scholarly journals Modification of inorganic binder used for sand core-making in foundry practice

China Foundry ◽  
2020 ◽  
Vol 17 (5) ◽  
pp. 341-346
Author(s):  
Fang-hai Xin ◽  
Wei-hua Liu ◽  
Lai Song ◽  
Ying-min Li
Keyword(s):  
China Foundry ◽  
2019 ◽  
Vol 16 (4) ◽  
pp. 267-271 ◽  
Author(s):  
Lai Song ◽  
Wei-hua Liu ◽  
Ying-min Li ◽  
Fang-hai Xin
Keyword(s):  

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Lyuben Leschtakov ◽  
Thomas Zimmermann

Abstract The following article presents the first mould ever discovered for casting a so-called “Syrian Bottle”, a distinctive vessel type that originated in Mesopotamia around the mid 3rd millennium BC and soon after spread to Anatolia, the Aegean and Southeast Europe, as imports and local derivatives. A few examples were made from precious metals and lead, the most notable one being a golden globular bottle, part of “Priam’s” Treasure A” from Early Bronze Age Troy. The mould from Lipnik seems to have been intended for the production of small metal bottles of ‘Syrian’ shape, and supportive agents like a green sand core applied for the production of such a complex item. The mould, however, was obviously never used. A review of associated manufacturing details like pegholes, riser and vent show that although these features were particularly prominent in the 2nd millennium BC, moulds from earlier (Anatolian) contexts do possess such characteristics as well. This currently unique, locally produced example is therefore dated to the latest 3rd or earliest second millennium BC, coinciding with ever-growing interaction between distant cultural entities stretching from Mesopotamia to Southeast Europe and beyond, and allowing for the exchange of ideas, fashions and technologies.


2008 ◽  
Vol 396-398 ◽  
pp. 433-436
Author(s):  
Takeshi Yabutsuka ◽  
Yuzo Inoue ◽  
Masayuki Shimada ◽  
Mitsuhiro Hibino ◽  
Takeshi Yao

Apatite nuclei were dispersed in inorganic binder and the apatite nuclei-contained inorganic binder was coated on polyethyleneterephthalate plate. Hydroxyapatite was induced by the apatite nuclei dispersed in the binder and hydroxyapatite layer was formed on the surface of the substrate by soaking in SBF. The hydroxyapatite layer showed high adhesive strength to the substrate.


2011 ◽  
Vol 1 (32) ◽  
pp. 8 ◽  
Author(s):  
Gosse Jan Steendam ◽  
Jentsje W. Van der Meer ◽  
Bianca Hardeman ◽  
André Van Hoven

In 2009 tests have been performed at the Afsluitdijk, the closure dike of Lake IJssel in the Netherlands. This dike has a sand core covered by layers of clay and boulder clay, and a grass cover. In 2010 succeeding tests were performed at a river dike near Zwolle. This dike was a sand dike with a grass cover. In all of these tests research was performed on the behaviour of the grass cover on the landward slope of the dikes. Furthermore, the influence on erodibility of the grass cover caused by damage of the grass cover by mice, moles or other influences like tractor tracks were investigated. Also the influence of obstacles or other elements, which may be present at dikes, was part of the investigations (tree, stairs, fence, maintenance road). It was observed that all of these influences are to some extent contributing to a decrease of the resistance against failure.


Volume 3 ◽  
2004 ◽  
Author(s):  
Sayavur Bakhtiyarov ◽  
Ruel A. Overfelt ◽  
Amit Suryawanshi ◽  
Johnathon Capps

This paper presents the results of experimental and numerical studies of hot distortion phenomenon in the phenolic urethane cold box systems. Dual Pushrod Dilatometer has been used to measure a thermal expansion/contraction of phenolic urethane cold box sand core specimens at temperature range from 25° C to 800° C. The high temperature tensile tests showed that the tensile strength of the phenolic urethane cold box silica sand cores is significantly affected by the bench life, temperature and binders level. High temperature hot distortion furnace tests on cylindrical cores showed that some aluminum coatings increase the temperature limit when distortion starts, but can’t prevent it. The hot distortion test aluminum castings showed that regardless of the application of coating, the type of coating, and anti-veining additives, all cores (silica sand) with density less than the density of the molten metal (aluminum alloy) were significantly distorted. Numerical simulations of the liquid metal flow around the cylindrical sand core and analysis of dynamic forces acting on the core during fill process showed that a buoyancy force is the major contributor to the hot distortion. It is concluded that the one of the solutions in preventing the hot distortion of sand cores is increasing their weigh, which will balance the buoyancy force and will bring the resultant force to the minimum. The hot distortion test castings using zircon sand cores (both coated and non-coated) with density almost equal to the density of the molten aluminum proved our predictions, and hot distortion has been prevented.


2018 ◽  
Vol 2018 (13) ◽  
pp. 1195-1198 ◽  
Author(s):  
M. A. Gorodetskii ◽  
V. A. Nelyub ◽  
G. V. Malysheva ◽  
A. Yu. Shaulov ◽  
A. A. Berlin

2005 ◽  
Vol 297-300 ◽  
pp. 2459-2464
Author(s):  
Won Jo Park ◽  
Chu Yong Kim ◽  
Sun Chul Huh ◽  
Kwang Young Lee

An aluminum borate whisker (Al18B4O33w) was recognized as an attractive reinforcement for the aluminum alloy, It is good strength, high wear resistance, good thermal stability and low cost, comparable with those of other whiskers such as SiC and Al2O3. In general, aluminum borate whisker reinforced AC4CH alloy composites have been produced by squeeze casting process, which is capable of promoting the higher specific mechanical properties. α+Al18B4O33w/AC4CH (α: SiO2, Al2O3, TiO2sol) composites were fabricated by squeezecasting method in which the molten aluminum infiltrated into the whisker preform. The primary objective of this study was to establish the influence of the fracture toughness of α+Al18B4O33w reinforced composite by different containing inorganic binder. In addition, the fracture mechanism was evaluated through the scanning electron micrographs. As results, fracture toughness the composite containing TiO2 sol was shows plane about 9.28Mpa-m0.5. TiO2 inorganic binder can enhance fracture toughness of the Al18B4O33w reinforced composite. In order to obtain Al18B4O33w reinforced aluminum composites to have good fracture toughness use of TiO2 inorganic binder is recommend.


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