1、 Metallurgy and Materials Science

In metal smelting, alloy preparation, and powder metallurgy, graphite crucibles are widely used for melting non-ferrous metals such as copper, aluminum, and zinc due to their high thermal conductivity and temperature resistance (up to 3000 ℃); Corundum (Al2O3) or zirconia (ZrO2) crucibles are used for vacuum induction melting of active metals such as titanium and zirconium to avoid metal contamination. In the development of new materials, crucibles are also used for high-temperature processes such as crystal growth (such as sapphire single crystal) and ceramic sintering.

2、 Chemistry and Analysis Laboratory

Platinum or quartz crucibles are commonly used in standard operations such as ash content determination, incineration residue, and sample pretreatment in universities and quality inspection institutions (such as GB/T5009, ASTME1019). For example, for ash content detection in food, the sample needs to be placed in a porcelain crucible and burned in a muffle furnace at 550 ℃ until constant weight is reached; In ICP-MS pretreatment, high-purity quartz crucibles can avoid trace metal contamination and ensure detection accuracy.

3、 Semiconductor and Photovoltaic Industry

In the preparation of monocrystalline silicon, high-purity quartz crucibles (SiO2 ≥ 99.99%) are used to hold polycrystalline silicon raw materials, which are melted at 1420 ℃ or above in the Czochralski method (CZ method). Their low impurity precipitation characteristics directly determine the purity and minority carrier lifetime of the silicon rod. Any infiltration of metal ions (such as Fe, Na) can lead to a decrease in battery efficiency, therefore high requirements are placed on the purity and structural density of the crucible.

4、 Glass and Ceramic Industry

In glaze formula experiments, laboratory commonly uses corundum or mullite crucibles for small batch melting to observe the fluidity, gloss, and hue of the glaze surface; In the research and development of special glass (such as optical glass and medicinal glass), platinum rhodium alloy crucibles have become a key carrier for melting high value-added glass due to their chemical inertness and high temperature stability.

5、 Environmental Protection and Solid Waste Treatment

In the determination of calorific value of hazardous waste or analysis of incineration residue, nickel based alloy or silicon carbide crucibles can withstand the erosion of highly corrosive chlorides and sulfides, ensuring experimental safety and reliable data. Some cement kiln collaborative disposal projects also use large refractory crucibles to simulate the incineration process.