Top Posts Tagged with #aluminacrucible

The difference between boron nitride crucible and alumina crucible

As an important part of chemical equipment, ceramic crucible is a container for melting and refining liquid metal and heating solid-liquid reaction. It is the basis for ensuring the smooth progress of chemical reactions. There are many types of crucibles. According to the raw materials, ceramic crucibles can be divided into boron nitride crucibles, alumina crucibles, zirconia crucibles, aluminum nitride crucibles, quartz crucibles, etc. Here we mainly introduce the difference between boron nitride crucibles and alumina crucibles. The advantages of boron nitride ceramics compared to alumina ceramics are: 1.The temperature is high, and the long-term use temperature of boron nitride under vacuum is 1800 degrees, and the long-term use of 2100 degrees under the protection of the atmosphere. Alumina does not exceed 1700 degrees. 2.Strong thermal shock resistance, rapid cooling and no cracking. The boron nitride ceramics are taken out of the 1000 degrees furnace and quenched by the air blower, and will not crack even if repeated 100 times. 3.It is resistant to acid and alkali corrosion, has strong electrical insulation, and has a resistance to electrical breakdown of 3 to 4 times that of alumina. 4.Boron nitride ceramics do not react with many metals, ceramics, rare earth and other materials. Such as ferrous metal, iron, copper, stainless steel, tantalum, aluminum, tin, chromium, lead, nickel, magnesium, etc., glass melt, soda glass, cryolite, etc., silicon lava: slag, fluoride and the like. It can be used as a container, enamel, setter, etc. The disadvantages of boron nitride ceramics compared to alumina ceramics are: 1.Boron nitride ceramics have lower strength, hardness and wear resistance than alumina, and are not suitable for use in vibration and friction environments. 2.Boron nitride ceramics should not be used in the air at temperatures exceeding 1000 degrees. Exceeding oxidation, boron nitride can only be used up to 2000 degrees under vacuum or atmosphere protection. Innovacera's engineers are constantly exploring the improvement of crucible, and we will give suggestion for material selection when inquiry. If you have any questions, please do not hesitate to contact us.

Boron Nitride Crucible / Alumina Ceramic Crucible Read the full article

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How to choose crucibles in TGA experiments?

Alumina Crucible (Ceramic Crucible) is the most commonly used crucible in TGA experiments. It is relatively stable for most samples and doesn’t react with the samples. In the range of room temperature to 1650°C, the alumina crucible has no thermal reaction. The melting point of the aluminum oxide crucible exceeds 1700℃, which can be used repeatedly. During the TGA test, the crucible must be open. But before the actual test, it is also very important to seal the crucible, because this can prevent the sample from contacting the air before the test and prevent the moisture in the sample from evaporating before the test. The crucible can be drilled before the experiment, and this process can be done well on the autosampler during the experiment. Under normal circumstances, the crucible used in the TGA experiment is 70uL alumina crucible, but sometimes other special crucibles are also required for thermogravimetric experiments. If you want a colleague in the thermogravimetric test to obtain a better synchronized DSC curve, you can use a 40uL aluminum crucible with a temperature below 600 degrees Celsius. If the sample has very few volatile components or is very uneven, use as many samples as possible in this case. At this time, use a larger crucible, such as 150uL alumina crucible or 900uL alumina crucible. INNOVACERA supplies all kinds of ceramic crucibles now, welcome to inquiry. Read the full article

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