A Liquid-Phase Precipitation Process for Selective Removal of Critical Inorganic Species from the Hanford Waste Streams

2006 ◽  
Vol 23 (2) ◽  
pp. 296-308 ◽  
Author(s):  
M.S.H. Bader
Keyword(s):  
Liquid Phase ◽  
Selective Removal ◽  
Precipitation Process ◽  
Phase Precipitation ◽  
Waste Streams ◽  
Inorganic Species

Study on Preparation of SnO2 Polyacrylate Thermal Insulation Film with Liquid Phase Precipitation Process

2014 ◽  
Vol 887-888 ◽  
pp. 762-765
Author(s):  
Hong Kai Zhao ◽  
Hong Li Wang
Keyword(s):  
Liquid Phase ◽  
Thermal Insulation ◽  
Ph Value ◽  
Precursor Solution ◽  
Development Trend ◽  
Modern World ◽  
Precipitation Process ◽  
Low Carbon ◽  
Organic Film ◽  
Phase Precipitation

In the modern world, the theme of low carbon economic development trend advocates energy conservation and discharge reduction, and the energy-saving technology of thermal insulation film of automobile glass and construction glass has attracted increasing more attention. This paper adopts liquid phase precipitation process to prepare nanoSnO2 polyacrylate thermal insulation organic film: first, select precursor solution concentration in favor of generating outphase precipitation and pH value to prepare SnCl4 solution with low concentration 2 mM-10 mM, and hydrochloric acid with concentration 0.1 M-0.4 M; select methyl methacrylate 34.5%-90%, BA 10%-35.5%, MAA 0%-30% and AIBN 0.1%-0.3% to prepare polyacrylate film; put the prepared PA film in SnCl solution, control reaction temperature to be 40°C-80°C, maintain reaction time 6-18h, take out the film, wash and dry to get nanoSnO2organic thermal insulation film. According to XRD analysis and SEM observation, SnO2 is uniformly deposited on the surface of organic film, having good thermal insulation performance.

Effect of WC Addition on Phase Formation and Microstructure of TiC-Ni Composites

2008 ◽  
Vol 55-57 ◽  
pp. 353-356
Author(s):  
Nawarat Wora-uaychai ◽  
Nuchthana Poolthong ◽  
Ruangdaj Tongsri
Keyword(s):  
Liquid Phase ◽  
Tungsten Carbide ◽  
Phase Formation ◽  
Liquid Phase Sintering ◽  
Precipitation Process ◽  
Solid Solution Phase ◽  
Binder Phase ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
X Ray

In this research, titanium carbide-nickel (TiC-Ni) composites, with tungsten carbide addition, were fabricated by using a powder metallurgy technique. The TiC-Ni mixtures containing between 0-15 wt. % tungsten carbide (WC), were compacted and then sintered at 1300°C and 1400°C, respectively. The phase formation and microstructure of the WC-added TiC-Ni composites have been investigated by X-ray diffraction and scanning electron microscopy techniques. Mechanical properties of these composites were assessed by an indentation technique. The X-ray diffraction patterns showed no evidence of tungsten rich phases in the sintered WC-added cermets. This indicates that during the sintering process, tungsten carbide particles were dissolved in metallic binder phase (Ni phase) via dissolution/re-precipitation process during liquid phase sintering. The liquid phase formed during sintering process could improve sinterability of TiC-based cermets i.e., it could lower sintering temperatures. The TiC-Ni composites typically exhibited a core-rim structure. The cores consisted of undissolved TiC particles enveloped by rims of (Ti, W)C solid solution phase. Hardness of TiC-Ni composites increased with WC content. Sintering temperature also had a slight effect on hardness values.

scholarly journals Effects of Liquid Phase Cloud Microphysical Processes in Mixed Phase Cumulus Clouds over the Tibetan Plateau

2019 ◽  
Author(s):  
Xiaoqi Xu ◽  
Chunsong Lu ◽  
Yangang Liu ◽  
Wenhua Gao ◽  
Yuan Wang ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Tibetan Plateau ◽  
Large Scale ◽  
Precipitation Event ◽  
The Tibetan Plateau ◽  
Phase Precipitation ◽  
Physical Reason ◽  
Surface Precipitation ◽  
Skill Scores ◽  
Microphysical Processes

Abstract. Overprediction of precipitation over the Tibetan Plateau is often found in numerical simulations, which is thought to be related to coarse grid sizes or inaccurate large-scale forcing. In addition to confirming the important role of model grid sizes, this study shows that liquid-phase precipitation parameterization is another key culprit, and underlying physical mechanisms are revealed. A typical summer plateau precipitation event is simulated with the Weather Research and Forecasting (WRF) model by introducing different parameterizations of liquid-phase microphysical processes into the commonly used Morrison scheme, including autoconversion, accretion, and entrainment-mixing mechanisms. All simulations can reproduce the general spatial distribution and temporal variation of precipitation. The precipitation in the high-resolution domain is less overpredicted than in the low-resolution domain. The accretion process plays more important roles than other liquid-phase processes in simulating precipitation. Employing the accretion parameterization considering raindrop size makes the total surface precipitation closest to the observation which is supported by the Heidke skill scores. The physical reason is that this accretion parameterization can suppress fake accretion and liquid-phase precipitation when cloud droplets are too small to initiate precipitation.

