Xenotime-type high-entropy (Dy <sub>1/7</sub>Ho <sub>1/7</sub>Er <sub>1/7</sub>Tm <sub>1/7</sub>Yb <sub>1/7</sub>Lu <sub>1/7</sub>Y <sub>1/7</sub>)PO <sub>4</sub>: A promising thermal/environmental barrier coating material for SiC <sub>f</sub>/SiC ceramic matrix composites
نویسندگان
چکیده
Rare-earth phosphates (REPO4) are regarded as one of the promising thermal/environmental barrier coating (T/EBC) materials for SiCf/SiC ceramic matrix composites (SiC-CMCs) owing to their excellent resistance water vapor and CaO–MgO–Al2O3–SiO2 (CMAS). Nevertheless, a relatively high thermal conductivity (?) REPO4 becomes bottleneck practical applications. In this work, novel xenotime-type high-entropy (Dy1/7Ho1/7Er1/7Tm1/7Yb1/7Lu1/7Y1/7)PO4 (HE (7RE1/7)PO4) has been designed synthesized first time solve issue. HE (7RE1/7)PO4 with homogeneous rare-earth element distribution exhibits stability up 1750 ? good chemical compatibility SiO2 1400 ?. addition, expansion coefficient (TEC) (5.96×10?6 ??1 from room temperature (RT) 900 ?) is close that SiC-CMCs. What more, conductivities (from 4.38 W·m?1·K?1 at 100 ? 2.25 1300 significantly decreased compared those single-component minimum value ranging 9.90 4.76 W·m?1·K?1. These results suggest potential be applied T/EBC SiC-CMCs in future.
منابع مشابه
Comparison of Cyclic Hysteresis Behavior between Cross-Ply C/SiC and SiC/SiC Ceramic-Matrix Composites
In this paper, the comparison of cyclic hysteresis behavior between cross-ply C/SiC and SiC/SiC ceramic-matrix composites (CMCs) has been investigated. The interface slip between fibers and the matrix existed in the matrix cracking mode 3 and mode 5, in which matrix cracking and interface debonding occurred in the 0° plies are considered as the major reason for hysteresis loops of cross-ply CMC...
متن کاملMeasurement of elastic moduli of porous SiC/SiC ceramic matrix composites using ultrasonics
Forced Chemical Vapor Infiltration (FCVI) method was used in fabricating the Nicalon TM!Silicon Carbide composites. Both through-thickness and In-plane (fiber fabric plane) moduli were determined using ultrasonic techniques. The through-thickness moduli were found to be much less than the inplane moduli. Both in-plane and through-thickness moduli were significantly decreased with an increased p...
متن کاملHigh Thermal Conductivity SiC/SiC Composites for Fusion Applications
SiC-SiC composites offer excellent potential for fusion energy as well as numerous commercial applications. High manufacturing cost and very low through-the-thickness (transverse) thermal conductivity (below 15 W/mK) hinders wider applications of SiC/SiC composites. To overcome these obstacles, a low-cost, Chemical Vapor Reaction (CVR) process was developed to fabricate crystalline, high purity...
متن کاملApplication of Electrophoretic Deposition for Interfacial Control of High-Performance SiC Fiber-Reinforced SiC Matrix (SiCf/SiC) Composites
This chapter reviews the novel fabrication process of continuous SiCf /SiC composites based on electrophoretic deposition (EPD). EPD process is very effective for achieving relatively homogeneous carbon coating with the thickness of several tens to hundreds nanometers on SiC fibers. Carbon interface with the thickness of at least 100 nm formed by EPD acts effectively for inducing interfacial de...
متن کاملCasting of SiC Reinforced Metal Matrix Composites
Composites based on two aluminium alloys (A536 and 6061) reinforced with 10% or 20% volume fraction of SiC particles were produced by gravity casting and a novel two-step mixing method was applied successfully to improve the wettability and distribution of the particles. The SiC particles were observed to be located predominantly in the interdendrit ic regions, and a thermal lag model is propos...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Advanced Ceramics
سال: 2023
ISSN: ['2227-8508', '2226-4108']
DOI: https://doi.org/10.26599/jac.2023.9220736