各种型号20-200目铸造用砂

型号20-200种类电熔陶粒规格各种材质铝土矿粒度20-200（目）适用范围铸造用砂

铸宝砂(nfsceramsite = nice foundrysand)是对熔融状态下的高氧化铝质的原料（铝矾土）进行喷雾处理，使之再结晶而得到的高耐热性，低热膨胀，球状人工铸造砂。铸宝砂(nfs)系列铸造陶粒砂产品在性价比上优于铬铁矿砂、锆英砂，为铸造行业提高铸件质量，降低成本，减少污染开辟了有效途径。是目前世界上较为理想的新型铸造用砂,具有广阔的发展前景。

nice foundry sand(nfsceramsite) is a kind of a newartificial foundry sand that is ball-shaped, high heat-resistant,low heat dilating rate.nfshas advantageof cost and performance than chromite sand and zircon sand thatprovide the effective ways to increase improve the of thefoundry, cost-down and less damage to the environment. it is thebest selection to put thenfsinto use inthe field foundry and has good vision ofdelelopment.

一．铸宝砂铸造陶粒主要技术指标

1、主要化学成分：al2o3≥75%fe2o3≤5%

tio2:2.5%-3.5%sio2:8-12%其它：微量
2、粒形：球形
3、角形系数：≤1.1极似球状
4、密度（堆集密度）：1.95-2.05(g/cm3)
5、耐火度：≥1790℃
6、热膨胀率：0.13%（1000℃加热10分钟）

ⅰ.nfsmajorchemical element and physical parameter

1.main chemicalelement:

al2o3≥75%, fe2o3≤5%, tio2: 2.5%-3.5%,sio2: 8-12%,else: tittle.

2. shape: ball shape

3.angle factor:≤1.1, very close toball

4.bulk density: 1.95-2.05(g/cm3)

5.refractoriness:≥1790℃

6.thermal expansion :0.13%（10 minutes at1000℃）

二．铸宝砂铸造陶粒具有如下优点

1.球状粒形

粒形接近真圆，表面光滑，无凹凸脉纹。其流动性及填充性好，能得到良好的成型性和铸模强度。溃散性好，易于清砂作业。粘结剂使用量较其他同类型砂有较大的节省。

2.热膨胀率低

热膨胀率之低于铬矿砂等特殊砂相同，所以，生产铸件的尺寸精度高，破裂及表面缺陷少，铸件成品率高。

3.耐破碎性好

铸宝砂的致密性好，强度高，即使重复再生使用也很少破碎，减少铸造生产过程中的粉尘对生产环境的污染，再生性好，减少产业废物排放，利于环境保护。

4.耐火性好

主要成分是氧化铝，所以耐火性能很好。耐火度≥1820℃能满足铸造各种金属及合金。

ⅱ.nfsceramsitefeatures namely advantages asfollows

1.roundsolid ball shape: the shape is mostly close toball with smooth surface and lower specific surface area.andnfshas very good air permeability goodli and easy to fill that can make the surface perfect whenfounded. further more,nfscan flow veryeasily and easy to clean. the less felting liquid can be used thanother sand whenusingnfs.

2. lower thermal expansion rateand thermal conductivity: it is just this characteristicthat make the foundry more precisely, less cracking and highoutput. improve foundry .

3. lower cleavage breakagerate:nfshashigh density and has very low cleavage breakage rate. easilyreclaimed that make it more protect environment for the less sandpowder occurred.

4. high refractoriness andservice temperature :major element isal2o3that has very good refractoriness. theservice temperature is beyond 1820℃that can make it possible to found mostof the metal fares.