Borax powder was added at the end of the 18th Century to produce a favourable foamingeffect.
为了产生较佳的泡沫效果，18世纪末牙粉中又添加了硼砂粉。
2
The influence of foamingeffect on bubble stability of foam aluminum prepared by powder metallurgy was studied, with relevant influencing factors analysed.
Even if simultaneously ls changing the component and its flow capacity situation both may guarantee the very quick pouring rhythm and to guarantee the well foamingeffect.