| Autor: |
T. Snopkiewicz, Jerzy Zych |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Metallurgy and Foundry Engineering. 37:41 |
| ISSN: |
1230-2325 |
| DOI: |
10.7494/mafe.2011.37.1.41 |
| Popis: |
Ceramic moulds applied in the investment casting technology are multilayer structures, built in an alternating process of depositing and drying of successive layers. Each individual layer is formed from a fluid (liquid) ceramic moulding sand and a grain matrix. In the current, environmentally technology fluid ceramic sands based on ethyl silicate are being substituted by ceramic sands containing colloidal silica as a binder. The ability and rates of drying and hardening of these new colloidal (water) ceramic moulding sands are quite different than of the ones which have a binder dissolved in alcohol. The kinetics of the process based on new binders is not well known. The technological principle requires that the successive layer deposition is done only when the one deposited previously is already sufficiently dry. Investigations of the possibility of application of some methods including: ultrasound, resistance and weigh method are presented in the paper. Advantages and disadvantages of each method are indicated as well as the assessment of their practical suitability is perfomed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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