硅溶胶熔模精密铸造工艺的应用越来越广泛，其优越性是已经公认的事实，同时它也存在着需要改善和提高的地方，由于各个工厂所使用的原辅材料机器操作条件都不一样，所以工艺参数也是千变万化，怎样能保证铸件的成品率是一个永远的课题。
Silica sol investment casting technology is more and more widely used,
and its advantages have been recognized. At the same time, it also needs
to be improved. Because the raw and auxiliary materials and machine
operating conditions used in various factories are different, the
process parameters are also changeable. How to ensure the yield of
castings is an eternal topic.
1、精铸用粘结剂硅溶胶的技术要求
1. Technical requirements of binder silica sol for precision casting
熔模铸造用硅溶胶无国家标准，只有航空工业标准 HB5346-1986《熔模铸造用硅溶胶》技术要求，硅溶胶是一种优质硅溶胶熔模铸造用水基粘结剂，生产用于所有层（面层S830和背层S1430）。硅溶胶易配制成高粉液比的优质涂料，涂料稳定。
There is no national standard for silica sol for investment casting,
only the technical requirements of aviation industry standard
hb5346-1986 silica sol for investment casting. Silica sol is a
high-quality silica sol water-based binder for investment casting, which
is produced for all layers (surface layer s830 and back layer s1430).
Silica sol is easy to prepare into high-quality coating with high powder
liquid ratio, and the coating is stable.
