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首页> 外文期刊>Inorganic materials >Control over the Porosity of Plasma Sprayed Aluminum Oxide Parts by Heat Treatment
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Control over the Porosity of Plasma Sprayed Aluminum Oxide Parts by Heat Treatment

机译：通过热处理对等离子体喷涂氧化铝零件的孔隙率控制

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We have examined the feasibility of controlling porosity in the material of pure alumina parts produced by plasma spraying. To this end, we studied samples before and after heat treatment under various conditions. Porosity was determined by computed tomography and scanning electron microscopy. The phase identification and quantification were done by X-ray diffraction. The porosity of the material of pure alumina parts produced by plasma spraying was shown to vary nonmonotonically with heat treatment temperature and to be influenced by the temperature-induced polymorphic transformations of alumina. The material was shown to consist of different alumina polymorphs, which underwent polymorphic transformations, accompanied by volume changes, during heat treatment. The opposite changes in the volume of the phases involved are responsible for the nonmonotonic variation of the porosity of the material with heat treatment temperature. The observed behavior of porosity is well reproducible. This suggests that heat treatment can be used to control the porosity of pure alumina parts produced by plasma spraying.
机译：我们已经研究了通过等离子体喷涂产生的纯氧化铝部件材料中控制孔隙率的可行性。为此，我们在各种条件下热处理之前和之后研究样品。通过计算机断层扫描和扫描电子显微镜测定孔隙率。通过X射线衍射进行相位鉴定和定量。通过等离子体喷涂产生的纯氧化铝部件材料的孔隙率显示出在热处理温度下非语文学，并受到氧化铝的温度诱导的多态性转化的影响。该材料显示为包括不同氧化铝多晶型物，其在热处理期间伴随着体积变化的多态性转化。所涉及的阶段体积的相反变化是负责具有热处理温度的材料的孔隙率的非单调变化。观察到的孔隙率行为是良好的可重复性。这表明可以使用热处理来控制通过等离子体喷涂产生的纯氧化铝部分的孔隙率。

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