The Simulation of Stress-Induced Phase Transition of L10 Re-Precipitation Based on Microscopic Phase-Field Model

2011 ◽  
Vol 689 ◽  
pp. 226-234
Author(s):  
Yong Xin Wang ◽  
Yong Biao Wang ◽  
Zheng Chen ◽  
Yan Li Lu
Keyword(s):  
Phase Transition ◽  
Induction Period ◽  
Phase Field ◽  
Field Model ◽  
Large Range ◽  
Phase Field Model ◽  
Precipitation Process ◽  
Phase Precipitation ◽  
Microscopic Phase Field Model ◽  
Precipitation Phase

It is common that the pre-precipitation phase with kinetics advantage is found during non-equilibrium transformation. The continuously changed stress in the transformation increases the complication of precipitation process. The stress induces Ll0pre-precipitation phase in Ni75-Al12.5-V12.5alloy is studied by microscope phase-field model in this paper. It is particularly show that Ll2phase precipitates directly without stress. There is no Ll0phase to be found in the disordered matrix. Oppositely, Ll0phase precipitates firstly with stress, and then it turns into Ll2phase. When stress is less, either or both above situations are observed. While stress is stronger, a large range of Ll0phase precipitates firstly. Then a part of it dissolves. The rest turns into Ll2phase. The precipitation of pre-precipitation phase accelerates the precipitation process. The larger the stress and the more Ll0phase precipitation, the longer it exists and the shorter the induction period is.

Phase-Field Simulation of δ-Ni2Si Precipitation in Cu-Ni-Si Alloys

2011 ◽  
Vol 689 ◽  
pp. 184-189
Author(s):  
Yong Qiang Long ◽  
Ping Liu ◽  
Yong Liu
Keyword(s):  
Phase Field ◽  
Interfacial Energy ◽  
Elastic Energy ◽  
Phase Field Model ◽  
Precipitation Process ◽  
Phase Precipitation ◽  
Coarsening Behavior ◽  
Δ Phase ◽  
Energy Anisotropy ◽  
Precipitation Phase

The phase-field model is established for precipitation transformations in multi-component alloy, which incorporates the interfacial energy and elastic energy anisotropy. The mechanism of the precipitation phase transition is revealed by means of the simulation of δ-phase precipitation process in Cu-4.0at.%Ni-2.0at.%Si alloy, and furthermore, the δ-phase precipitation kinetics is built at the temperature of 450°C. Under the influence of both interfacial energy and elastic energy anisotropy, δ-Ni2Si is presented in disc-shaped precipitates. The simulation patterns show that when one precipitate hits another precipitate with a different orientation, it stops growing, consequently forming a “T”-shape precipitate configuration. When two precipitates with the same orientations grow and hit each other, they connect or coarsen only if the spacing between the precipitates is very small. Therefore, the coarsening behavior of disc-shaped precipitate should be completely different from that of spherical precipitates.

The Effect of Pore-Formers on the Performance of YSZ/NiO Composite Material

2012 ◽  
Vol 624 ◽  
pp. 186-189
Author(s):  
Zhong Zhou Yi ◽  
Hong Yan Sun ◽  
Yi Ming Liu ◽  
Feng Rui Zhai
Keyword(s):  
Composite Material ◽  
Liquid Phase ◽  
Composite Ceramic ◽  
Precipitation Process ◽  
Corn Meal ◽  
Composite Powders ◽  
Pore Former ◽  
Gel Casting ◽  
Different Types ◽  
Co Precipitation

YSZ/NiO composite powders were successfully synthesized by chemical liquid phase co-precipitation process. YSZ/NiO composite ceramic bodies were prepared by gel casting. Three different types and amounts of pore-formers were added into the YSZ/NiO suspension. The results show that the YSZ/NiO composite with the best properties and optimal porosity of 42.18% was obtained when the 7wt.% corn meal was used as pore-former.

scholarly journals HREM imaging of single unit cell carbide precipitates in Pt-C alloys

1991 ◽  
Vol 49 ◽  
pp. 572-573
Author(s):  
M.J. Witcomb ◽  
U. Dahmen ◽  
M.A. O'Keefe ◽  
K.H. Westmacott
Keyword(s):  
Calcium Fluoride ◽  
Single Unit ◽  
Single Layer ◽  
Precipitation Process ◽  
Precipitate Phase ◽  
Precipitation Sequence ◽  
Phase Precipitation ◽  
Interstitial Solid Solution ◽  
Cu Alloys ◽  
Essential Function

Dilute Pt-C alloys are prototypical for studying oversize carbide phase precipitation from interstitial solid solution. Earlier studies showed the essential function of quenched-in vacancies in the precipitation process. Vacancies play a dual, volume accommodation and structural, role in the transformation by modifying both the habit plane spacing and stacking sequence. It was also shown how the precipitation sequence in interstitial Pt-C alloys is analogous to that in substitutional Al-Cu alloys. Initially a “GP zone” consisting of a monolayer plate of carbon atoms and vacancies forms. Atomic resolution images of the socalled a precipitates have confirmed their structure. During subsequent coarsening of the precipitates, α’ platelets form. Schematic diagrams illustrating the α and α’ structures in <100> projection are given in Fig. 1. The single-layer a structure, or GP zone is identical to a ﹛100﹜ stacking fault stabilized by an intercalation of carbon. The two-layer α’ structure is the first true precipitate phase and has a crystal structure anti-isomorphous with calcium fluoride.

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