Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
SiC/HfB2-SiC-La2O3/SiC ultra-high temperature oxidation resistant composite coating on graphite matrix
The invention relates to the field of ultra-high temperature oxidation protective coatings, in particular to a SiC/HfB2-SiC-La2O3/SiC ultra-high temperature oxidation resistant composite coating on agraphite matrix and a preparation method of the SiC/HfB2-SiC-La2O3/SiC ultra-high temperature oxidation resistant composite coating. The design and preparation of the coating comprise the following steps: preparing a SiC bottom layer with the thickness of 100-150 [mu]m by a powder embedding method, preparing an HfB2-SiC-La2O3 intermediate layer with the thickness of 60-70 [mu]m by a slurry brushing method, and preparing a SiC outer layer with the thickness of 70-80 [mu]m by a subsequent embedding method, wherein the SiC bottom layer can relieve mismatching of thermal expansion coefficients between the HfB2-SiC-La2O3 middle layer and the graphite substrate, the HfB2-SiC-La2O3 middle layer provides good ultra-high temperature oxidation resistance and structural stability for the graphite substrate and the SiC outer layer can effectively heal surface defects generated in the oxidation process. According to the method, the material utilization rate is high, the preparation process is simple, convenient and feasible, the preparation period is short, the preparation cost of the coating can be effectively reduced, and the component uniformity and controllability of the prepared coating are improved. The coating prepared by the method has the ultra-high temperature oxidation resistance at 1700 DEG C for 1800 seconds.
本发明涉及超高温氧化防护涂层领域，具体为一种石墨基体上SiC/HfB2‑SiC‑La2O3/SiC抗超高温氧化复合涂层及其制备方法。涂层的设计及制备包括：粉末包埋法制备厚度为100～150μm的SiC底层，料浆涂刷法制备厚度为60～70μm的HfB2‑SiC‑La2O3中间层和后续包埋法制备厚度为70～80μm的SiC外层。其中，SiC底层可缓解HfB2‑SiC‑La2O3中间层与石墨基体间的热膨胀系数不匹配，HfB2‑SiC‑La2O3中间层为石墨基体提供良好的抗超高温氧化性能和结构稳定性能。SiC外层可有效愈合氧化过程产生的表面缺陷。本发明方法物料利用率高，制备工艺简便易行，制备周期短，可有效降低涂层制备成本并提高制备的涂层成分均匀性和可控性。本发明制备的涂层具有1700℃、1800s的抗超高温氧化能力。
SiC/HfB2-SiC-La2O3/SiC ultra-high temperature oxidation resistant composite coating on graphite matrix
The invention relates to the field of ultra-high temperature oxidation protective coatings, in particular to a SiC/HfB2-SiC-La2O3/SiC ultra-high temperature oxidation resistant composite coating on agraphite matrix and a preparation method of the SiC/HfB2-SiC-La2O3/SiC ultra-high temperature oxidation resistant composite coating. The design and preparation of the coating comprise the following steps: preparing a SiC bottom layer with the thickness of 100-150 [mu]m by a powder embedding method, preparing an HfB2-SiC-La2O3 intermediate layer with the thickness of 60-70 [mu]m by a slurry brushing method, and preparing a SiC outer layer with the thickness of 70-80 [mu]m by a subsequent embedding method, wherein the SiC bottom layer can relieve mismatching of thermal expansion coefficients between the HfB2-SiC-La2O3 middle layer and the graphite substrate, the HfB2-SiC-La2O3 middle layer provides good ultra-high temperature oxidation resistance and structural stability for the graphite substrate and the SiC outer layer can effectively heal surface defects generated in the oxidation process. According to the method, the material utilization rate is high, the preparation process is simple, convenient and feasible, the preparation period is short, the preparation cost of the coating can be effectively reduced, and the component uniformity and controllability of the prepared coating are improved. The coating prepared by the method has the ultra-high temperature oxidation resistance at 1700 DEG C for 1800 seconds.
本发明涉及超高温氧化防护涂层领域，具体为一种石墨基体上SiC/HfB2‑SiC‑La2O3/SiC抗超高温氧化复合涂层及其制备方法。涂层的设计及制备包括：粉末包埋法制备厚度为100～150μm的SiC底层，料浆涂刷法制备厚度为60～70μm的HfB2‑SiC‑La2O3中间层和后续包埋法制备厚度为70～80μm的SiC外层。其中，SiC底层可缓解HfB2‑SiC‑La2O3中间层与石墨基体间的热膨胀系数不匹配，HfB2‑SiC‑La2O3中间层为石墨基体提供良好的抗超高温氧化性能和结构稳定性能。SiC外层可有效愈合氧化过程产生的表面缺陷。本发明方法物料利用率高，制备工艺简便易行，制备周期短，可有效降低涂层制备成本并提高制备的涂层成分均匀性和可控性。本发明制备的涂层具有1700℃、1800s的抗超高温氧化能力。
SiC/HfB2-SiC-La2O3/SiC ultra-high temperature oxidation resistant composite coating on graphite matrix
一种石墨基体上SiC／HfB2-SiC-La2O3／SiC抗超高温氧化复合涂层
QIAN YUHAI (Autor:in) / REN YAN (Autor:in) / LI MEISHUAN (Autor:in) / XU JINGJUN (Autor:in) / ZUO JUN (Autor:in)
20.11.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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