Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Low-temperature rapid degreasing and sintering method of alumina ceramic biscuit
The invention discloses a low-temperature rapid degreasing and sintering method of an aluminum oxide ceramic biscuit, and the method comprises the following steps: placing a crucible filled with the aluminum oxide ceramic biscuit in a tubular furnace, heating to 500-800 DEG C at a heating rate of 0.1-5 DEG C/min under a degreasing protective atmosphere condition with a flow rate of 0.1-1 L/min, and carrying out heat preservation for 0.5-4 hours for sufficient carbonization; carrying out cooling to 400-600 DEG C at the cooling rate of 0.1-5 DEG C/min, then introducing air, and keeping the temperature for 0.5-2 hours to remove carbon; after natural cooling, placing the aluminum oxide ceramic biscuit in a microwave sintering furnace; after the temperature is raised to the first sintering temperature at the rate of 5-20 DEG C/min, decreasing the first sintering temperature to the second sintering temperature at the rate of 5-20 DEG C/min, carrying out the heat preservation for 0.5-1 h, and completing sintering, wherein the second sintering temperature is 100-200 DEG C lower than the first sintering temperature. The method provided by the invention not only reduces the defects of blank cracks, layering, holes and the like caused by air degreasing, but also greatly reduces the sintering temperature of the aluminum oxide ceramic, shortens the sintering time, effectively inhibits grain growth, and improves the mechanical properties of the aluminum oxide ceramic.
本发明公开了一种氧化铝陶瓷素坯的低温快速脱脂烧结方法，其包括步骤：将装有氧化铝陶瓷素坯的坩埚放置于管式炉中，在0.1‑1L/min流量的脱脂保护性气氛条件下，以0.1‑5℃/min的升温速率升高至500‑800℃并保温0.5‑4h充分炭化；以0.1‑5℃/min的降温速率降至400‑600℃后换通空气并保温0.5‑2h成分除炭；待自然降温后，将所述氧化铝陶瓷素坯放置于微波烧结炉中，以5‑20℃/min的速率升温至第一次烧结温度后，再以5‑20℃/min速率将所述第一次烧结温度降至第二烧结温度并保温0.5‑1h完成烧结，所述第二烧结温度相对所述第一次烧结温度低100‑200℃。本发明提供的方法不仅减少了因空气脱脂导致胚体裂纹、分层、孔洞等缺陷，还大幅度降低了氧化铝陶瓷的烧结温度、缩短了烧结时间，有效抑制了晶粒长大、改善了其力学性能。
Low-temperature rapid degreasing and sintering method of alumina ceramic biscuit
The invention discloses a low-temperature rapid degreasing and sintering method of an aluminum oxide ceramic biscuit, and the method comprises the following steps: placing a crucible filled with the aluminum oxide ceramic biscuit in a tubular furnace, heating to 500-800 DEG C at a heating rate of 0.1-5 DEG C/min under a degreasing protective atmosphere condition with a flow rate of 0.1-1 L/min, and carrying out heat preservation for 0.5-4 hours for sufficient carbonization; carrying out cooling to 400-600 DEG C at the cooling rate of 0.1-5 DEG C/min, then introducing air, and keeping the temperature for 0.5-2 hours to remove carbon; after natural cooling, placing the aluminum oxide ceramic biscuit in a microwave sintering furnace; after the temperature is raised to the first sintering temperature at the rate of 5-20 DEG C/min, decreasing the first sintering temperature to the second sintering temperature at the rate of 5-20 DEG C/min, carrying out the heat preservation for 0.5-1 h, and completing sintering, wherein the second sintering temperature is 100-200 DEG C lower than the first sintering temperature. The method provided by the invention not only reduces the defects of blank cracks, layering, holes and the like caused by air degreasing, but also greatly reduces the sintering temperature of the aluminum oxide ceramic, shortens the sintering time, effectively inhibits grain growth, and improves the mechanical properties of the aluminum oxide ceramic.
本发明公开了一种氧化铝陶瓷素坯的低温快速脱脂烧结方法，其包括步骤：将装有氧化铝陶瓷素坯的坩埚放置于管式炉中，在0.1‑1L/min流量的脱脂保护性气氛条件下，以0.1‑5℃/min的升温速率升高至500‑800℃并保温0.5‑4h充分炭化；以0.1‑5℃/min的降温速率降至400‑600℃后换通空气并保温0.5‑2h成分除炭；待自然降温后，将所述氧化铝陶瓷素坯放置于微波烧结炉中，以5‑20℃/min的速率升温至第一次烧结温度后，再以5‑20℃/min速率将所述第一次烧结温度降至第二烧结温度并保温0.5‑1h完成烧结，所述第二烧结温度相对所述第一次烧结温度低100‑200℃。本发明提供的方法不仅减少了因空气脱脂导致胚体裂纹、分层、孔洞等缺陷，还大幅度降低了氧化铝陶瓷的烧结温度、缩短了烧结时间，有效抑制了晶粒长大、改善了其力学性能。
Low-temperature rapid degreasing and sintering method of alumina ceramic biscuit
一种氧化铝陶瓷素坯的低温快速脱脂烧结方法
KONG LINGBING (Autor:in) / ZHANG LING (Autor:in) / HUANG JINGYIN (Autor:in) / HE YU (Autor:in) / LIU KAIGE (Autor:in) / XIANG BINGXI (Autor:in) / ZHAI JIANPANG (Autor:in)
31.12.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
/
B33Y
ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
,
Additive (generative) Fertigung, d. h. die Herstellung von dreidimensionalen [3D] Bauteilen durch additive Abscheidung, additive Agglomeration oder additive Schichtung, z. B. durch 3D- Drucken, Stereolithografie oder selektives Lasersintern
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