What is the difference between silicon carbide crucibles and graphite crucibles

What is the difference between silicon carbide crucibles and graphite crucibles

Difference 1: Different materials

Graphite crucible, also known as graphite clay crucible, is mainly composed of natural flake graphite as the main material and clay as the adhesive.

Silicon carbide crucible: mainly composed of natural flake graphite and silicon carbide, with high-temperature resin as the adhesive.

Difference 2: Different processes

Graphite Crucible: Artificially spun, mechanically pressed from small crucibles. After forming, it is sintered in a kiln at 1000 degrees Celsius and coated with anti-corrosion glaze or moisture-proof paint to become a complete crucible.

Silicon carbide crucible: It is made by using advanced isostatic pressing equipment and a scientific formula for pressing. (Pressure 150 megapascals).

Difference three: Differences in performance

The density of graphite crucible is 1.3kgcm2, and that of silicon carbide crucible is 1.7-2.6kgmm2. The service life of graphite crucibles is 3-5 times shorter than that of silicon carbide crucibles. The temperature difference between the inside and outside of the crucible is 35 degrees for graphite crucibles and 2-5 degrees for silicon carbide crucibles. There is a significant difference in acid, alkali, and corrosion resistance, and an energy saving difference of about 50%.

Difference four: Different prices

The price difference between graphite crucibles and silicon carbide crucibles is about three times.

1. Graphite crucibles have good thermal conductivity, but they are prone to oxidation and have a high damage rate, while silicon carbide crucibles have a larger volume and longer service life compared to graphite crucibles;

2. The silicon carbide crucible is a bowl shaped container with a deep ceramic bottom. When a solid needs to be heated with high heat, a crucible must be used. Because it can withstand high temperatures better than glassware;

3. When using a silicon carbide crucible, the melted material is usually not filled too much to prevent the heated material from jumping out and allow air to freely enter and exit for possible oxidation reactions;

4. Silicon carbide crucibles, due to their small bottom, generally need to be placed on a mud triangle to be heated directly by fire;

5. The silicon carbide crucible can be placed directly or diagonally on an iron tripod, and can be placed on its own according to experimental needs;

6. After heating, do not immediately place the silicon carbide crucible on a cold metal tabletop to avoid it breaking due to rapid cooling;

7. Silicon carbide crucibles should not be placed immediately on wooden tabletops to avoid scalding or causing fires;

8. Silicon carbide crucibles have the characteristics of high volume density, high temperature resistance, fast heat transfer, acid and alkali corrosion resistance, high temperature strength, and high oxidation resistance compared to graphite crucibles. Their service life is 3-5 times that of clay graphite crucibles

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