scholarly journals Permeable ceramics filled with the threefraction electrofused corundum and the porcelain bond

2018 ◽  
pp. 24-27 ◽  
Author(s):  
A. V. Belyakov ◽  
Zo E Mo U ◽  
N. A. Popova ◽  
Ye Aung Min
Keyword(s):  
Ultimate Strength ◽  
Open Porosity ◽  
Gas Permeability ◽  
Raw Material ◽  
Permeable Material ◽  
Permeability Factor ◽  
Porous Permeable Material

By means of the raw material grading the porous permeable material was prepared with the electrofused corundum with the porcelain PFL-1 bond. The samples with improved properties were obtained when introducing in the mass of 5 weigh percent of porcelain bond (above 100 % of the fller) after the burning at 1450 оC. Their ultimate strength at bending was 14,6 MPa, the open porosity was 44 % and the gas permeability factor was 0,85 micron2. Ref. 10. Tab. 3.

scholarly journals The Structure Analytical Research of Porous Permeable Wire Material

2016 ◽  
Vol 22 (2) ◽  
pp. 81-88
Author(s):  
Andrzej Jakubowski ◽  
Renata Crasto
Keyword(s):  
Structural Characteristics ◽  
Optimal Number ◽  
Permeable Material ◽  
Wire Material ◽  
Deformation Processes ◽  
Single Fragment ◽  
Porous Permeable Material ◽  
Analytical Research ◽  
Diameter Reduction ◽  
Deformation Treatment

Abstract The details of making technology of porous permeable material with use of wire are allowed to carry out the analytical research of structure and structural characteristics of wire winding body. Its permit for prognostication the final properties of material, that is produced by the following deformation treatment (diameter reduction). Due to the regular organized arrangement of wire, the coil of winding body is considered as a multispan continuous beam, but a contact of coils - as interaction of two cylinders. Possibility of exactly calculation of the contacts between coils is allowed to go over the single fragment displacements into deformation of whole winding body. During research of deformation processes in regards of winding body geometry and used wire mechanical properties, the structural characteristics of porous permeable wire material are expected. The optimal number of winding layers, eliminating the distortion of organized final structure, is established. The material pressure-compactness relation is obtained in order to control the technological conditions of winding and drafting for guarantee the product required properties.

An investigation on the permeability of different wood furnish materials

Holzforschung ◽  
2008 ◽  
Vol 62 (2) ◽  
pp. 215-222 ◽  
Author(s):  
Heiko Thoemen ◽  
André Klueppel
Keyword(s):  
Hot Pressing ◽  
Gas Permeability ◽  
Core Layer ◽  
Raw Material ◽  
Cross Sectional ◽  
Wood Particles ◽  
Order Of Magnitude ◽  
Lower Permeability ◽  
Size Of Particles ◽  
Wood Based Composite

Abstract In wood-based composite mats, mass and heat transfer are substantially influenced by their gas permeability. Thus, reliable permeability data are needed if one wants to model and simulate those processes taking place prior, during, and after hot-pressing operations of the mat. In this study, wood particles of surface and core layer type were obtained from two particleboard manufacturers, using impact mills and knife ring flakers, respectively. The permeability measurements were performed on the initial materials, as well as on subsets of it obtained by laboratory sieving. Additionally, medium density fibreboard (MDF) fibres from three species, namely pine (Pinus sylvestris), spruce (Picea abies) and rubberwood (Hevea Brasiliensis) were investigated. Cross-sectional and within-plane permeability was measured for densities from 250 to 1000 kg m-3. The permeability of the core particle materials was determined on solidified samples. On the other hand, the surface particles and MDF fibres were investigated by means of a rapid testing method on loose furnish materials (without solidification). MDF mats exhibited lower permeability values than particle mats at low densities, but values were found in the same order of magnitude for high densities. Mainly, the small particles determine the pore structure and permeability of particle mats. Thickness and in-plane size of particles affect the mat permeability, with the in-plane size becoming primarily effective at elevated densities. The permeability of MDF fibre mats depends more on the anatomy of the raw material than on its size distribution. We suggest, based on computer simulations, that only the within-plane permeability has a strong effect on gas pressure and temperature conditions during hot pressing. The cross-sectional permeability does not play an essential role in this regard.

