jeLLOw pAgeS,工具。

Monday, September 05, 2011

SanDIY casting, attempt 3。


Liquid glass / water glass (sodium silicate / Na₂SiO₃) is another choice for making a sand casting mould. The seller told me that after mixing the substances, they will harden the mould by injecting CO₂ to it for industrial use, but in my case he wasn't sure if it would work as my mould is tiny and I haven't got CO₂ and the tools.

I am going to give a try anyway. I didn't inject CO₂ to the first mould either and it worked.

水玻璃(矽酸鈉)是沙/砂模鑄造製模的另一種材料選擇。一般工業使用的沙/砂模,在成型之後會注入二氧化碳,讓模具硬化再進行灌模。

就算我呼一包二氧化碳也沒有工具注進模具體。先試。



矽砂:水玻璃=10:1,效果尙可,不過沒有經過硬化的砂模的確小鬆軟。壓入模型物的時候比起壓入黏土粉配方模輕鬆,不需要用槌子。可能是因為水玻璃的質地黏滑吧。分離上下模的時候有些矽砂掉落。

I mixed the silica sand and Na₂SiO₃ in the proportion of 10:1 for the first try. The mixture was soft and had a greasy texture, and little silica sand fell from the mould when I separated the top and bottom rings.

I decided to make another mould and leave it for a while, in order to see if a 'hardened' mould would be a better one. I came back after 15 minutes. It looked quite close to the first mould but harder and crispier, and about the same amount of silica sand fell from the mould.


未經過硬化程序的砂模質地比較鬆軟,稍微有外力擠壓就有破碎的可能(還沒製作氣孔與澆鑄通道呢!)。於是我製作第二個砂模,室溫乾燥十五分鐘之後將上下模分開……稍微乾燥之後,砂模硬了一點,不過比較像是心有餘而力不足的硬化~質地變得比較脆些,掉落的矽砂量與第一個砂模相差不多,但比較像是「剝落」而不是「掉落」。

再試。以10:2的比例混合矽砂與水玻璃,第三個砂模的質地,與第二個相差不大,不過質地較黏,分離上下模的時候不夠乾淨俐落(無論是否經過室溫乾燥都是如此),連模型物都黏。


I made the third mould with silica sand and Na₂SiO₃ in a proportion of 10:2. It was not so different to the previous ones, except the texture is stickier so that the mould was not neat and tidy. CO₂ is absolutely needed.

我想我暫時先回到最初的配方吧。


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