**4. Conclusions**

The silane controllable recycled carbon fiber can effectively simplify the process of rCF reuse in suitable applications. Through adjusted silane content, the dispersion of rCF in organic or inorganic materials was improved for use in the manufacture of highperformance composite materials.

This study successfully demonstrates control of the silane content on the rCF surface. Different microwave pyrolysis methods and temperature conditions were compared. The results show that the microwave pyrolysis method achieves better resin removal when compared with traditional thermal treatment methods at the same temperature. Over 450 ◦C, the SEM/EDS results show the recovered surface of the carbon fibers are absent of oxygen. Compared with the GBW sample, no additional defects were observed. Moreover, the resin and silane removal uniformities were examined from recovered carbon fiber in large scale wastes. At different crucible position, the difference of maximum silane content is about ±0.33%. Moreover, a higher treatment temperature can reduce this difference.

The results during microwave pyrolysis could be reproduced for this CFRP waste of Giant Bicycles discussed in this article. However, a multitude of influencing parameters affect the reclamation of carbon fibers, such as matrix material, temperatures, atmosphere composition, etc. This complicates the recycling process control to reclaim high quality fibers. Further research into the decomposition behavior of CFRPs recovered from other, commonly recycled industrial composite materials is required.

**Author Contributions:** ConceptualizationConceptualization, K.-Y.C. and S.-M.C.; data curation, K.-Y.C. and Y.-J.W.; formal analysis, K.-Y.C. and Y.-J.W.; investigation, K.-Y.C. and A.S.; methodology, K.-Y.C., Y.-J.W. and S.-M.C.; project administration, K.-Y.C. and Y.-J.W.; supervision, A.S., S.-M.C., Y.-F.L. and M.-Y.S.; writing—original draft, K.-Y.C. and A.S.; writing—review and editing, A.S., G.L., Y.-F.L., S.-M.C. and M.-Y.S. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the Ministry of Science and Technology of Taiwan (108-2218- E-027-005, 109-2221-E-027-113), the Ministry of Education in Taiwan, and the Topkey Corp. Taiwan.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
