Shape distortion in sintering results from nonhomogeneous temperature activating a long-range mass transport.
Shape distortion in sintering results from nonhomogeneous temperature activating a long-range mass transport.
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DOI：
10.1038/s41467-023-38142-z
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发表时间：
2023-05-09
影响因子：
16.6
通讯作者：
Panat, Rahul P.
中科院分区：
文献类型：
--
作者：
Ritchie, Sandra M.;Kovacevic, Sasa;Deshmukh, Prithviraj;Christodoulides, Alexander D.;Malen, Jonathan A.;Mesarovic, Sinisa Dj.;Panat, Rahul P.
烧结理论预测，在颗粒聚结过程中，均匀加热的颗粒没有长距离的质量传输或变形。然而，在基于烧结的制造工艺中，经常观察到永久性部件变形。导致这一现象的驱动力和机制尚不清楚，减少扭曲的努力在很大程度上限于试错法。在本文中，我们证明了在烧结过程中的变形结果从质量传输驱动的非均匀的温度分布。然后，我们表明，迄今为止未知的质量传输机制，在相反的方向上工作的温度梯度是扭曲的可能原因。为此目的而设计的实验装置能够量化烧结过程中的变形。定义了两种可能的质量传输机制，并制定了适用于两者的连续模型。该模型准确地预测了实验过程中观察到的瞬态和永久变形，包括它们的尺寸依赖性。讨论了控制可能导致4D打印的变形的方法。形状变形是基于烧结的制造技术的一个限制，但根本原因还没有完全理解。在这里，作者研究和描述这种行为，并开发了一个连续模型来描述的效果，并提供基本的理解，以控制失真。
Sintering theory predicts no long-range mass transport or distortion for uniformly heated particles during particle coalescence. However, in sintering-based manufacturing processes, permanent part distortion is often observed. The driving forces and mechanisms leading to this phenomenon are not understood, and efforts to reduce distortion are largely limited to a trial-and-error approach. In this paper, we demonstrate that distortion during sintering results from mass-transport driven by nonhomogeneous temperature distribution. We then show that hitherto unknown mass transport mechanisms, working in the direction opposite to temperature gradient are the likely cause of distortion. The experimental setup, designed for this purpose, enables the quantification of distortion during sintering. Two possible mass transport mechanisms are defined, and the continuum model applicable to both is formulated. The model accurately predicts the transient and permanent distortion observed during experiments, including their size dependence. Methods to control distortion that can give rise to 4D printing are discussed. Shape distortion is a limitation for sintering-based manufacturing techniques, yet the fundamental causes are not fully understood. Here, the authors study and characterize such behavior and develop a continuum model to describe the effect and provide fundamental understanding to control distortion.
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影响因子：
6.2
作者：
Dehghan-Manshadi, A.;StJohn, D.;Qian, M.
通讯作者：
Qian, M.
影响因子：
1.6
作者：
Cahill, DG
通讯作者：
Cahill, DG
影响因子：
6
作者：
Saleh, M. Sadeq;HamidVishkasougheh, Mehdi;Panat, Rahul
通讯作者：
Panat, Rahul
影响因子：
13.6
作者：
Saleh MS;Hu C;Panat R
通讯作者：
Panat R
DOI：
10.1111/j.1151-2916.1989.tb06106.x
发表时间：
1989-02-01
影响因子：
3.9
作者：
BERUTO, D;BOTTER, R;SEARCY, AW
通讯作者：
SEARCY, AW