This is NiCr Porcelain Metal (Be 1.8)
- Product Application Range: Suit dental labs for casting crowns,
bridges and combination.
- Spec. & Model:KC-I(Nickel-chrome Porcelain Alloy)
- Summary: This product according as Shanghai Factory Standard
Q/SUMZ01.2004 and Standard YY0621-2008 and Standard
ISO/FDIS9693-1999, and made by cobalt, chrome , molybdenum and so
on. The performance of alloy is good and easy to use.
- Physical and Chemistry Performance:
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- b. Coefficient of expansion: 13.9×10-6/℃ (20～500℃)
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- d. Break off/craze original intension≥25 Mpa
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- e. Tensile strength: ≥250 N/mm2
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- f. Alloy liquidus or solidus curve temperature: 1160～1280℃
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- g. Modulus of elasticity: 200 GPa
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- h. Corrosion resistance 7d above the release of ions is less than
total average accumulation 0.1 mg/cm2
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- i. Alloy composition(%):Nickel 75~80; Chrome 11.5~14.5; Molybdenum
4.5~6.5; Aluminum 1.5~3.5; Be 1.8; Other
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- Equipment
- a. When casting can use high-frequency centrifugal casting machine
or spring centrifugal casting machine. Casting after dissolved by
acetylene-oxygen.
- b. Casting can use casting furnaces for crowns and bridges to
pre-oxidation and ceramic sintering.
- c. The highest temperature 1200℃ thermocouple temperature control
bow-type furnace and blast cleaning machine.
- Operation Method
- Mold: In order to ensure casting fluid of mild, thickness of wax-ups
should not be less than 0.5mm. Casting pipe can be prepared by
ordinary manner. If it is a higher amount of metal crowns or
bridges, the experiment proved that can set saving room.
- Investment: Suit for all the investment materials in the market. In the
process of removing wax and reheating, should according to the use
manual offered by investment factory, especially preheating time.
Through validation, the suitable temperature is 900℃.
- Casting: Melting in the ceramic crucibles, and draw the steam out at the
same time.
- Note: Do not use graphite crucibles!
- Open flame melt: Using acetylene and oxygen to be fuel. Care the user manual of
fuel supplier.
Precisely adjust of flame intensity can
affect the purity of alloys.
- HF/open flame melt: Do not need latent solvent. After melting of alloy and shadow
disappeared about two seconds, then begin casting.
- After casting, mold ring should cool down, and then deflate. Do not
use water to cool down.
- Suggest do not use alloy repeatedly, because in the process of
melting, the oxide will vaporize which is important to metal and
casing connection. After several times of melting, the composition
will be reduce, and it will do harm to the quality of material and
casting connection. Then use ordinary stereoplasm alloy file or
aluminum oxide ore to process, the thickness of crowns will be at
less 0.2mm to 0.3mm. In the processing of different types of
alloys, suggest use the same type rotary instruments avoiding
influence the alloy.
- Casting material: Should note the coefficient of expansion of the casting material,
and cooling time should not be too long.
- Cast Firing: Do not need oxidation firing. If use oxidation firing, should
heat to 980℃ for 10min, and then use alumina to spray sand, finally
use distilled water washing, ultrasonic washing or steam washing.
Washing and firing should according to casting manual. Suggest
after firing, do this job after firing plate cool down.
- Promise: The manual is based on our practical experience; the
responsibility of the right application is on the user. The loss
and compensate requirements due to the manual should refer to the
worth of delivery products.
- Cautions
- a. The room of finishing should have good air pump, staff should
wear protecting respirator, avoid of inhale metal dust.
- b. This product includes Nickel, the people who have nickel-allergy
should be cautious.
