KR101476145B1 - Ni-Cr-Co base alloys showing an excellent combination of bonding to porcelain and mechanical properties used as a porcelain-fused-to-metal - Google Patents

Abstract

The alloy for a nickel-chromium-cobalt-based ceramics prefectural material according to the present invention, which is excellent in bonding properties between ceramics metals and mechanical characteristics, can be produced by using nickel (Ni) and chromium (Cr) as a main component and not having beryllium (B) and iron (Fe) are added to improve the elongation, and an appropriate amount of molybdenum (Mo), silicon (Si), aluminum (Al), niobium (NB), tantalum ), Niobium (NB), tantalum (Ta), etc., in an appropriate amount, and adding an appropriate amount of cobalt (Co) to obtain excellent bonding strength between porcelain and metal.
According to the present invention, not only harmless to the human body but satisfying the yield strength and elongation ratio, it is advantageous that the porosity in the workshop and the casting in the molding process are greatly improved and the bonding strength with the porcelain is improved, It is possible to use the teeth for a longer period of time with good aesthetics and has excellent castability and elongation so that the tooth movement is small and the fatigue breaking resistance is high when the tooth is attached to the tooth, .

Description

TECHNICAL FIELD The present invention relates to a nickel-chromium-cobalt-based ceramics alloy having excellent bonding properties and mechanical properties between ceramics metals, and an excellent combination of porosity and mechanical properties as a porcelain-fused-to-

More particularly, the present invention relates to an alloy for a dental porcelain bovine part, which is free from beryllium (Be) and is harmless to the human body, satisfies the yield strength and elongation ratio and is excellent in pouring and molding. To a nickel-chromium-cobalt-based ceramics precious metal alloy excellent in mechanical properties and inter-ceramic interfacial bonding properties, which allows the teeth to be used for a longer period of time with little tooth movement and high resistance to fatigue fracture.

Generally, metals have excellent mechanical properties such as tensile strength and compressive strength, but they have the disadvantage that they can not obtain the natural tooth color due to the unique color of the metal, and they also cause corrosion. Therefore, in order to overcome these disadvantages, we use dental prosthesis alloy which combines excellent mechanical properties and precision of porcelain and metal with excellent aesthetics. Such an alloy is called an alloy for ceramic porcelain.

Because dental alloys are used in the oral cavity where various environmental changes such as temperature, acidity, and pressure change occur, they should first be able to withstand the mating pressure, be free of wear and deformation, be comparable to the hardness and strength of teeth , Should be similar to tooth color. In addition, there should be no corrosion or discoloration in the mouth and no harmfulness to human body. From this point of view, non-precious metal prosthetic alloys for dental porcelain soap satisfying all conditions are nickel (Ni) - chromium (Cr) based ceramics.

However, almost all nickel-chromium (Cr) based alloys which are currently sold globally contain beryllium (Be), which is likely to cause various diseases due to toxicity. The reason for adding beryllium (Be) to the nickel (Ni) - chromium (Cr) based alloy is that harmful to the human body, beryllium (Be) is added not only to lower the melting point of the alloy and improve the casting composition, This is because the thickness of the oxide layer is thin, thereby enhancing the bonding strength with the porcelain as well as excellent esthetics. As the toxicity of beryllium (Be) became known, its use was restricted and a commercial alloy containing no beryllium (Be) was developed. However, bonding strength with porcelain is lower than that of beryllium alloy.

On the other hand, it is known that the bonding strength between an alloy and a porcelain depends on the coefficient of thermal expansion of the metal and the thickness, composition, and roughness of the oxide layer formed on the surface of the metal. In the alloy containing no beryllium (Be) For the improvement, it is a key technology to control the characteristics of the oxide layer by appropriately designing the composition of the alloy.

Beryllium (Be) is an alkaline earth metal belonging to the second group of the periodic table and is used as a moderator and a reflector of a reactor, and is known as a harmful substance. Therefore, when exposed to high concentrations of dust for a short period of time or at low concentrations of dust for a long time, it causes acute contact dermatitis. In case of continuous exposure for more than one year, chronic lung disease, acute interstitial pneumonia, chronic beryllium poisoning . As a result, the Korea Food & Drug Administration revised the maximum allowable content of beryllium (Be) from 2% to 0.02% through the revision of the 'Medical Device Standard Partial Amendment Notice' in July 2008, and the manufacture of dental alloys containing beryllium (Be) I have ordered an import ban.

Further, in the case of the nickel (Ni) -crome (Cr) based alloy for porcelain porcelain, it replaces human teeth unlike an alloy used for other purposes, For yield strength or elongation, appropriate standards should be met. The alloys for ceramics are exposed to the fatigue load caused by the chewing motion and their lifespan depends heavily on the mechanical properties such as yield strength and elongation.

