JPH0734808B2 - Method for producing castings from non-precious metal alloys and materials therefor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cast product from a non-precious metal alloy and a material therefor.

[0002]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a dental cast skeleton as described in German Patent No. 3821 204 A1, in which wax and / or wax is placed on a secondary model of a refractory cast bed. Or, a model of a dental cast skeleton made of synthetic resin can be crushed with a particle refining agent (Ko
rnfeinungsmittel) and is at least partially coated with a non-coating inoculant mixture (Impfmittelmischung). After removing the wax and / or the synthetic resin, the inoculant layer remains on the surface of the mold. During the hardening of the non-precious metal alloy melt forming the dental cast framework, the particle-thinning agent contained in the inoculant layer penetrates into the melt, where it stimulates an increase in fine-grain formation. This leads to hardening of the cast framework material in this range. The dental cast framework produced by this method exhibits fine crystalline regions and exhibits good mechanical properties as produced without the inoculum.

The inoculant mixture used in this method is preferably a liquid suspension and, in addition to the particle-refining agent, contains flammable organic and inorganic components as binders.
Apart from the formation of cracks in the model during the drying of the inoculant mixture, the inoculant coating risks bending the model and deviating the casting path accuracy.

[0004]

The object of the invention is therefore to be able to lead to castings with a fine grain structure without impeding the passage accuracy of the casting, and for the injection and hardening of the inoculant mixture. It is to find a unique technique that can avoid such additional steps. Further provided is a material for use in the method.

[0005]

According to the invention, the method according to the invention for solving these problems is that the model is made of a wax and / or a synthetic resin containing a particle-thinning agent in which it is evenly distributed. It is characterized by that. That is, the present invention creates a model made of wax and / or synthetic resin,
By embedding the model in a refractory cast floor, removing the wax and / or synthetic resin to form a mold, and injecting a molten non-precious metal alloy therein, using a particle refining agent, A method for producing a dental casting from a non-precious metal alloy, characterized in that the model is made from wax and / or synthetic resin containing a uniformly distributed particle-thinning agent.

According to the present invention, the particle sizing agent is contained in the wax and / or the synthetic resin in an amount of 0.5 to 20% by weight, preferably 3 to 10% by weight, and the particle size is 100 μm or less, preferably It has been found that a range of 2 to 50 μm is suitable. In the process according to the invention, in principle, all suitable particle-reducing agents in the process of DE 38 21 204 A1 can be added. However, cobalt-titanium-silicates, cobalt-zirconium-silicates, titanium dioxide and zirconium dioxide, especially the first-mentioned one, are preferred, each before casting the dental alloy on a cobalt-chromium-molybdenum substrate. Particle sizing agents of, as well as other
It can be used by mixing with seeds and several species.

After removing the wax and / or the synthetic resin, the particle-thinning agent is present in a loosely adhered form on the surface of the mold space, unlike known methods. The particle refiner is
It is captured during casting of the melt that is cast into the mold, is melted by the melt, and is evenly distributed by the flow of the melt. Therefore, when the melt hardens, a very fine granular and uniform structure is formed. for that reason,
The castings produced by the method according to the invention exhibit very good mechanical properties, such as elongation at break, tensile strength, yield point. The passage accuracy of the casting is also very good.

The material used in this method is, according to the invention, characterized in that it consists of a wax and / or a synthetic resin, in which it contains a uniformly distributed particle-refining agent. . It has been found that the material contains 0.5 to 20% by weight, preferably 3 to 10% by weight, of finely divided particles, the particle size of which is below 100 μm, preferably in the range of 2 to 50 μm.

The material may contain suitable particle-thinning agents in the process of DE 38 21 204 A1. However, it has been found that cobalt-titanium-silicates, cobalt-zirconium-silicates, titanium dioxide and zirconium dioxide, of which the first mentioned is particularly preferred. Each of the particle refiners may be contained in the wax or the synthetic resin alone and in a mixture with one or several other particles. Due to this material, waxes and synthetic resins which are used as model materials in the usual way in dental technology and which burn without residue are
All can be used. The production of this material is carried out by mixing a liquid wax or synthetic resin with a particle-thinning agent. It has been found suitable that the drug is in the form of a plate, wire, grid or hood.

