Does a relationship exist between hardness and compression strength for advanced ceramics?

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology Pub Date : 2024-08-23 DOI:10.1111/ijac.14893

Jeffrey J. Swab

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Abstract

The Knoop hardness (HK) and compression strength (σc) of 23 advanced ceramics were measured to determine if an overarching HK/σc relationship could be identified for ceramics, or if one exists for a specific class of ceramics, similar to the hardness/yield strength relationship (H/Y ≈ 3) identified by Tabor for metals. Compression strength was determined using a dumbbell‐shaped specimen that virtually eliminates the end splitting that occurs when cylinders or cuboids are tested and provides a more representative compression strength value. HK values were obtained over a range of indentation loads between 0.98 and 98N. Four HK values, HK2, load‐independent HK, the hardness from the proportional specimen resistance model, and a brittleness parameter, were obtained and plotted against compression strength. An overarching relationship could not be identified for ceramics in general and the only class of ceramics that had a consistent relationship was tungsten carbide/cobalt that had a HK/σc of approximately 2.5. The consistent relationship for the WC/Co materials is due to the cobalt plastically deforming during the loading processes, something that does not occur in the other ceramics evaluated.

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先进陶瓷的硬度和压缩强度之间是否存在关系？

对 23 种先进陶瓷的努氏硬度 (HK) 和压缩强度 (σc)进行了测量，以确定是否可以为陶瓷确定一个总体的 HK/σc 关系，或者是否为特定类别的陶瓷确定一个总体的 HK/σc 关系，类似于 Tabor 为金属确定的硬度/屈服强度关系 (H/Y ≈ 3)。抗压强度是用哑铃形试样测定的，这种试样实际上消除了测试圆柱体或立方体时出现的端部劈裂现象，并提供了更具代表性的抗压强度值。在 0.98 至 98N 的压痕载荷范围内获得了 HK 值。获得了四个 HK 值，即 HK2、与载荷无关的 HK、试样电阻比例模型得出的硬度以及脆性参数，并将其与压缩强度绘制成图。一般来说，无法确定陶瓷的总体关系，唯一具有一致关系的陶瓷类别是碳化钨/钴，其 HK/σc 约为 2.5。碳化钨/钴材料的一致关系是由于钴在加载过程中发生了塑性变形，而其他被评估的陶瓷则没有发生这种情况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;