
[陶瓷] 显气孔率;虚表孔率
These products have very compact structure, low apparent porosity, high refractoriness, and excellent corrosion resistance.
该产品具有组织结构致密、显气孔率低,耐高温、耐侵蚀能力强等特点。
The apparent porosity and water absorption were the lowest, the bulk density and heat-resistant property were the highest after dipping for 4 times.
材料性能随浸渍次数增加而优化,浸渍4次的显气孔率和吸水率最低,体积密度和热稳定性最高。
With the increase of sintering temperature, the apparent porosity of sample decreases, while bulk density, hardness and compressive strength increased.
随烧结温度的升高,材料的显气孔率降低,而体积密度、硬度和抗压强度均增加。
The low density drilling fluid has borehole excavation effect on compensated neutron porosity logging, and by this way apparent porosity is lower than the true value.
低密度井眼流体会对补偿中子孔隙度测井产生井眼挖掘效应,使视孔隙度值低于真孔隙度,且井眼流体密度越小,井眼尺寸越大,地层孔隙度越大,井眼挖掘效应越明显。
It is shown that the changes of is resulted from the changes of both apparent porosity and the distance between layers of gel-type montmorillonite in interparticle pores.
结果表明,膨润土饱和渗透系数的变化是由表观孔隙率和凝胶体蒙脱石层间距离的共同作用引起的。
表观孔隙率(apparent porosity) 是材料科学(特别是陶瓷、耐火材料、粉末冶金等领域)中表征多孔材料结构特性的关键参数。其定义为:材料中开口气孔(即与外界连通的孔隙)所占体积与材料总体积(包含开口气孔)的百分比。
定义与计算
表观孔隙率((P_a))通过阿基米德排水法测定,公式为:
$$ Pa = frac{W{text{sat}} - W{text{dry}}}{W{text{sat}} - W_{text{imm}}}} times 100% $$
其中:
该公式基于国际标准测试方法(如ASTM C20)。
与真实孔隙率的区别
工程意义
ASTM C20《Standard Test Methods for Apparent Porosity, Water Absorption, Apparent Specific Gravity, and Bulk Density of Burned Refractory Brick》
《陶瓷材料学》(科学出版社)指出:“表观气孔率反映材料中开口气孔的数量,直接影响材料的渗透率和烧结质量。”
中国耐火材料协会《多孔陶瓷性能测试规范》强调表观孔隙率是评估材料服役寿命的核心指标之一。
注:以上引用来源基于行业标准与学术文献,链接仅示例权威机构官网(如ASTM),实际文献需通过学术数据库获取。
Apparent Porosity(表观孔隙率)是材料科学中的专业术语,指材料中可见孔隙体积占材料总体积的百分比。以下是详细解释:
常见方法包括:
如需更专业的测试标准或具体领域案例,可参考材料科学实验手册或行业规范。
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