The material according to the invention does not require any additional working material due to the use of particle-thinning agents and is cast in the usual manner in the dental art without any individual process changes or new additions. Made it possible to manufacture. Surprisingly, the German patents used in the composition as well as in the application
38 21 204 Compared to the inoculant mixture of No. A1, casting with a fine granular and uniform structure and high passage accuracy is achieved by the combination of a grain refiner and a working material used in a conventional method, for example, a model material. It is noteworthy that the article can be manufactured in the usual way. The method and material of the present invention is a denture plate (Zahnprothesepl) made of a non-precious metal alloy.
atte), crowns, bridges, inlays and onlays can be manufactured.

[0011]

EXAMPLES To illustrate the invention in more detail, the following examples describe the manufacture of dental denture plates dentally alloyed to a cobalt-chromium-molybdenum substrate according to the invention. Example On a secondary model of a patient's dentition consisting of a refractory cast floor,
Cobalt-Titanium-with a particle size in the range of 2-50 μm
A model of denture plate was manufactured from a plate made of wax containing 3% by weight of silicate uniformly distributed. A casting opening and a casting passage made of a normal wax for a model were attached to this model, and then the model was embedded in a casting floor. After the casting floor was hardened, it was heated to remove the wax. Subsequently, by heating the resulting mold to 1030 ° C., cobalt - chromium - molybdenum - dental alloys: The melt of Heraenium ^R CE (WCHeraeus Inc. registered trademark) was cast into a mold. After cooling, the denture plate was taken out and finished by a known method. The cobalt-chromium-molybdenum-alloy that formed the denture plate had stem crystal (Stenge
It had a very fine granular and uniform structure without lkristall).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Udo Schusser Germany, 8755 Alzenau, Lanestraße 12 (72) Inventor Winfried Kramer Germany, 6482 Bad Orp, Haupstraße 44-46

Claims (13)

[Claims] 1. A model made of wax and / or synthetic resin is prepared, the model is buried in a refractory casting floor, the wax and / or synthetic resin is removed to form a mold, and the molten non-melt In a method for producing a dental casting from a non-precious metal alloy by using a grain refiner by injecting a precious metal alloy, a wax and / or a composition containing the grain refiner in which the model is uniformly distributed. A method characterized by being made from a resin. 2. The method according to claim 1, wherein the particle sizing agent is contained in the wax and / or the synthetic resin in an amount of 0.5 to 20% by weight. 3. The method according to claim 2, wherein the particle size reducing agent is contained in the wax and / or the synthetic resin in an amount of 3 to 10% by weight. 4. The method according to claim 1, wherein the particle size of the particle refiner is 100 μm or less. 5. The method according to claim 4, wherein the particle size of the particle refiner is in the range of 2 to 50 μm. 6. The particle refiner comprises cobalt-titanium-silicate, cobalt-zirconium-silicate, titanium dioxide and / or zirconium dioxide.
5. The method according to any one of 5. 7. A wax and / or a synthetic resin,
A material for use in a method according to any of claims 1 to 6, characterized in that it consists of a particle-thinning agent uniformly distributed therein. 8. A material according to claim 7 which contains 0.5 to 20% by weight of a particle sizer. 9. A material according to claim 8 which contains from 3 to 10% by weight of a particle-thinning agent. 10. The material according to claim 7, wherein the particle size of the particle refiner is 100 μm or less. 11. The material according to claim 10, wherein the particle size of the particle refiner is in the range of 2 to 50 μm. 12. The particle refiner comprises cobalt-titanium-silicate, cobalt-zirconium-silicate, titanium dioxide and / or zirconium dioxide.
The material according to any one of 1 to 11. 13. The material according to claim 7, which is plate-shaped, wire-shaped, lattice-shaped or hood-shaped.