Improving fracture toughness and densification behavior of single-phase TaC–HfC ceramic with carbon additives

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

International Journal of Applied Ceramic Technology Pub Date : 2024-12-02 DOI:10.1111/ijac.15000

Firouz Rezaei, Mahdi Ghassemi Kakroudi, Vahideh Shahedifar, Zohre Balak

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Abstract

This investigation was undertaken to determine the role of carbon additives on the densification behavior and fracture toughness of TaC–HfC ceramic. The composition of TaC-19 vol% HfC-5 vol% VC with 10 vol% nano graphite/10 vol% nano carbon black was sintered by hot-pressing (HP) method. Also, the sintering temperature varied from 1700°C to 2000°C. Vanadium carbide was used as a sintering aid to minimize the porosity for the given hot-pressing temperatures while keeping the consolidation temperature low. The analysis of XRD patterns revealed that the sintering process led to the formation of a ternary solid solution in the samples accompanied by the entire consumption of HfC and VC phases. Also, the presence of carbon additives increased the relative density from 96% to 100% by enhancing the sintering temperature from 1700°C to 2000°C. It was significantly higher than the carbon-free sample, which had a maximum value of 96.7% at 2000°C. The results also indicated that the maximum fracture toughness of 7.1 MPa.m^1/2 was obtained for nano carbon black contained samples at the sintering temperature of 1900°C and above. The toughening mechanisms in samples were discussed, too.

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添加碳提高单相TaC-HfC陶瓷的断裂韧性和致密化性能

研究了碳添加剂对TaC-HfC陶瓷致密化性能和断裂韧性的影响。采用热压法制备了TaC-19 vol% HfC-5 vol% VC与10 vol%纳米石墨/10 vol%纳米炭黑的复合材料。烧结温度在1700 ~ 2000℃之间变化。在给定的热压温度下，使用碳化钒作为助烧剂使孔隙率最小化，同时保持较低的固结温度。XRD分析表明，烧结过程导致样品中形成三元固溶体，同时HfC和VC相全部消耗。此外，碳添加剂的存在通过将烧结温度从1700℃提高到2000℃，使相对密度从96%提高到100%。明显高于无碳样品，无碳样品在2000℃时的最大值为96.7%。结果还表明，其最大断裂韧性为7.1 MPa。在烧结温度为1900℃及以上时，含纳米炭黑的样品得到m1/2。讨论了样品的增韧机理。

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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;