Mold filling and porosity in castings of titanium

Herø, H.; Syverud, Morten; Waarli, M.

doi:10.1016/0109-5641(93)90098-b

Cited by 74 publications

(39 citation statements)

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“…The reduction may be related to the solubility of different oxides and this process may be higher in ceramics designed for utilization with cpTi because of the presence of alkaline metallic oxides [35] that was also evident from the failure analysis of this study. Previous studies investigating the adhesion between metal and laboratory resin or metal and ceramics disclosed reduced adhesion after thermal cycling [3,12,25,28,37]. The study of Tróia Jr. et al [28] investigated the same thermal variation and metallic substrate (cpTi) but did not find any influence of thermal cycling on adhesion of ceramic onto this metal.…”

Section: Discussionmentioning

confidence: 92%

“…Several authors considered the shear test as the most adequate method to measure bond between the metal and ceramics [2,8,11,26,31,32]. However other authors [10,12,17,20,33,34] suggest the threepoint-flexure test, four-point-flexure test [28] or biaxial flexure test [1]. The shear test used was highly reliable, because it is based on minimal experimental variables and creates less residual stress at metal-ceramic interface, where the oblique forces are also minimized.…”

Section: Discussionmentioning

confidence: 99%

“…These ceramic systems, so called ultralow-fusing ceramics, have firing temperatures under 800ºC, adequate for preventing the formation of relatively thick layers of titanium oxide, thus enhancing metal-ceramic adherence which is the primary prerequisite for clinical success [9,12,29].…”

Section: Discussionmentioning

confidence: 99%

“…These ceramics, so called low-fusing ceramics, melt at temperatures lower than 800ºC, and have thermal expansion coefficient closer to that of the titanium, thus reducing the stresses at the interface and allowing satisfactory bonding of the two elements [11]. With the advancements in dental technology, the α-case layer can also be controlled almost completely through improved casting techniques by induction in an environment with inert atmosphere of argon or helium gas and with the use of refractory investments that contain oxides such as magnesium, yttrium and zirconium [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of interface characterization and adhesion of glass ceramics to commercially pure titanium and gold alloy after thermal- and mechanical-loading

Vásquez¹,

Özcan²,

Kimpara³

2009

Dental Materials

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of interface characterization and adhesion of glass ceramics to commercially pure titanium and gold alloy after thermal- and mechanical-loading

Vásquez¹,

Özcan²,

Kimpara³

2009

Dental Materials

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“…Density measurement is one of the methods to determine the porosity [10]. The porosity, one of the most frequent defect occurring in metal casting, is still of a serious problem recently.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Shrinkage Porosity in Femoral Stem of Titanium Investment Casting

Sutiyoko

Mahardika

Syamsudin³

et al. 2016

Archives of Foundry Engineering

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Design of gating system is an important factor in obtaining defect-free casting. One of the casting defects is a porosity caused by internal shrinkage in solidification process. Prediction of the internal shrinkage porosity in the femoral stem of commercially pure titanium (CP-Ti) is investigated based on the gating system design. The objective of this research is to get the best gating system between three gating system designs. Three gating system designs of the femoral stem were simulated in an investment casting method. The internal shrinkage porosity occurs on the largest part and near the ingate of the femoral stem. The gating system design that has ingates cross section area: 78.5; 157; and 128.5 mm 2 has the least of the internal shrinkage porosity. This design has the most uniform solidification in the entire of the femoral stem. An experiment is conducted to validate the simulation data. The results of internal shrinkage porosity in the three gating system designs in the simulation were compared with the experiment. Based on the comparison, the trend of internal shrinkage porosity at the three gating system designs in the simulation agrees with the experiment. The results of this study will aid in the elimination of casting defect.

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Dental Prostheses Produced by Integration of Laser Digitizing, Numerical Simulation, Rapid Prototyping into Investment Casting Process

Wagner

Sahm

et al. 2000

Materials for Medical Engineering

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The integration of laser measuring, numerical simulation and rapid-prototyping (RP) into investment casting process proposes a new way for making dental prostheses.Natural tooth crowns were precisely digitized by means of laser measuring technique. The digitized geometry was converted to a standard CAD model. This model was then used to simulate the mold filling, the solidification and the porosity formation etc., hence to improve and ensure the casting quality. The sprue system design was numerically optimized.Real crowns were 'printed' directly out on a RP system from the CAD data. The RP crowns were assembled to the optimized sprue system. Following the investment casting process, titanium crowns with excellent functional contour of the occlusal surface were successfully made on a centrifugal casting machine. For each crown, over 20 replicas were made. All of them were examined by radiograph and no porosity was detected.It is indicated that the traditional waxing procedure in dental laboratory is probably replaced by an integrated RP technique. The quality of the prostheses can be optimized numerically.

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Mold filling and porosity in castings of titanium

Cited by 74 publications

References 1 publication

Evaluation of interface characterization and adhesion of glass ceramics to commercially pure titanium and gold alloy after thermal- and mechanical-loading

Evaluation of interface characterization and adhesion of glass ceramics to commercially pure titanium and gold alloy after thermal- and mechanical-loading

Prediction of Shrinkage Porosity in Femoral Stem of Titanium Investment Casting

Dental Prostheses Produced by Integration of Laser Digitizing, Numerical Simulation, Rapid Prototyping into Investment Casting Process

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