Dentistry. Casting investments and refractory die materials

2006 ◽  
Keyword(s):  
Die Materials

High Temperature Mechanical Properties of Ni-Al-Cr Based Alloys with Refractory Alloying Elements

2006 ◽  
Vol 510-511 ◽  
pp. 358-361
Author(s):  
Won Yong Kim ◽  
Han Sol Kim ◽  
In Dong Yeo ◽  
Mok Soon Kim
Keyword(s):  
High Temperature ◽  
Volume Fraction ◽  
Lattice Parameter ◽  
Alloying Elements ◽  
Solid Solution Hardening ◽  
High Temperature Strength ◽  
High Temperature Mechanical Properties ◽  
Die Materials ◽  
The Matrix ◽  
Effective Role

We report on advanced Ni3Al based high temperature structural alloys with refractory alloying elements such as Zr and Mo to be apllied in the fields of die-casting and high temperature press forming as die materials. The duplex microstructure consisting of L12 structured Ni3Al phase and Ni5Zr intermetallic dispersoids was observed to display the microstructural feature for the present alloys investigated. Depending on alloying elements, the volume fraction of 2nd phase was measured to be different, indicating a difference in solid solubility of alloying elements in the matrix γ’ phase. Lattice parameter of matrix phase increased with increasing content of alloying elements. In the higher temperature region more than 973K, the present alloys appeared to show their higher strength compared to those obtained in conventional superalloys. On the basis of experimental results obtained, it is suggested that refractory alloying elements have an effective role to improve the high temperature strength in terms of enhanced thermal stability and solid solution hardening.

scholarly journals On the Use of Conformal Cooling in High-Pressure Die-Casting and Semisolid Casting

Technologies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 39
Author(s):  
Anders E. W. Jarfors ◽  
Ruslan Sevastopol ◽  
Karamchedu Seshendra ◽  
Qing Zhang ◽  
Jacob Steggo ◽  
...  
Keyword(s):  
High Pressure ◽  
Die Casting ◽  
Life Extension ◽  
Conformal Cooling ◽  
High Pressure Die Casting ◽  
Cooling Channels ◽  
Die Life ◽  
Die Materials ◽  
Pressure Die Casting ◽  
Semisolid Casting

Today, tool life in high pressure die casting (HPDC) is of growing interest. A common agreement is that die life is primarily decided by the thermal load and temperature gradients in the die materials. Conformal cooling with the growth of additive manufacturing has raised interest as a means of extending die life. In the current paper, conformal cooling channels’ performance and effect on the thermal cycle in high-pressure die casting and rheocasting are investigated for conventional HPDC and semisolid processing. It was found that conformal cooling aids die temperature reduction, and the use of die spray may be reduced and support the die-life extension. For the die filling, the increased temperature was possibly counterproductive. Instead, it was found that the main focus for conformal cooling should be focused to manage temperature around the in-let bushing and possibly the runner system. Due to the possible higher inlet pressures for semisolid casting, particular benefits could be seen.

Influences of Sintering Process on the Microstructure and Mechanical Behavior of ZrO2 Nano-Composite Ceramic Tool and Die Material

2010 ◽  
Vol 154-155 ◽  
pp. 1356-1360 ◽  
Author(s):  
Ming Dong Yi ◽  
Chong Hai Xu ◽  
Jing Jie Zhang ◽  
Zhen Yu Jiang
Keyword(s):  
Mechanical Properties ◽  
Ceramic Material ◽  
Composite Ceramic ◽  
Sintering Process ◽  
Ceramic Tool ◽  
Nano Composite ◽  
Pure Zro2 ◽  
Die Materials ◽  
Die Material ◽  
Composite Ceramic Material

A new ZrO2 nano-composite ceramic tool and die material was prepared with vacuum hot pressing technique. The effects of sintering parameters on the nano-composite ceramic tool and die materials were studied. The results indicated that the mechanical properties of ZrO2 nano-composite ceramic tool and die material with the additions of TiB2 and Al2O3 are higher than that of the pure ZrO2 ceramic material. Sintering at 1100 for 120min could improve the density and mechanical properties of ZrO2 nano-composite ceramic material. The flexural strength, fracture toughness and hardness with the optimum sintering parameters can reach 878MPa, 9.54MPa•m1/2 and 13.48GPa, respectively, obviously higher than that with non-optimum sintering parameters.

