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Thin-wall silicon carbide ceramic heat exchange tube, and preparation method and application thereof
The invention relates to a thin-wall silicon carbide ceramic heat exchange tube, and a preparation method and application thereof. The preparation method comprises the following steps that rod-shaped silicon carbide, phenolic resin, activated carbon, a dispersing agent and a solvent are subjected to ball milling and mixing to obtain slurry; the slurry is subjected to spray drying and sieving to obtain composite powder; the composite powder is subjected to pugging, aging, extrusion molding, drying and biscuiting to obtain a silicon carbide ceramic heat exchange tube biscuit; and the silicon carbide ceramic heat exchange tube biscuit is subjected to liquid-phase silicon infiltration, high-temperature silicon discharging and chemical vapor infiltration to obtain the thin-wall silicon carbide ceramic heat exchange tube, wherein the wall thickness of the thin-wall silicon carbide ceramic heat exchange tube ranges from 0.3 mm to 1.0 mm, the diameter-thickness ratio ranges from 2 to 4, and the length-diameter ratio ranges from 200 to 300. The large-length-diameter-ratio thin-wall silicon carbide ceramic heat exchange tube is manufactured through the method of combining liquid-phase silicon infiltration with CVI densification, the excellent mechanical property and air tightness are achieved, the bending strength is larger than 350 MPa, and the compression strength is larger than 20 MPa.
本发明是关于薄壁碳化硅陶瓷换热管及其制备方法和应用，所述的制备方法包括以下步骤：将棒状碳化硅、酚醛树脂、活性炭、分散剂和溶剂球磨混合，得到料浆；将所述的料浆喷雾干燥，并过筛，得到复合粉体；将所述的复合粉体练泥、陈腐、挤出成型，然后经干燥、素烧，得到碳化硅陶瓷换热管素坯；将所述的碳化硅陶瓷换热管素坯进行液相硅浸渗，经高温排硅后，再进行化学气相渗透，得到薄壁碳化硅陶瓷换热管，其壁厚为0.3‑1.0mm，径厚比为2‑4，长径比为200～300。本发明通过液相硅浸渗结合CVI致密化的方法制得了大长径比薄壁碳化硅陶瓷换热管，具有优异的力学性能和气密性，其中弯曲强度大于350MPa，耐压强度大于20MPa。
Thin-wall silicon carbide ceramic heat exchange tube, and preparation method and application thereof
The invention relates to a thin-wall silicon carbide ceramic heat exchange tube, and a preparation method and application thereof. The preparation method comprises the following steps that rod-shaped silicon carbide, phenolic resin, activated carbon, a dispersing agent and a solvent are subjected to ball milling and mixing to obtain slurry; the slurry is subjected to spray drying and sieving to obtain composite powder; the composite powder is subjected to pugging, aging, extrusion molding, drying and biscuiting to obtain a silicon carbide ceramic heat exchange tube biscuit; and the silicon carbide ceramic heat exchange tube biscuit is subjected to liquid-phase silicon infiltration, high-temperature silicon discharging and chemical vapor infiltration to obtain the thin-wall silicon carbide ceramic heat exchange tube, wherein the wall thickness of the thin-wall silicon carbide ceramic heat exchange tube ranges from 0.3 mm to 1.0 mm, the diameter-thickness ratio ranges from 2 to 4, and the length-diameter ratio ranges from 200 to 300. The large-length-diameter-ratio thin-wall silicon carbide ceramic heat exchange tube is manufactured through the method of combining liquid-phase silicon infiltration with CVI densification, the excellent mechanical property and air tightness are achieved, the bending strength is larger than 350 MPa, and the compression strength is larger than 20 MPa.
本发明是关于薄壁碳化硅陶瓷换热管及其制备方法和应用，所述的制备方法包括以下步骤：将棒状碳化硅、酚醛树脂、活性炭、分散剂和溶剂球磨混合，得到料浆；将所述的料浆喷雾干燥，并过筛，得到复合粉体；将所述的复合粉体练泥、陈腐、挤出成型，然后经干燥、素烧，得到碳化硅陶瓷换热管素坯；将所述的碳化硅陶瓷换热管素坯进行液相硅浸渗，经高温排硅后，再进行化学气相渗透，得到薄壁碳化硅陶瓷换热管，其壁厚为0.3‑1.0mm，径厚比为2‑4，长径比为200～300。本发明通过液相硅浸渗结合CVI致密化的方法制得了大长径比薄壁碳化硅陶瓷换热管，具有优异的力学性能和气密性，其中弯曲强度大于350MPa，耐压强度大于20MPa。
Thin-wall silicon carbide ceramic heat exchange tube, and preparation method and application thereof
薄壁碳化硅陶瓷换热管及其制备方法和应用
WANG CHUNPENG (author) / HU CHUANQI (author) / WANG HAORAN (author) / LIU HAILIN (author) / HUO YANLI (author) / JIA ZHIHUI (author) / YU DEHAI (author) / YANG TAISHENG (author) / LI HUI (author)
2021-10-29
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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