What is alumina crucible?
Alumina Crucible is made of raw material aluminum oxide. Alumina is a ceramic material with high thermal conductivity, compressive strength, high temperature resisitance and thermal shock resistance. In addition, it can be easily combined with metals and other ceramic materials using brazing techniques and metalizing.
How do you use alumina in the crucible?
We recommend placing your crucibles on top of a substrate plate of same material to reduce the risk of thermal shock. We recommend a heating rate of 150°C/ hr so that the crucibles can be evenly heated. Lower the temperature as gradually as possible. The cooling down rate is often half of the heating rate.
How do you clean alumina crucibles?
For cleaning very heavily contaminated alumina crucibles, the following process has proven itself: soak the crucibles for at least 24 hours in aqua regia (3 parts concentrated hydrochloric acid and 1 part concentrated nitric acid) and boil for 3 hours in this solution (aqua regia dissolution).
How much sample do you need for TGA?
The sample size should be between 2 and 50 mg. If you have minimum amount of sample, run at least 1 mg. If possible, cover the bottom of the pan with the sample material. The sample pans, ceramic or platinum, can accommodate liquids, powders, films, solids or crystals.
How are alumina crucibles made?
Aluminum oxide is refined industrially from bauxite ore, which contains aluminum. After several purification processes, a substance called calcined alumina is obtained, which contains mostly alumina with some impurities, mainly sodium oxide. Calcined alumina is often used to make crucibles.
What is silica crucible?
Full Description. The QC (Quartz-crucible) of high purity Silica (SiO2) material, is a transparent container which is resistant to extremely high temperatures as well as being chemically inert to get non-contaminated results. These are efficient for use as laboratory crucible as well as in industrial applications.
How do you clean alumina tubes?
All Answers (3) What kind of material do you want to remove from the alumina tube? If these are organic compounds, tars or pyrolytic carbon, the safest way is just heating slowly the tube up to 1000°C in air and let the organic matter burn completely until you recover a nice, clean, white tube.
How do you clean ceramic alumina?
This is done by immersing the ceramic in a heated solvent (heating to increase activity) and then placing them inside an ultrasonic cleaner for at least 15 minutes. The solvent is then rinsed off using deionized or distilled water, which removes any loose contaminants from the surface.
What is the difference between TGA and DSC?
TGA stands for Thermal Gravimetric Analysis, and DTA stands for Differential Thermal Analysis while DSC stands for Differential Scanning Calorimetry. The main difference between TGA DTA and DSC is the method of measuring the changes in samples that are caused by heat.
Is alumina crucible made of porcelain?
Crucibles and their covers are made of high temperature-resistant materials, usually porcelain, alumina or an inert metal. One of the earliest uses of platinum was to make crucibles. Ceramics such as alumina, zirconia, and especially magnesia will tolerate the highest temperatures.
