Acceleration of the Formation on the Sodium Silicate Binder in Investment Casting

2019 ◽  
Vol 946 ◽  
pp. 673-677 ◽  
Author(s):  
L.G. Znamenskii ◽  
O.V. Ivochkina ◽  
A.S. Varlamov
Keyword(s):  
Sodium Silicate ◽  
Investment Casting ◽  
Cost Reduction ◽  
Processing Time ◽  
Environmental Load ◽  
Spalling Resistance ◽  
Production Time ◽  
Softening Effect ◽  
Silicate Binder ◽  
Heat Resistant

For cost reduction of the molds manufacturing, as well as environmental load in foundries sodium silicate binder is often used. However, without treatment with special compositions that accelerate curing and improve their properties, sodium silicate molds have insufficient thermal spalling resistance and often cause the rejection of castings made of heat-resistant alloys. As a result of the research, there was developed a technology of chemical drying of the sodium silicate cover layers in investment casting with the use of aluminoborbophosphate concentrate. It allows to reduce the production time of ceramic molds by 2...3 times, as well as to increase their strength either before baking or after it by 20...25 %. At the same time, as a result of softening effect of aluminoborbophosphate concentrate after baking and cooling of the specimens there has been observed a significant reduction of their retained strength and, as a consequence, better knockout of fire-resistant shells. Industrial tests of the sodium silicate cover chemical drying showed a significant reduction of the investment castings rejection due to the insufficient thermal spalling resistance and the reduction of the cleaning processing time of casting made of heat-resistant alloys.

scholarly journals The Effect of Nanostructure Modification on the Silicate Binder on Its Binding Characteristics and Functional Properties

2014 ◽  
Vol 59 (3) ◽  
pp. 1033-1036 ◽  
Author(s):  
I. Izdebska-Szanda ◽  
A. Baliński ◽  
M. Angrecki ◽  
A. Palma
Keyword(s):  
Chemical Modification ◽  
Sodium Silicate ◽  
Functional Properties ◽  
Elevated Temperatures ◽  
Technological Properties ◽  
Ferrous Alloys ◽  
Silicate Binder ◽  
Binding Characteristics ◽  
The Impact

Abstract A method for the chemical modification of silicate binder (hydrated sodium silicate) affecting the distribution of its nanostructure elements was disclosed. The effect of silicate binder modification on the resulting technological properties of moulding sands, determined under standard conditions and at elevated temperatures in the range from 1000C to 9000C, was discussed. Modification of this type is done on inorganic binders in order to reduce their unfavourable functional properties. It is particularly important when moulding sands with the silicate binder are used for casting of low-melting alloys. Therefore special attention was paid to the impact that modification of inorganic binders may have on the knocking out properties of sands prepared with these binders, when they are used in the process of casting non-ferrous alloys.

Heat-resistant concretes based on sodium-silicate compositions and aluminate slurry additions

Refractories ◽  
1991 ◽  
Vol 32 (9-10) ◽  
pp. 530-532
Author(s):  
A. I. Khlystov ◽  
S. F. Koren'kova ◽  
T. V. Sheina
Keyword(s):  
Sodium Silicate ◽  
Heat Resistant

Preparation and properties of isotropic Nd-Fe-B bonded magnets with sodium silicate binder

2017 ◽  
Vol 435 ◽  
pp. 187-193 ◽  
Author(s):  
W.Q. Liu ◽  
R.J. Hu ◽  
M. Yue ◽  
Y.X. Yin ◽  
D.T. Zhang
Keyword(s):  
Sodium Silicate ◽  
Silicate Binder

scholarly journals Corundum Molds for Investment Casting from Refractory Alloys and Metals

2010 ◽  
Vol 2010 ◽  
pp. 1-5
Author(s):  
P. A. Storozhenko ◽  
G. I. Shcherbakova ◽  
D. V. Sidorov ◽  
M. S. Varfolomeev ◽  
A. S. Murkina
Keyword(s):  
Surface Roughness ◽  
Investment Casting ◽  
High Heat ◽  
Metals And Alloys ◽  
Performance Properties ◽  
Refractory Alloys ◽  
Heat Resistant ◽  
Physical Chemical ◽  
And Performance ◽  
Reactive Metals

Production procedure, physical-chemical, and performance properties of ALUMOX silica-free binder used for the production of high-heat-resistant corundum shell molds by consumable patterns employed in the production of critical molds from superalloyed reactive metals and alloys are described. ALUMOX usage allows obtaining casts from reactive metals and alloys with surface roughness up to  m (basic casts— m), which, in its turn, increases fatigue parameters of the material (endurance, durability).

Collapsibility Studies of MJM Acrylate Patterns for Investment Casting

2013 ◽  
Vol 330 ◽  
pp. 839-842
Author(s):  
O.M.F. Marwah ◽  
S. Sharif ◽  
M. Ibrahim ◽  
M.H. Idris
Keyword(s):  
Investment Casting ◽  
Cost Reduction ◽  
Lead Time ◽  
Casting Process ◽  
Ash Content ◽  
Ceramic Mold ◽  
Significant Cost ◽  
Volume Production ◽  
Materials Used ◽  
Significant Cost Reduction

Direct rapid investment casting (IC) is among the favorable and economical casting process due to its flexibility in fabricating any geometrical part features within a shorter lead time. Polymer based materials used in rapid prototyping (RP) technologies are exhibiting significant cost reduction for low volume production and are potentially replacing conventional wax materials as sacrificial patterns in IC process. This paper reports on the collapsibility characteristics of acrylate patterns during the burnout process for IC molds. The acrylate based patterns were fabricated by a Multijet Modelling (MJM) process with hollow internal structure. The MJM patterns were then Slurry procedure were introduced for producing toughest ceramic mould to prevent cracking occurrence. Results showed that the acrylate patterns start to decomposed gradually from the ceramic mold at 350°C and at 600°C, a total clean burnout without any residues and ash content was attained. This study shows that acrylate patterns built from RP technologies are suitable for fabricating ceramic molds and are highly potential in substituting conventional wax for IC process.

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