite …
We propose a process to produce ultrafine W-10 wt pct Cu composite powders by reducing the mixtures of copper tungstate (CuWO4) and tungsten trioxide (WO3) (from the calcination of a mixture of ammonium paratungstate and copper nitrate trihydrate) with carbon black and hydrogen. First, ultrafine pre-reduced tungsten-copper …
Effect of anions on preparation of ultrafine α-Al2O3 powder …
Abstract. Ultrafine alumina power was obtained by calcining the precursor at 1 200 °C for 2 h, which was prepared by homogeneous precipitation method using aluminium salts and urea as raw materials. The effects of anions on the morphology, particle size, surface area and configuration of the precursors were studied.
Preparation of ultrafine powder: the frontiers of chemical …
This paper intends to analyze the problems involved in the preparation of ultrafine powder from the point of view of chemical engineering and, based on this …
A novel method for preparing ultrafine molybdenum powder
In this study, a novel method for preparing ultrafine Mo powder is proposed, which is a combination of carbothermal reduction and hydrogen reduction. The following conclusion can be drawn: (1) Ultrafine MoO 2 particles are prepared successfully via reduction of commercial MoO 3 with carbon black at C/MoO 3 molar ratio of 0.5 to 0.7 at …