Discussion Overview
The discussion revolves around the selection of a suitable crucible for experiments involving molten Lead Fluoride and Crayolite in an electric muffle furnace. Participants explore various materials for crucibles, considering their melting points and compatibility with the substances being used.
Discussion Character
- Exploratory, Technical explanation, Debate/contested
Main Points Raised
- One participant suggests that platinum crucibles are too expensive and questions the suitability of alumina crucibles.
- Another participant proposes graphite as a potential alternative, noting that alumina theoretically has a higher melting point than both cryolite and Lead Fluoride, but emphasizes the importance of the maximum process temperature.
- A participant expresses interest in synthesizing Corundum Crystals and mentions a maximum operating temperature below 1200 Celsius, inquiring about the use of zirconia crucibles.
- There is a question about whether cryolite can dissolve zirconia or graphite as it does with alumina, with a request for phase diagrams that are not readily available.
- One participant admits to not having experience with cryolite and expresses a need to research its compatibility with the proposed crucible materials.
Areas of Agreement / Disagreement
Participants do not reach a consensus on the best crucible material, with multiple competing views regarding the suitability of graphite, alumina, and zirconia. The discussion remains unresolved regarding the compatibility of these materials with cryolite.
Contextual Notes
Limitations include the lack of available phase diagrams and the uncertainty regarding the compatibility of cryolite with different crucible materials.
Who May Find This Useful
Researchers and practitioners interested in materials science, particularly those working with high-temperature processes and the synthesis of specific crystal structures.