Fabrication and Properties of Porous Anorthite⁄Mullite Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 590-595 ◽  
Author(s):  
Ya Mei Lin ◽  
Cui Wei Li ◽  
Feng Kun Yang ◽  
Chang An Wang
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Open Porosity ◽  
Raw Material ◽  
Composite Ceramics ◽  
Porous Composite ◽  
Mullite Phase ◽  
Powder Content ◽  
Mullite Powder ◽  
Mullite Ceramics

Porous anorthite/mullite composite ceramics with different mullite content were fabricated by foam-gelcasting, using CaCO3, SiO2, α-Al2O3as raw material for anorthite phase and mullite powder for mullite phase. Effects of mullite powder content on bulk density, porosity, compressive strength and thermal conductivity of the porous composite ceramics were researched. It has been shown that mullite powder content has great effect on microstructure and properties of the porous anorthite⁄mullite composite ceramics. The open porosity of the prepared porous anorthite⁄mullite composite ceramics is in the range of 58.7 %~77.5 %, the compressive strength is between 4.2 and 30.9 MPa, and the thermal conductivity is in the range of 0.18 ~1.47 W⁄(m·K).

scholarly journals Development of a Methodological Approach to Identifying Petrophysical Types of Complicated Carbonate Rocks According to Laboratory Core Studies

2021 ◽  
Vol 21 (3) ◽  
pp. 109-116
Author(s):  
Aleksandr V. Raznicyn ◽  
Ivan S. Putilov
Keyword(s):  
Open Porosity ◽  
Carbonate Rocks ◽  
Gas Permeability ◽  
Methodological Approach ◽  
Full Description ◽  
Extensive Literature ◽  
Void Space ◽  
Thin Sections ◽  
Hydrocarbon Reservoir ◽  
The Absolute

Petrophysical typification of productive hydrocarbon deposits is one of the main stages of building a petrophysical model of a reservoir. For carbonate reservoirs characterized by a heterogeneous complex structure of the void space, the problem of identifying petrotypes is very relevant. An extensive literature review of existing methods of petrophysical typification showed that the most well-known and widely used of them were based on simple theoretical models of the structure of the void space of rocks, which did not allow a full description of complex carbonate deposits. Moreover, the petrotypes identified on the basis of these methods did not agree with the results of microdescription of thin sections. A new methodological approach to the identification of petrophysical types of complex carbonate rocks was proposed, based on the integration of the results of standard (determination of the absolute gas permeability and open porosity coefficients) and special (nuclear magnetic resonance studies) core studies and data obtained in the lithological description of thin sections. The developed approach took into account the main petrophysical properties of rocks that characterize its reservoir potential, as well as the structural features of the void space and the influence of secondary transformations. The proposed methodological approach was applied to distinguish petrophysical types in the section of the Assel-Sakmara deposits of the Yareyuskoye field: six petrotypes were identified and described in detail, combined into four zones (zone of development of healed fracturing, zone of development of leaching, zone of development of leaching and open fracturing, zone of development open fracturing), for each of them, individual dependences of the absolute gas permeability coefficient on the open porosity coefficient and the Leverett J-function on the water saturation coefficient were constructed. The information obtained would allow a differentiated approach to geological and hydrodynamic modeling of a hydrocarbon reservoir.

scholarly journals Failure Analysis Of Water Pump Shaft

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Didik Ariwibowo
Keyword(s):  
Tensile Stress ◽  
Failure Analysis ◽  
Ultimate Strength ◽  
Raw Material ◽  
Water Pump ◽  
Foreign Material ◽  
Material Identification ◽  
Pump Shaft ◽  
Strength Material ◽  
The Difference

Abstract- A water pump shaft for utility water raw material was failed. The shaft was broken into two parts. While in dismantling, the sand was found in chamber between bearing and shaft. There was also a bolt in the impeller. According to reports, the pump has been repaired and since there was no replacement shaft but the shaft was reused in reverse position. There was no inspection of the shaft when it was disconnected by operational reasons. The failure analysis of the broken-shaft was performed to investigate the cause of the failure. Two inspection and analysis were perfomed those are visual inspection and material identification and analysis. When material analysis of the shaft was carried out there was difference between examination and data specification of the shaft.The material identification indicate that the material was AISI SS 304 whereas specification data states SS 316. Both materials have similar tensile stress, so the difference was not the contributor of the failure. The present of foreign material was consider as the cause of the failure. The foreign material caused to stucked on rotation of shaft and increasing in tensile of the shaft over its ultimate strength. Keywords – vertical pump, tensile stress, ultimate strength, material identification  

scholarly journals Application of complex radiation and refrigeration technology for antiseptic treatment and preservation of the quality of mushrooms

