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Casting Machine (casting + machine)
Selected AbstractsCarbon Long Fiber Reinforced Aluminum Matrix Composites , Parameter Studies and Numerical Simulations of the Infiltration Process,ADVANCED ENGINEERING MATERIALS, Issue 7 2010Heiko Ballmes Within this work, the development of a cost efficient and reliable production technique for infiltrating carbon fibers with aluminum using a conventional cold chamber die casting machine is reported. Results are presented that demonstrate the large potential of pressure die casting as a low cost manufacturing process for carbon fiber reinforced aluminum matrix composites. The influence of process parameters on the infiltration behaviour is investigated and compared to results gained by numerical simulation. [source] Cast titanium overlay denture for a geriatric patient with a reduced vertical dimensionGERODONTOLOGY, Issue 4 2005Satyabodh Guttal An older patient reporting to the dental surgery for his/her dental treatment is becoming a common occurrence. Improved oral hygiene has meant that teeth are retained for a longer time, along with the potential problems of attrition, decreased vertical dimension, temporomandibular joint discomfort/strain, and poor aesthetics. The case in question is that of a 65-year-old male patient who had severe attrition in the lower arch, temporomandibular joint pain and reduced vertical dimension. The maxillary arch had previously been restored with a fixed partial prosthesis. For restoration of the lower teeth, a removable cast titanium overlay denture was fabricated incorporating an increased vertical dimension. Porcelain facings were placed to restore the aesthetics of the anterior teeth. The titanium was cast in a semi-automatic electric arc, pressure type casting machine. A titanium overlay denture with porcelain facing on the anterior teeth may provide a means of restoring a patient's concerns regarding aesthetics and function. [source] Adhesive bonding of super-elastic titanium,nickel alloy castings with a phosphate metal conditioner and an acrylic adhesiveJOURNAL OF ORAL REHABILITATION, Issue 6 2003H. Matsumura summary, The purpose of the current study was to evaluate the bonding characteristics of super-elastic titanium,nickel (Ti,Ni) alloy castings. Disk specimens were cast from a Ti,Ni alloy (Ti-50·85Ni mol%) using an arc centrifugal casting machine. High-purity titanium and nickel specimens were also prepared as experimental references. The specimens were air-abraded with alumina, and bonded with an adhesive resin (Super-Bond C & B). A metal conditioner containing a phosphate monomer (Cesead II Opaque Primer) was also used for priming the specimens. Post-thermocycling average bond strengths (MPa) of the primed groups were 41·5 for Ti,Ni, 30·4 for Ti and 19·5 for Ni, whereas those of the unprimed groups were 21·6 for Ti, 19·3 for Ti,Ni and 9·3 for Ni. Application of the phosphate conditioner elevated the bond strengths of all alloy/metals (P < 0·05). X-ray fluorescence analysis revealed that nickel was attached to the debonded resin surface of the resin-to-nickel bonded specimen, indicating that corrosion of high-purity nickel occurred at the resin,nickel interface. Durable bonding to super-elastic Ti,Ni alloy castings can be achieved with a combination of a phosphate metal conditioner and a tri- n -butylborane-initiated adhesive resin. [source] Differing Expansion Contributions of Three Investment Materials Used for Casting TitaniumJOURNAL OF PROSTHODONTICS, Issue 5 2009Danny Low BDS, MScDent, MScMed Abstract Purpose: This laboratory study aimed at investigating the effect of setting expansion (SE), which could enlarge a wax pattern by concurrent exothermic reaction. Materials and Methods: Two phosphate-bonded investment materials (Rematitan Plus, T-invest C & B) and alumina-magnesia-based investment material (Titavest CB) were subjected to setting temperature and SE measurements (n = 10). Full-crown wax patterns were prepared from metal dies having the same design. Crown castings (n = 6) were made using a one-chamber high-pressure casting machine. Commercially pure titanium ingot (Japanese Industrial Standard Class II) was used for each casting. Dimensional accuracy of the cast crowns was expressed by marginal discrepancy for a pair of wax pattern and casting prepared from the same die. All results were then subjected to regression analysis. Results: Rematitan Plus gave the highest setting temperature (about 70°C) and the highest SE (1.16 ± 0.01%) almost concurrently. The result was that Rematitan Plus produced oversized crowns from the lowest thermal expansion (TE) value (0.53 ± 0.05%) reducing the linear correlation to 0.80 (p < 0.05). No significant linear relationship was found between SE of investment material and crown-casting accuracy. Conclusions: The almost concurrent occurrence of high SE and high setting temperature generation in Rematitan Plus enlarged the wax pattern and effectively supplemented its low TE to produce oversized crowns. Despite this adverse effect, the correlation between TE and crown accuracy was still high. It is generally expected that the TE values given by manufacturers predict crown accuracy, when uniform TE, small SE, and minimum heat generation during setting are assured. [source] | ||||||||||