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Preparation method of high-compactness SiCf/SiC cladding composite pipe
The invention discloses a preparation method of a high-compactness SiCf/SiC cladding composite pipe, which comprises the following steps: S1, preparing a low-density SiCf/SiC preform: conducting weaving or winding to form a SiC fiber pipe, and carrying out PyC interface layer deposition and short-time SiC matrix deposition on the fiber surface by a CVI technique to obtain the low-density SiCf/SiCpreform; S2, preparing a SiCf/SiC blank: dispersing nano SiC sintered powder and an organic additive into an organic dispersant to prepare NITE-SiC slurry, diffusing the NITE-SiC slurry into pores ofthe low-density SiCf/SiC preform through infiltration, and conducting drying to obtain the SiCf/SiC blank; S3, conducting heat treatment: carrying out degumming heat treatment on the SiCf/SiC green body under the protection of an inert gas atmosphere; and S4, conducting hot isostatic pressing sintering: subjecting the blank obtained after heat treatment to gas-phase pressure sintering in the inertgas atmosphere, so as to obtain the high-compactness SiCf/SiC cladding composite pipe. By means of the preparation method, the SiCf/SiC cladding composite material with high density can be obtained,and the problem that SiCf/SiC pipe fittings are difficult to form is solved.
本发明公开了一种高致密化SiCf/SiC包壳复合管材的制备方法，包括以下步骤：S1：制备低密度SiCf/SiC预制体：以编织或缠绕成SiC纤维管，然后通过CVI工艺在纤维表面进行PyC界面层沉积及短时间SiC基体沉积，获得低密度SiCf/SiC预制体；S2：制备SiCf/SiC坯体：将纳米SiC烧结粉体和有机添加剂分散在有机分散剂中制成NITE‑SiC浆料，通过浸渗使NITE‑SiC浆料扩散进低密度SiCf/SiC预制体的孔隙之中，干燥后获得SiCf/SiC坯体；S3：热处理：将SiCf/SiC坯体在惰性气体气氛保护下进行脱胶热处理；S4：热等静压烧结：将热处理后的坯体在惰性气体气氛下，气相加压烧结，获得高致密化SiCf/SiC包壳复合管材。通过该制备方法不仅能够获得致密度高的SiCf/SiC包壳复合材料，且解决了SiCf/SiC管件成型难的问题。
Preparation method of high-compactness SiCf/SiC cladding composite pipe
The invention discloses a preparation method of a high-compactness SiCf/SiC cladding composite pipe, which comprises the following steps: S1, preparing a low-density SiCf/SiC preform: conducting weaving or winding to form a SiC fiber pipe, and carrying out PyC interface layer deposition and short-time SiC matrix deposition on the fiber surface by a CVI technique to obtain the low-density SiCf/SiCpreform; S2, preparing a SiCf/SiC blank: dispersing nano SiC sintered powder and an organic additive into an organic dispersant to prepare NITE-SiC slurry, diffusing the NITE-SiC slurry into pores ofthe low-density SiCf/SiC preform through infiltration, and conducting drying to obtain the SiCf/SiC blank; S3, conducting heat treatment: carrying out degumming heat treatment on the SiCf/SiC green body under the protection of an inert gas atmosphere; and S4, conducting hot isostatic pressing sintering: subjecting the blank obtained after heat treatment to gas-phase pressure sintering in the inertgas atmosphere, so as to obtain the high-compactness SiCf/SiC cladding composite pipe. By means of the preparation method, the SiCf/SiC cladding composite material with high density can be obtained,and the problem that SiCf/SiC pipe fittings are difficult to form is solved.
本发明公开了一种高致密化SiCf/SiC包壳复合管材的制备方法，包括以下步骤：S1：制备低密度SiCf/SiC预制体：以编织或缠绕成SiC纤维管，然后通过CVI工艺在纤维表面进行PyC界面层沉积及短时间SiC基体沉积，获得低密度SiCf/SiC预制体；S2：制备SiCf/SiC坯体：将纳米SiC烧结粉体和有机添加剂分散在有机分散剂中制成NITE‑SiC浆料，通过浸渗使NITE‑SiC浆料扩散进低密度SiCf/SiC预制体的孔隙之中，干燥后获得SiCf/SiC坯体；S3：热处理：将SiCf/SiC坯体在惰性气体气氛保护下进行脱胶热处理；S4：热等静压烧结：将热处理后的坯体在惰性气体气氛下，气相加压烧结，获得高致密化SiCf/SiC包壳复合管材。通过该制备方法不仅能够获得致密度高的SiCf/SiC包壳复合材料，且解决了SiCf/SiC管件成型难的问题。
Preparation method of high-compactness SiCf/SiC cladding composite pipe
一种高致密化SiCf/SiC包壳复合管材的制备方法
LI MING (author) / FU DAOGUI (author) / HE ZONGBEI (author) / ZHANG RUIQIAN (author) / HE KUN (author) / HONG XIAOFENG (author) / QIU SHAOYU (author)
2021-02-19
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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