2020 ◽  
Vol 82 (3) ◽  
pp. 58-64
Author(s):  
N. S. Shishkina ◽  
O. V. Karastoyanova ◽  
N. I. Fedyanina ◽  
N. V. Korovkina
Keyword(s):  
Gaseous Medium ◽  
Gas Permeability ◽  
Raw Material ◽  
Technological Parameters ◽  
Accelerated Electrons ◽  
Biaxially Oriented Polypropylene ◽  
Antiseptic Treatment ◽  
Oriented Polypropylene ◽  
Physical Processing

The use of effective physical processing methods to preserve food and agricultural products is gaining more and more popularity every year. This article presents a complex technology, including processing by accelerated electrons with doses of 1–3 kGy at a beam energy of 5 MeV. The efficiency of application of processing with accelerated electrons and modification of the composition of the gaseous medium for optimization of the technology of refrigerated storage of champignon mushrooms has been investigated. The technology parameters have been established to ensure microbiological safety and preservation of the consumer qualities of mushrooms under production conditions. The treatment with accelerated electrons at doses of 1–3 kGy in combination with cooling and modification of the composition of the gaseous medium delayed the postharvest maturation processes and led to an increase in the storage time of mushrooms up to 20 days (control 10–14 days). The modification of the composition of the gaseous medium was ensured by the selective gas permeability of the used packaging material (polypropylene, polyethylene, biaxially oriented polypropylene) and the respiration of the raw material. Depending on the intended purpose of the product - fresh sale or further processing (drying, freezing, etc.), the technology under consideration, due to the differentiated choice of technological parameters of storage and processing, allows to control changes in organoleptic, physicochemical and microbiological indicators of the quality of mushrooms in a targeted manner. Packaging made of biaxially oriented polypropylene and polypropylene should be used for mushrooms for processing, due to the best preservation of the structure of plant tissue, as a result of slowing down the ripening processes and delaying aging and spoilage, for the sale of fresh mushrooms, it is most effective to use polyethylene packaging.

Structural ultimate strength analysis of a first stage fan blade in a turbine jet engine RD-33

2016 ◽  
Vol 232 (1) ◽  
pp. 77-84 ◽  
Author(s):  
Adam Kozakiewicz ◽  
Stanisław Kachel ◽  
Stanisław Jóźwiak ◽  
Przemysław Jóźwiak
Keyword(s):  
Ultimate Strength ◽  
Strength Properties ◽  
Raw Material ◽  
Strength Analysis ◽  
Material Structure ◽  
Jet Engine ◽  
Emergency Situations ◽  
Typical Material ◽  
Fan Blade ◽  
Material Conditions

Statistical data clearly points out compressor train outage as one of the main reasons for the breakdown of aircraft power units. Outages are caused by various factors, including material conditions as the main one. Therefore, structural ultimate strength analysis of constructional raw material properties used in the production process of such an important part of an engine is not only of tremendous significance during the designing phase but also in a research phase and expertise associated with emergency situations. Considering the above-mentioned factors the article presents the outcomes of chemical composition, morphology, and phase structure of metallic material used to produce first row fan blades of RD-33 turbine jet engine, which is (currently) used by the Polish Air Force. Apart from typical material structure analysis, also the basic mechanical strength properties of materials have been determined including hardness, tensile, and impact tests. These may now constitute the basis for the analysis of substitute materials selection allowing the production of analyzed engine part.

Separation of Gases by Nanoporous Ceramics

2012 ◽  
Vol 7 (2) ◽  
pp. 39-42
Author(s):  
Vladimir Lysenko ◽  
Dmitriy Trufanov ◽  
Sergey Bardakhanov
Keyword(s):  
Electron Beam ◽  
Specific Surface ◽  
Separation Factor ◽  
Open Porosity ◽  
New Technology ◽  
Raw Material ◽  
Surface Porosity ◽  
Separation Of Gases ◽  
Silica Nanopowder

On basis of silica nanopowder «tarkosil» (produced by the authors through new technology of raw material evaporation by electron beam), the nanoporous ceramics with open porosity were used, and its separation properties were studied. For the ceramics, obtained at different sintering temperatures, their specific surface, porosity, and separation factor were determined. The obtained ceramics were applied for separation of four combinations of gases: He/Ar, He/N2, He/CH4, and N2/Ar. The possibility (using the created by the authors ceramics) of helium enrichment his mixtures with more heavy gases was shown

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