Extrusion & Post
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The Trade-Off of 300℃ High-Temperature Annealing of PEEK
Problembeschreibung
[Problem Phenomenon] After 300℃ annealing in pursuit of ultimate performance, PEEK parts become brittle and the surface oxidizes and discolors
Ursachenanalyse
Annealing near 300℃ can maximize strength, modulus, and chemical resistance, but is accompanied by embrittlement and surface oxidation; large-diameter parts (>6.3cm) also require 300℃ annealing for several hours when the core-surface crystallization rate difference triggers internal stress cracking
Lösung
Ultimate-performance parts may use 300℃ annealing but the embrittlement cost must be evaluated; anneal large parts to prevent crystallization stress cracking; select the annealing atmosphere and surface protection according to service requirements
Wichtigste Erkenntnis
300℃ annealing is a performance-limit means, and the embrittlement and oxidation costs must be evaluated in advance; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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