This article mainly describes the advantages and applications of different materials crucible.
1. Tungsten boat:
· High temperature resistance: Tungsten boat has excellent high temperature resistance and can withstand the vacuum evaporation process at high temperature.
· Thermal conductivity: Tungsten has good thermal conductivity and can provide uniform heating, which helps to obtain uniform film deposition.
Stability: tungsten is relatively stable at high temperature, not easy to oxidize, suitable for evaporation under high temperature conditions.
2. Boron nitride crucible:
· Adhesion resistance: boron nitride crucible has good adhesion resistance, which can reduce material residue and pollution.
· Electrical conductivity: boron nitride(BN) crucibles usually have low electrical conductivity, which is helpful for certain processes where electronic conduction needs to be controlled.
· Chemical inertia: boron nitride crucible is relatively inert in many chemical environments and is not susceptible to corrosion.
3. Alumina crucible:
· High temperature/corrosion resistance/high strength: used as sliding gate for steelmaking, crucible for smelting high purity metal or growth of single crystal, as well as various high temperature kiln structural parts (furnace cavity, furnace tube), physical and chemical utensils, aerospace spark plug, heat resistant oxidation resistance coating, glass wire drawing crucible.
4. Quartz crucible
Quartz crucible can be burned below 1700 degrees, but the burning temperature above 1100 degrees quartz will become opaque, so the melting temperature should not exceed 800 degrees.
· Can not contact with HF, at high temperature, easy to interact with caustic alkali and alkali metal carbonate.
Quartz crucible is suitable for melting samples with K2S2O7, KHSO4 as the flux and Na2S207(first dried at 212 degrees) as the flux.
· Quartz is brittle and easy to break, so pay attention when using.
· Except HF, ordinary dilute inorganic acid can be used as cleaning solution.
5. Corundum crucible
· Corundum crucible is composed of porous fused alumina, which is firm and resistant to melting.
· Corundum crucible is suitable for using anhydrous Na2C03 and other weakly alkaline substances as the melt sample, not suitable for using Na202, NaOH and other strongly alkaline and acidic substances as the melt sample (such as K2S207, etc.)
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