105-119, 2004.ĪSTM, Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates, ASTM C136/C136M – 14, 2014. Carter, “❽oes investment permeability impact jewelry castings?,” in Santa Fe Symposium, Albuquerque, EE.UU., pp. Metal., UIS, Bucaramanga, Colombia, 2016. Londoño, Diseño de un procedimiento de fabricación del revestimiento refractario para adaptar el método de gemas pre-engastadas a las esmeraldas colombianas, M.Sc. Kato, “Effect of firing temperature on bending strength of porcelains for tableware,” Jou. Yeh, “Sintering effects on the development of mechanical properties of fired clay ceramics,” Mat. Chevalierb, “Elaboration and characterization of a refractory based on Algerian kaolin,” Cera. Giard, “Fluid Composition, δD of Channel H2O, and δ18O of Lattice Oxygen in Beryls: Genetic Implications for Brazilian, Colombian, and Afghanistani Emerald Deposits,” Inter. Rossman, “The high temperature behavior of water and carbon dioxide in cordierite and bervl,” Amer. Gardner, “Single-crystal vibrational spectra of beryl and dioptase,” J. Zwaan, “Gemmology, geology and origin of the Sandawana emerald deposits, Zimbabwe,” Scr. Rossman, “Joaquinite: The Nature of its Water Content and the Question of Four-Coordinated Ferrous Iron,” Amer. Zecchini, “Infrared spectroscopy and crystal chemistry of the beryl group,” The Can. Gavrilenko, Condiciones de formación y caracterización comparativa con las esmeraldas de otros orígenes, Ph.D. Metal., UIS, Bucaramanga, Colombia, 2015.Į. Daza, Estudio de las variables determinantes en la tolerancia de las esmeraldas colombianas al método de gemas pre-engastadas para el proceso de microfundición, M.Sc. Shuster, “Stone-In-Place Casting for High-End Jewelry,” in Santa Fe Symposium, Albuquerque, EE.UU., pp. Mckeer, “Stone-in-place casting: the investment perspective”, in Santa Fe Symposium, Albuquerque, EE.UU., pp. Schuster, “Problems, causes and their solutions on stone-in-place casting process: latest developments”, in Santa Fe Symposium, Albuquerque, EE.UU., pp. Furthermore, it is possible to subject the emeralds to the stone-in-place micro-casting process that employs the refractory mold developed here, with a thermal treatment that does not surpass the 350 ☌, along with a low melting point (398 ☌) for the precious metal alloy. The results showed that the refractory mold with composition chamotte/plaster 75/25, an addition of 50 % of water to the dried mixture, and fine granulometry (-200 mesh) had a stabilization temperature of 350 ☌. To achieve this, the experimental methodology was divided into three phases: i) raw chemical materials, mineralogical, granulometric and thermal characterization ii) preparation and characterization of chamotte-plaster-water mixtures, including the measurement of casting times, mechanical and microstructural properties, permeability, and resistance to thermal shock and iii) evaluation of the resulting refractory mold in the micro-casting of pre-set emeralds. In the face of this fact, the main purpose of the present work is to develop a refractory mold based on chamotte and plaster, which can be stabilized at low temperatures, in order to use it for the micro-casting of pre-set emeralds. Therefore, this type of micro-casting technique is not suitable for gems such as emeralds, since they are highly susceptible to damage at temperatures over 350 ☌. We also use this vacuum to de-air the investment mixture before pouring it over the wax models to reduce boiling over when vacuuming.Universidad Industrial de Santander (Bucaramanga-Santander, Colombia).Ĭhamotte, Emeralds Micro-Casting, Plaster, Refractory Mold, Stone-In-Place Abstractĭuring the jewelry stone-in-place micro-casting process, the ceramic mold, which is composed of silica and plaster is stabilized at temperatures close to 650 ☌, whereas the casting temperature of the precious metal alloy hovers around 1000 ☌. Jewelry flasks are placed in a vacuum chamber while this mixture is still fluid, where they are boiled at room temperature to remove air bubbles clinging to the models. The dry ingredients are mixed with water and poured into a container or "flask" surrounding the sprued up model, which is either waxed down to a board or attached to a commercially available rubber device which holds the pattern and flask. The investment mold material is made using gypsum plaster (plaster of Paris) as a binder for sand, silica flour, or another refractory aggregate. We use this method for the Sterling silver we cast while we depend upon spin casting for our pewter line. The method of Lost Wax casting we use at The Rams Horn is called "investment" casting. Working from photographs and sketches they create the initial model in green jeweler's wax. To begin the process of creating a new piece James or Beth work out a new design first on the drawing board.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |