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In metallography, a distinction is made between hot and cold mounting, depending on whether heat is required for the polymerization process. It must be noted that during cold mounting polymerization temperatures of up to 130 °C may arise when using, e. g., methyl acrylates.
Today, the term cold mounting is generally used for all methods where no or small pressures (<5 bar) are applied.
When it comes to the selection of metallographic mounting methods, arguments for or against a certain method can be found. The below overview presents the process differences between metallographic hot and cold mounting.
Metallographic hot and cold mounting are not in direct competition, but there is a certain overlap in application ranges. The most important criteria for compounds are hardness, abrasion resistance, shrinkage, and chemical resistance. Low shrinkage during solidification and good adhesion to the specimen are important. Without these, a gap will form between the specimen and the mounting material. This causes edge rounding, accumulation, and carryover of grinding and polishing media or the rupture of surface coatings.
The following points need to be observed as well:
Metallographic hot mounting compounds Metallographic cold mounting compounds Powder, granules or preforms are compacted under pressure and heat in a press Liquid and/or powder is mixed with hardener and poured into mounting moulds Raw material can be stored for as long as required Raw material must be stored in a cool place and has a limited shelf life Processing time for one sample is 10 to 18 minutes, a maximum of two samples per cylinder is possible Curing time for one sample is approx. 15 minutes to 12 hours. Several samples can be mounted simultaneously Duroplast: Phenolic resin (bakelit), epoxy resin Duroplast: Epoxy resin, polyester resin Polymerised to a mass that cannot be softened further Polymerised to a mass that cannot be softened further Heating up to approximately 150-200 °C under pressure (200 bar) Pay attention to temperature of polymerization during polymerization. This depends on the mixing ratio, the external temperatures, the quantity of components used and the heat dissipation of the mounting moulds Thermoplastics: Acrylates Thermoplastics: Acrylates Can be softened again, heating without pressure, cooling under pressure Can be softened again, temperature increase 50-120 °C, short hardening time
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