On the other hand, if the elongation rate of the alloy for porcelain forming part is small, there is a possibility that the dent casted by the dentist may be broken. If the yield strength is too high, it is difficult for the dentist to postpone the denture. Therefore, there is a demand for an alloy for a porcelain baking which has a high elongation and an appropriate yield strength for the life of a tooth and easiness of a tooth for a tooth.

However, in the case of the conventional nickel (Ni) based alloy, the yield strength, the elongation and the elastic modulus meet the above-mentioned appropriate reference value. However, beryllium (Be) . Recently, a cobalt (Co) based alloy mainly composed of cobalt (Co) has been produced in order to overcome the disadvantage of a nickel (Ni) based alloy containing harmful beryllium (Be) The product is dissolved even if a part of cobalt (Co) system having a low melting point is produced. However, due to the nature of cobalt (Co), a thick oxide film is formed when dissolving. Therefore, it is necessary to perform several polishing operations, There is a case where the bonding strength with the porcelain becomes weak due to the remaining oxide layer due to the work.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and an object of the present invention is to provide a biaxially stretched polyurethane foam which is free from beryllium (Be) and satisfies the yield strength and elongation ratio while being harmless to the human body, Chromium-cobalt-based ceramics precious metal alloy excellent in joint properties and mechanical properties between porcelain interiors that allow the tooth to be used for a long time because of low motion and high resistance to fatigue fracture.

In order to achieve the above object, the nickel-chromium-cobalt-based ceramic material for alloy according to the present invention, which is excellent in the bonding property between the porcelain metals and the mechanical properties, comprises 11.0 to 15.0 wt.% Of cobalt (Co) (Cr), 3.0 to 5.0 wt% of molybdenum (Mo), 0.4 to 0.6 wt% of aluminum (Al), 0.5 to 1.0 wt% of silicon (Si), 0.4 to 0.6 wt% (Fe), 0.15 wt% or less of boron (B), 4.0 to 5.0 wt% of niobium (Nb) and 2.0 to 3.0 wt% of tantalum (Ta) . ≪ / RTI >

And the alloy further comprises 0.5 or less weight percent of titanium (Ti).

As described above, in the alloy for a nickel-chromium-cobalt-based ceramic material for a porcelain part of the present invention, which is excellent in bonding properties between ceramics metals and mechanical properties, beryllium (Be) is added to an alloy mainly composed of nickel (Ni) and chromium (Cr) Molybdenum (Mo), silicon (Si), aluminum (Al), niobium (Nb), tantalum (Ta), titanium (Ti) and the like were added in an appropriate amount to improve the yield strength without using boron (B), iron (Fe), niobium (Nb), and tantalum (Ta) are added in an appropriate amount and an appropriate amount of cobalt (Co) is added to obtain an excellent bonding strength between the porcelain- .

Therefore, it is advantageous that the pores in the workshop and the workability in the molding process are greatly improved by having an appropriate yield strength and an excellent elongation ratio while being harmless to the human body.

Further, by improving the bonding force with the porcelain, it is possible to use the teeth for a longer time by improving the masticatory strength and the esthetics of the teeth.

In addition, since it has an excellent yield strength and room temperature elongation, it is highly resistant to fatigue cracks which may be caused by the mastic pressure when attached to the teeth, thereby reducing damage to the teeth and maintaining the durability of the teeth for a long time.

FIG. 1 is a table showing evaluation results of mechanical properties according to one embodiment of a nickel-chromium-cobalt-based ceramic material for an aluminum alloy part having excellent inter-ceramic-metal bonding properties and mechanical properties according to the present invention.
FIG. 2 is a graph showing tensile properties at room temperature according to an embodiment of a nickel-chromium-cobalt-based ceramic material for a porcelain for a nickel-chromium-cobalt-based ceramics prefectural material according to the present invention.
FIG. 3 is a graph showing a bonding strength according to an embodiment of a nickel-chromium-cobalt-based ceramic material for an aluminum alloy part excellent in bonding properties between ceramic materials and mechanical properties according to the present invention.

Hereinafter, an alloy for a nickel-chromium-cobalt-based ceramics prefectural material having excellent porcelain interfacial bonding properties and mechanical properties according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a table showing evaluation results of mechanical properties according to an embodiment of the nickel-chromium-cobalt-type ceramic material for a porcelain part of the present invention, which is excellent in joint properties between porcelain metals and mechanical properties. FIG. There is shown a graph showing tensile properties at room temperature according to an embodiment of a nickel-chromium-cobalt-based ceramic material for an alloy having excellent intermetallic bonding properties and mechanical properties.