scholarly journals Die and Die Materials - An Overview

2020 ◽  
Vol 4 (7) ◽  
pp. 06-15
Author(s):  
Sunny Sharma ◽  
Lucky Jindal ◽  
Abhishek Kumar ◽  
Kumar Gaurav ◽  
Rudhra Munshi ◽  
...  
Keyword(s):  
Die Materials

scholarly journals Comparative evaluation of fine detail reproduction of six different die materials- An in-Vitro study

2021 ◽  
Vol 7 (3) ◽  
pp. 166-171
Author(s):  
Pronoy Mukhopadhyay ◽  
Sattyam Wankhade ◽  
Jyoti Wankhade ◽  
Arun Khalikar
Keyword(s):  
In Vitro Study ◽  
Tooth Surface ◽  
Type Iv ◽  
Fine Detail ◽  
Die Materials ◽  
Die Material ◽  
Type V ◽  
Post Hoc ◽  
Conventional Type

The precise outcome of any indirect casting, depends on the various procedures and materials involved through all its stages. The accurate fit against the prepared surface and the adaptation against the prepared margin depends on how accurately the tooth surface is captured in the impression made and how well it is reproduced in the die This study aims to study and compare the property of fine detail reproduction amongst six die materials.Over a pre-calibrated master die using custom tray, an impression record is made and poured using the six different die materials and the finest line reproduced is visualized under an optical fluorescent microscope at 50X magnification.The data obtained were statistically analysed using one-way ANOVA and subsequently assessed by post-hoc Tukey’s comparison to identify any significant differences between the groups. Epoxy resin die material (1.93 mm) showed a consistently excellent fine detail reproduction, followed by conventional Type V gypsum and Synthetic gypsum (15.91 mm), while Resin modified-Type IV and Type V and conventional Type IV gypsum dies (21.86mm) showed the least accuracy in fine reproduction.

Combinatorial Searching for Ni-Nb-Zr Amorphous Alloys as Glass Lens Molding Die Materials

2010 ◽  
Vol 447-448 ◽  
pp. 661-665 ◽  
Author(s):  
Junpei Sakurai ◽  
Mitsuhiro Abe ◽  
Masayuki Ando ◽  
Seiichi Hata
Keyword(s):  
Thermal Stability ◽  
Amorphous Alloys ◽  
Plasma Deposition ◽  
X Ray Diffraction ◽  
High Fracture ◽  
Thermal Stabilities ◽  
Suitable Material ◽  
Die Materials ◽  
Glass Lens ◽  
Lens Molding

This paper presents a search for Ni-Nb-Zr amorphous alloys for application as glass lens molding die materials. To efficiently screen candidate materials, we employed the combinatorial method partially to evaluate thermal stability. First, compositionally spread Ni-Nb-Zr libraries were fabricated by combinatorial arc plasma deposition (CAPD). In order to evaluate the high thermal stability, Ni-Nb-Zr amorphous samples in the libraries were annealed at 723K, the molding temperature for glass lens, for various times in vacuum. Phases in the annealed samples were identified by X-ray diffraction. From XRD identification, candidate amorphous samples with high thermal stabilities were screened. Sputtered samples with the same compositions as the candidate amorphous samples were then fabricated. Other desired properties for glass lens molding die materials, such as mechanical strength, machinability and anti-sticking properties, were evaluated. These investigations revealed Ni36Nb39Zr25 to be a suitable material for a new glass lens molding die. This material exhibited a high fracture stress f of 1.3 GPa, good heat resistance, good machinability, and excellent anti-sticking properties to molten glass.

Influence of Die Material upon Formability and Galling of Hot-Dip Galvanized Steel Sheets

2006 ◽  
Vol 505-507 ◽  
pp. 691-696
Author(s):  
Yu Li Lin ◽  
Hshah Shun Li ◽  
Hou Sheng Hwang
Keyword(s):  
Galvanized Steel ◽  
Diamond Like Carbon ◽  
Steel Sheets ◽  
Coated Materials ◽  
Die Materials ◽  
Die Material ◽  
Better Than

Stretching forming test was utilized to evaluate the influence of die material upon formability and galling of hot-dip galvanized steel sheets. SS41 and SKD11 were used as the substrate of die materials which CrN, TiN and DLC (diamond like carbon) were coated on SS41 and SKD11 substrate. It was found that die with coated materials performs better than that without coated materials in terms of formability and friction. Moreover, DLC coated die material shows the best performance on formability, friction and galling comparing to other coated materials.

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