1：Experimental Design and Method Selection:

The study involved in-situ synthesis of nano-SiC whiskers in a Li2O-Al2O3-SiO2 ternary system using carbothermal reduction and mechanisms like Liquid-Solid (LS) and Vapor-Solid (VS). Raw materials were mixed, formed into compacts, and sintered in a carbon bed in a molybdenum disilicide furnace at temperatures from 1400 to 1460 °C with a heating rate of 5 °C/min and holding time of 2 hours.

2：Sample Selection and Data Sources:

Samples were prepared with varying Li2CO3 additions (0 to 2.22 wt%) and sintered at different temperatures. Natural raw materials included kaolin, spodumene, quartz, graphite, and silicon powder.

3：22 wt%) and sintered at different temperatures. Natural raw materials included kaolin, spodumene, quartz, graphite, and silicon powder. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included a ball mill for mixing, uniaxial press for forming, electrical oven for drying, molybdenum disilicide furnace for sintering, electronic analytical balance for density measurements, electronic universal test machine for bending strength, laser flash thermal constant analyzer for thermal conductivity, thermal dilatometer for CTE, X-ray diffractometer for phase analysis, SEM and TEM for microstructure observation, and EDS for elemental analysis. Materials included Longyan kaolin, spodumene, quartz, graphite, silicon powder, Li2CO3, and PVA binder.

4：Experimental Procedures and Operational Workflow:

Powders were mixed by ball milling, formed into compacts under 10 MPa pressure with PVA binder, dried at 100 °C for 24 hours, sintered in a carbon bed at specified temperatures, and characterized for physical, mechanical, and thermal properties.

5：Data Analysis Methods:

XRD patterns were analyzed using the Reference Intensity Ratio (RIR) method for semi-quantitative phase content. SEM and TEM images were used for microstructure analysis. EDS was used for elemental composition. Physical properties were measured using Archimedes' principle, bending strength tests, and thermal property measurements.