The effect of each component element in a nickel-chromium-cobalt-based ceramic-ceramics alloy excellent in jointing properties and mechanical characteristics between the ceramic materials according to the present invention is very complicated, so that the content thereof exceeds or falls below each specific range In some cases, it is counterproductive. Therefore, in the present invention, a method of manufacturing a semiconductor device including a semiconductor substrate made of nickel (Ni) as a main component and made of chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), silicon (Si), iron (Fe), boron (B) ), Tantalum (Ta) is added in an appropriate amount, and preferably 11.0 to 15.0 wt% of cobalt, 22.0 to 27.0 wt% of chromium (Cr), 3.0 to 5.0 wt% of molybdenum (Mo) (B), 4.0 to 5.0% by weight of niobium (Nb), 2.0 to 10% by weight of tantalum (Ta), 0.5 to 1.0% by weight of silicon 3.0% by weight, and the remainder of the percentage is mixed with nickel (Ni).

Further, the alloy may be constituted so as to further contain 0.5 or less weight percent of titanium (Ti).

In the above mixture, nickel (Ni) is a material having excellent resistance to corrosion and discoloration resistance, which significantly increases the tensile strength and yield strength of the alloy and is biologically stable by the combination with chromium (Cr), and chromium (Cr) And the stability can be maintained in the oral environment by the passivation mechanism by the formation of dense oxide film. Therefore, in order to obtain the above characteristics, it is preferable that nickel (Ni) is mixed in the range of 42 to 57 wt%, and chromium (Cr) is mixed in the range of 22 to 27 wt% in order to improve the corrosion resistance.

In addition, cobalt (Co) is a non-ferrous alloy having excellent oxidation resistance, corrosion resistance, abrasion resistance and mechanical properties at high temperatures, and molybdenum (Mo) has an advantage of improving the thermal expansion coefficient and corrosion resistance and increasing the strength of the alloy Aluminum (Al) is an alloy with silicon (Si) because it can make light, high strength and durable characteristics by complementing the weak point of weakness by making alloy. It has excellent moldability and corrosion resistance, Si) has good strength and low melting point, so it has good castability. In order to obtain the above characteristics, cobalt (Co) is mixed in a range of 11.0 to 15.0 wt%, molybdenum (Mo) is limited to a range of 3.0 to 5.0 wt%, aluminum (Al) By weight, and silicon (Si) is preferably limited to a range of 0.5 to 1.0% by weight.

In addition, iron (Fe) not only improves the elongation but also improves the characteristics of the oxide layer and improves the bonding force with the porcelain. Boron (B) improves the melting point and casting of the alloy and strengthens the grain boundary Niobium (Nb) is an element having excellent biocompatibility and is an alloy with nickel (Ni). It not only lowers the melting point of nickel (Ni) but also solidifies in nickel (Ni) Tantalum (Ta) is a biocompatible element rich in malleability and ductility, and has an advantage of improving the tensile strength with an alloy of nickel (Ni). In addition, titanium (Ti) Is lightweight but very hard and has an advantage of lowering the melting point and improving the strength with an alloy of nickel (Ni). Therefore, iron (Fe) is mixed in the range of 0.4 to 0.6 wt% to obtain the above characteristics, the amount of boron (B) is limited to 0.15 wt% or less and niobium (Nb) is 4.0 to 5.0 wt , And tantalum (Ta) are mixed together at a ratio of 2.0 to 3.0 wt%, and titanium (Ti) is limited to 0.5 wt% or less.

Meanwhile, in order to obtain a mechanical characteristic evaluation result table as shown in FIG. 1, a specimen should first be manufactured.

Co Cr Mo Al Si Fe B Nb Ta Ti F5 13.0 24.0 4.0 0.5 0.5 0.5 0.1 5.0 2.0

A ferrous alloy containing 13.0 wt% of cobalt (Co), 24.0 wt% of chromium (Cr), 4.0 wt% of molybdenum (Mo), 0.5 wt% of aluminum (Al), 0.5 wt% of silicon (Si) (Nb), 2.0% by weight of tantalum (Ta) and 50% by weight of nickel (Ni) were prepared in a vacuum or argon (Ar) And the mixture is melted at a high temperature of 1500 to 1550 DEG C, and the mixture is poured into a mold and spontaneously cooled for about 1 hour to 2 hours to obtain a mechanical property evaluation result as shown in FIG.

Co Cr Mo Al Si Fe B Nb Ta Ti F6 13.0 24.0 4.0 0.5 0.5 0.5 0.1 5.0 3.0

A ferrous alloy containing 13.0 wt% of cobalt (Co), 24.0 wt% of chromium (Cr), 4.0 wt% of molybdenum (Mo), 0.5 wt% of aluminum (Al), 0.5 wt% of silicon (Si) (Ni) was prepared in an amount of 0.1 weight%, niobium (Nb) 5.0 weight% and tantalum (Ta) 3.0 weight%, and the remainder nickel (Ni) was prepared in an amount of 49.4 weight% By producing the specimen in the same manner as in the experiment, the mechanical property evaluation results as shown in Fig. 1 can be obtained.

