The Dependence of Castings Quality Produced in Clay Moulding Mixtures from the Properties of Binder Based on a Montmorillonite

Vasková, Iveta; Fecko, D.; Malik, J.

doi:10.2478/v10266-012-0094-x

Cited by 6 publications

(7 citation statements)

References 1 publication

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“…The wax used was commercial injection wax (Flexible Blue) manufactured by Freeman Manufacturing & Supply (Avon, OH, USA), with a density of 0.945 g/cm 3 . Wax usually used as a matrix for manufacturing models in the lost-wax casting method is characterized by long shelf life, high flexibility, and ability for reproducing very sharp details.…”

Section: Methodsmentioning

confidence: 99%

“…The PE-wax was modified with different bentonite powder content (abbreviated BNT). The used particle-shaped filler in this study was commercially available bentonite, grade bentonite "SN" (Górniczo-Metalowe S.A. "Zębiec", Starchowice, Poland) with a density of 0.816 g/cm 3 . Figure 2a illustrates Scanning Electron Microscope (SEM) pictures of the initial surface morphology of the bentonite made using secondary electron (SE) signals and an image prepared with a back-scattered electron (BSE) detector (TESCAN, Brno, Czech Republic) (Figure 2b).…”

Section: Methodsmentioning

confidence: 99%

“…The production of castings by the method of lost-wax models consists of creating around the model, usually a ceramic mold, and then removing wax by smelting. The next stage is the process of pouring the finished mold with liquid metal and cleaning the resulting casting [1][2][3][4]. In the industry, for the described technology, there is a large variety of model masses, which are mostly waxes [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Polyethylene Wax Modified by Organoclay Bentonite Used in the Lost-Wax Casting Process: Processing−Structure−Property Relationships

et al. 2020

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In this paper, the influence of bentonite (BNT) on rheological properties, linear shrinkage, hardness, and structure of polyethylene wax (PE-wax) used in the lost-wax casting process are studied. Experiments were conducted with PE-wax with different contents of bentonite (from 0.1 to 5 wt.%). The structural changes of modified polyethylene wax were evaluated using differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The addition of bentonite in a concentration range between 0 and 0.8 wt.% into PE-wax caused a decrease of the linear shrinkage and the hardness of PE-wax/BNT blends. Modified polyethylene wax containing greater than 1 wt.% of the filler showed an increase in viscosity. The DSC-based investigations confirmed good miscibility and a uniform structure of PE-wax with BNT. Moreover, an increase in melting temperature onset and its enthalpy observed for filler PE-wax material showed an influence of bentonite on the crystalline structure of the polymeric matrix. SEM observations of the fractured surfaces confirmed the homogeneous structure of blends with contents up to 0.8 wt.% BNT. In the case of higher filler concentrations, the presence of more numerous and large clusters of filler in the polymer matrix was observed due to the increase in the viscosity of the PE-wax/BNT melt composition during mixing. The PE-wax blend with 0.4 wt.% BNT gives better results of reduced linear shrinkage and lower hardness than unmodified material. Lastly, a new developed material (PE-wax/0.4 BNT) was subjected to technological tests, consisting of the preparation of the mold and manufacture of a high-quality aluminum cast, using the lost-wax method.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polyethylene Wax Modified by Organoclay Bentonite Used in the Lost-Wax Casting Process: Processing−Structure−Property Relationships

et al. 2020

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“…When the preheating temperature reaches the expected level the welding process begins. [1][2][3][4][5][6][7][8][9][10] …”

Section: Introductionmentioning

confidence: 99%

Repair Welding of the Massive Cast

Bęczkowski

2017

Archives of Foundry Engineering

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The rebuilding technologies are used to develop surface of ladle. Among many welding methods currently used to obtain surface layer without defects one of the most effective way of rebuilding is using metal arc welding. This additional material gives more possibilities to make expected quality of rebuild surface. Chemical composition, property and economic factors allow to use metal wire. Because of these reasons, solid wire gives opportunity to be wildly used as material to rebuild or repair the surface in different sectors of industry. The paper shows a few ways to rebuild the surface in the massive cast with the use of metal active gas welding for repair. The work presents studies of defect in the massive cast. It contains the pictures of microstructures and defects. The method of removing defects and the results of checking by visual and penetrant testing methods are shown. The paper describes the methodology of repair the ladle with metal active gas welding, preheating process and standards nondestructive testing method.

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“…Light section castings require the use of higher mould pouring temperatures which, in combination with the liquid metal stream thrust force, leads to erosion of the moulding sand and the related occurrence of dirt spots, sand buckles, scabs, etc. Measures preventing presence of non-conformances in thin sections of castings undesirable from the point of view of the customer requirements include, by correct selection of binding materials [4], special mould coatings, controlled compaction of moulding sands, and lowering the pour point [5][6][7][8][9][10]. Improving the mechanical properties is obtained by modifying the liquid alloy [11][12].…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Thin-Wall Casting Mould Cavity Filling Conditions on the Casting Surface Quality

Trytek¹,

Orłowicz²,

Tupaj³

et al. 2016

Archives of Foundry Engineering

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The paper presents results of metallographic examination of faults occurring in the course of founding thin-walled cast-iron castings in furan resin sand molds. A non-conformance of the scab type was Observed on surface of the casting as well as sand buckles and cold shots. Studied the chemical composition by means of a scanning electron microscope in a region of casting defects: microanalysis point and microanalysis surface. Around the observed defects discloses high concentration of oxides of iron, manganese and silicon. A computer simulation of the casting process has been carried out with the objective to establish the cause of occurrence of cold shots on casting surface. The simulation was carried out with the use of NovaFlow & Solid program. We analyzed the flowing metal in the mold cavity. The main reason for the occurrence of casting defects on the surface of the casting was gating system, which caused turbulent flow of metal with a distinctive splash stream of liquid alloy.

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The Dependence of Castings Quality Produced in Clay Moulding Mixtures from the Properties of Binder Based on a Montmorillonite

Cited by 6 publications

References 1 publication

Polyethylene Wax Modified by Organoclay Bentonite Used in the Lost-Wax Casting Process: Processing−Structure−Property Relationships

Polyethylene Wax Modified by Organoclay Bentonite Used in the Lost-Wax Casting Process: Processing−Structure−Property Relationships

Repair Welding of the Massive Cast

The Effect of a Thin-Wall Casting Mould Cavity Filling Conditions on the Casting Surface Quality

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