简单的设计策略朝着3D近网形立体测量SiC零件的方向发展
Maxime Cheype1, Vincent Pateloup1, Samuel Bernard1
1IRCER, CNRS, Univ. Limoges, Limoges, 87032, France.
Advanced materials (Deerfield Beach, Fla.)
|October 31, 2023
概括
沉积建模 (FDM) 适用于先进的陶,使得从预陶聚合物3D打印碳化 (SiC) 的物体. 这种方法为新的陶应用提供了复杂的几何形状,最小的收缩.
科学领域:
- 材料科学 材料科学 材料科学
- 增材制造 增材制造 增材制造
- 陶工程 陶工程
背景情况:
- 化沉积模型 (FDM) 通常仅限于热塑性塑料.
- 先进的无氧化陶提供独特的材料特性,但很难塑造.
- 预陶聚合物为陶制造提供了一条多功能途径.
研究的目的:
- 将FDM能力扩展到先进的无氧化陶.
- 为3D打印碳化 (SiC) 开发一个简单的设计策略.
- 为了利用预陶聚合物来制造复杂的陶物体.
主要方法:
- 用基于颗粒的挤出头对FDM进行修改.
- 使用商用聚碳烯前体与Si和SiC填充剂混合.
- 在120°C的温度下对聚合物进行热处理,以调整质性质.
- 在90°C下挤出,以创建3D聚碳烯结构.
- 聚合物部分的热解在1400°C以转化为SiC.
主要成果:
- 成功地3D打印了近乎网状的石化碳化 (SiC) 对象.
- 实现的特征分辨率降至400微米.
- 在热处理后,显示了9.1%的低体积收缩.
- 制造出具有高几何自由度的复杂3D架构.
结论:
- FDM可以成功地适应使用预陶聚合物制造先进的无氧化陶.
- 开发的战略允许生产复杂的,接近网状的SiC元件.
- 这种方法提供了一个多功能平台,用于设计定制的先进陶,具有量身定制的特性.
相关概念视频
Thin-Walled Hollow Shafts
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
Design of Prismatic Beams for Bending
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and stress...
Unsymmetric Loading of Thin-Walled Members
Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
The concept of the shear center is crucial in countering the...
Unsymmetric Loading of Thin-Walled Members: Problem Solving
The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...


