Author name:
هيثم صباح حميد
Supervisor name:
هادي مشهدي عجيل | احمد هاشم عبد الكريم
Abstract:
The study deals with one of the modern techniques used in the formation of the metal casting, which include using of local materials in the preparation of typical mixtures without needing for imported ready - made mixtures, which are monopoly of technical secrets to those companies. The first chapter discusses the research problem, which were represented in (to reach a mechanism for the use of ceramic shell technology with standard specifications helps for not to loosing a lot of sculptural details and delicate task during the casting process through the traditional techniques). The importance and objectives of the research are : (1. Obtaining of precise details for works of art that perform the ceramic shell technology, 2. Reach for a scientific data base for technical functioning of these mechanisms and capabilities of local materials) as well as the limits of the search. The second chapter (theoretical framework) includes the first section : a brief history for the using of metals, the second section deals with the metals used in the research (as brunze and aluminum) as well as their types and properties the third section deals with the History of the mechanisms of metal casting in ancient civilizations, which are Mesopotamia, the Nile Valley, the Levant, the Greeks, the Romans, the Islamic civilization and then the Renaissance, after this, asection deals with the metal casting techniques, which divided into two types according to the type of templates : permanent, which include centrifugal plumbing and plumbing by electrical clicking and sedimentation. while non - permanent include the plumbing by sand and lost wax which includes two methods, the first one is the normal thermal template (traditional) and the second method of ceramic shell which is the subject of our research. It was taking four previous studies,two of them were Iraqi and two foreign studies. At the end of this chapter we reach to a theoretical framework indicators. The third chapter deals with the research measures which included the identification of research methodology, the research community, samples. And then the selection of local materials that will be included in research trials which are zircon and silica silicate (sand Erdma), Kaolan (Duekhlh), Filnt Klay, sodium silicate water and Sodium carbonate andresin (c.m.c).After preparation, crushing and screening of the materials according to the granular gradients and chemical analysis to determine their characteristics and components then calcination. Dry materials were calcinied at (600°) to lose its chemical water. After preparation of series of preliminary mixtures in some of them depending on local materials as alternatives to foreign ready mixes and through access to sources, references and the Internet, as well as local experiences. Eight mixtures were succeeded through the stuccoing process of the waxy model ,during the process of drying and burning there is problems such as crucking in the surface of ceramic shell as a result of internal tension and external pressure, as well as the reduction in the hardness of ceramic schell after burning due to the weakness in the linking between the components of materials during high temperature causing their destruction after burning, so that it is necessary to raising calcination temperature to 1000 ? to ensure the disposal of the transformations that will get during the burning process. In addition to the getting rid of plasticity to ensure that no shrinking in the ceramic shell after burning. All failed mixtures were excluded,while the other four mixtures were remained which were : Mixture of silicate zircon, silica (crushed Erdma sand), clay Filnt,caolin with silica (Ardma sand), because of the high coast silicate zircon and not providing in large quantities, as well as to the difficulty of obtaining of Filnt clay despite its presence in abundance in Iraq, it has not been extracted and provided in abundance as a consumer material, as there have been some problems in the use alone, so the researcher find two mixtures from (zircon silicate with silica) and ( Calcinied caolin with calcinied silica).The four mixtures considered the sample of research which include (zircon silicate), (silica), (zircon silicate and silica) and (silica and caolin).Which has been conducting laboratory tests on them. The fourth chapter contained the results of the chemical analysis and the results of physical and mechanical tests and their discussion. Also included the conclusions which reached by the researcher. The results showed the success of the four mixtures in the casting of bronze and aluminum models with maintaining the accuracy of the details and achieve the goals of the research. The mixture (A) preferably used in the casting of mineral sculpture with temperature top of the (1200 ?) due to the cost of silicate zirconium, while the mixture (C) is the better becauseof its potential in metal casting and low coast ratio compared with mixture (A). The mixtures (B, D) preferably used in the casting sculpture as alolminium and lower heat metals. Then the recommendations and suggestions as well as a list of Arabic, english references and web sites for information
