Slurry Coating (Shell Building) Step by Step
挂浆（壳体制作）步骤详解
标签：挂浆, 型壳, 粘结剂, 耐火砂
陶瓷壳挂浆是反复"沾浆—撒砂—干燥"的循环。第一层用细砂（80–120 目）沾预湿浆（硅溶胶或水解乙酯），确保拓印蜡模细节；之后每层砂目递增（至 30–50 目）并干燥 1–4 小时。石膏型则一次性真空灌注石膏浆，振动排气后自然固化。层数决定壳厚：小件 6–8 层，大件 10–12 层。每层必须彻底干透，否则脱蜡时爆裂。
Ceramic-shell building is a repeated dip–stucco–dry cycle. The first coat uses fine sand (80–120 mesh) with pre-wet slurry (colloidal silica or ethyl silicate) to capture detail; later coats use coarser sand (to 30–50 mesh), each drying 1–4 h. Plaster investment is a one-shot vacuum-poured gypsum slurry, vibrated to de-air and cured. Coat count sets shell thickness: 6–8 for small, 10–12 for large. Every layer must be fully dry or the shell cracks during dewaxing. ---