Co Cr Mo Al Si Fe B Nb Ta Ti F7 13.0 24.0 4.0 0.5 0.5 0.5 0.1 5.0 3.0 0.5

A ferrous alloy containing 13.0 wt% of cobalt (Co), 24.0 wt% of chromium (Cr), 4.0 wt% of molybdenum (Mo), 0.5 wt% of aluminum (Al), 0.5 wt% of silicon (Si) (Ni) was added in an amount of 0.1 weight%, niobium 5.0 weight%, tantalum (Ta) 3.0 weight%, titanium (Ti) 0.5 weight% and nickel (Ni) 48.9 weight% The results of the mechanical property evaluation as shown in Fig. 1 can be obtained by preparing the specimen in the same manner as the experiment obtained.

Co Cr Mo Al Si Fe B Nb Ta Ti F8 13.0 24.0 4.0 0.5 1.0 0.5 0.1 4.0 2.0

The content of silicon (Si) is increased to 1.0% by weight and the content of iron (C) is 13.0% by weight of cobalt (Co), 24.0% by weight of chromium (Cr), 4.0% by weight of molybdenum 0.5% by weight of Fe), 0.1% by weight of boron (B), 4.0% by weight of niobium Nb and 2.0% by weight of tantalum (Ta) Thereby obtaining the result of evaluation of the mechanical properties as shown in FIG. 1, when the test piece is manufactured in the same manner as in the experiment for obtaining F5.

Co Cr Mo Al Si Fe B Nb Ta Ti F9 13.0 24.0 4.0 0.5 1.0 0.5 0.1 4.0 3.0

A ferrous alloy containing 13.0 wt% of cobalt (Co), 24.0 wt% of chromium (Cr), 4.0 wt% of molybdenum (Mo), 0.5 wt% of aluminum (Al), 1.0 wt% of silicon (Si) The test piece was prepared in the same manner as in the experiment for preparing F5 by preparing 0.1 wt% of B, 4.0 wt% of niobium, 3.0 wt% of tantalum (Ta) and 49.9 wt% of nickel (Ni) And the results of evaluation of mechanical characteristics as in Fig.

Co Cr Mo Al Si Fe B Nb Ta Ti F10 13.0 24.0 4.0 0.5 1.0 0.5 0.1 4.0 3.0 0.5

A ferrous alloy containing 13.0 wt% of cobalt (Co), 24.0 wt% of chromium (Cr), 4.0 wt% of molybdenum (Mo), 0.5 wt% of aluminum (Al), 1.0 wt% of silicon (Si) (Ti) was added in an amount of 0.5 wt%, and the remainder was made of Ni (Ni) in an amount of 49.4 wt%, so that F5 (Ti) was added in an amount of 0.1 wt%, Nb 4.0 wt%, and tantalum The mechanical properties evaluation results as shown in Fig. 1 can be obtained.

The results of mechanical properties of F are shown in comparison with Supranium (A), Nobel (B), Verabond (C), and T3 (D), which are commercially available alloy products in FIG. 1. The tensile characteristic curves at room temperature are shown in FIG. And the strength of bonding with the porcelain is shown in Fig. 3, respectively.

It can be seen that the elongation and bond strength are superior to those of commercially available alloy products Supranium (A), Nobel (B), Verabond 2V (C) and T3 (D). In particular, considering that T3 (D) is a product containing beryllium (Be) harmful to human body, the elongation as a Be-free component composition of the present invention is remarkably excellent , And the bond strength is almost the same as T3 (D).

The scope of the present invention is not limited to the above-described embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the scope of the present invention.

Claims (3)

(Co), 22.0-27.0 wt% chromium (Cr), 3.0-5.0 wt% molybdenum (Mo), 0.4-0.6 wt% aluminum (Al) (Si), 0.4 to 0.6 wt% of iron (Fe), 0.1 to 0.15 wt% or less of boron (B), 4.0 to 5.0 wt% of niobium (Nb), 2.0 to 3.0 wt% Wherein the alloy is composed of tantalum (Ta) in weight%, and nickel (Ni) in the remainder. The alloy for a nickel-chrome-cobalt-based ceramic material having excellent interlayer metal bonding properties and mechanical properties. (Co), 22.0-27.0 wt% chromium (Cr), 3.0-5.0 wt% molybdenum (Mo), 0.4-0.6 wt% aluminum (Al) (Si), 0.4 to 0.6 wt% of iron (Fe), 0.1 to 0.15 wt% or less of boron (B), 4.0 to 5.0 wt% of niobium (Nb), 2.0 to 3.0 wt% Chromium-cobalt (Ti) -based alloy having excellent interlayer metal bonding properties and mechanical properties, characterized in that it comprises tantalum (Ta) in an amount of 0.1 to 0.5% by weight and titanium (Ti) Alloy for porcelain ware.
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