Material Analysis
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CMC and filler interface bonding poor
Problem Phenomenon
The tensile strength of the CMC and filler composite material is instead lower than that of pure CMC, playing a negative role
Cause Analysis
The interface affinity between the filler and CMC is poor and no coupling agent treatment is used; the filler particles agglomerate and the dispersion particle size is >5μm; the wettability of CMC to the rigid filler is insufficient
Solution
1) Filler pretreatment with silane coupling agent KH-560 0.5-1wt%; 2) Add CMC compatibilizer 2-3wt% to strengthen the interface bonding; 3) Use ultrafine filler d50<2μm; 4) Twin-screw high-shear blending to ensure dispersion
Key Takeaway
The interface between the elastomer and the filler requires the dual action of coupling agent and compatibilizer, otherwise the filler has a negative effect
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