Fig. 2. This is a high tempera- ture aggregate dilatometer used for measuring thermal expansion of sand samples.


砂量测й用是ङॐي֣本 ֣ 胀膨砂温高ङӑە胀膨热ս样 ઋ。


modest improvements to the properties of silica sand to yield significant casting quality benefits. Silica sand is the most widely used aggregate in the


metalcasting industry. Its low cost due to its abundance makes it an attractive option to metal casters. However, steel and iron castings in silica-sand molds tend to exhibit defects such as veining and fins. Tis is, in part, due to the


。ञ效量ૅ造铸ङם巨生ф此


硅砂是铸造Џӄ最广泛҅用ङ材料。硅砂խ量Й ，是Ѹ。力引吸有常非Դ造铸ث，Ѻ极本成৲֜，ئ 硅砂铸型ӄङ铸钢或铸铁铸ў容易ӟ现ਉ়չ飞边ঈ 硅ثӹФ。ਚ۱性胀膨热ङם巨砂硅О֜是这。陷缺


Fig. 3. Shown is the base- line silica thermal expan- sion curve.


Table 2. The Sinter Temperature, Peak Viscosity and Specific Heat Capacity Results 果গ؟热Ѽҿո度॰Қِ、度温গ烧 表


Sample ID 样ռ/*


Baseline Silica 砂硅ӕׂ


Silica With 10% Zircon խ有 锆ਸ਼砂ङ硅砂


Silica With 20% Zircon խ有 锆ਸ਼砂ङ硅砂


Silica With 30% Zircon խ有 锆ਸ਼砂ङ硅砂


Silica With 40% Zircon խ有 锆ਸ਼砂ङ硅砂


Silica With 7.5%Chromite խ有 铬铁矿砂ङ硅砂


Silica With 10% Chromite խ有 铬铁矿砂ङ硅砂


Silica With 30% Chromite խ有 铬铁矿砂ङ硅砂


Sinter Temp. (C) 烧গ温度（)） 1437.4


1252.7 1238.6 1234.3 1231.1 1255.7 1165.1 1153.1


Peak Viscosity (Pa.s) 6G Y 度॰Қِ 5.030x108


9.282x108 8.819x108 1.122x109 1.724x109 1.084x109 8.857x108 5.637x108


Specific Heat Capacity at 1,200C(J/g.C) ؟热Ѽҿ的Ї ) 0 M )


1.2 1.1 1.09 1.07 1.07 1.04 1.04 0.98 46 | FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION March 2017


硅ӕׂдॐي֣本 ֣ 砂热膨胀曲ি。


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