CN1915810A - 常压烧结碳化硅制品的快速烧结法 - Google Patents

常压烧结碳化硅制品的快速烧结法 Download PDF

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CN1915810A
CN1915810A CNA2006101070026A CN200610107002A CN1915810A CN 1915810 A CN1915810 A CN 1915810A CN A2006101070026 A CNA2006101070026 A CN A2006101070026A CN 200610107002 A CN200610107002 A CN 200610107002A CN 1915810 A CN1915810 A CN 1915810A
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sintering
silicon carbide
normal pressure
products
temperature
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CN100402423C (zh
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蔡鸣
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Shanghai ASUS fine ceramic Limited by Share Ltd
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HUASHUO PRECISION CERAMIC CO Ltd ZHENGZHOU
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract

本发明公开了一种常压烧结碳化硅制品的快速烧结法，A.在900℃以前，无论产品形状大小为何，均可按12～15℃/分钟的速度升温；B.900℃以后，可按15～18℃/分钟的速度快速升温至1600℃，并保温0～5分钟；C.而后再按8～10℃/分的速度升温至2300℃，保温25～30分钟，即完成烧结，得到产品密度平均在3.10～3.15g/cm3之间。按照本发明烧结方法，每炉的碳化硅制品烧结时间在4－6小时即可完成，同时保证产品质量，既不过烧、不欠烧，产品密度平均在3.10－3.15g/cm3之间。生坯成型碳化硅制品中的成型助剂在800℃前全部分解挥发，其残余量为氮、碳，大大提高了烧成成品质量，达到了节能高效常压烧结碳化硅制品的目的。

Description

常压烧结碳化硅制品的快速烧结法
技术领域
本发明涉及碳化硅制品的烧结方法，尤其是涉及常压烧结碳化硅制品的快速烧结法。
背景技术
常压烧结碳化硅以其优异的高强度，高硬度，耐高温，耐磨损，耐腐蚀性能被广泛地应用在现代工业生产各个领域之中。相关理论研究表明，常压烧结Sic的烧成，在合乎质量要求的粉料及成型技术的保证下，其烧结技术表现为(1)、必须达到常压烧结Sic的烧成温度2200-2500℃；(2)、必须设计合理的烧结曲线；(3)必须在保护气氛下进行烧结。但在常压烧结Sic烧结理论及烧结生产技术资料中，对常压烧结Sic最终烧成时间均无详细及统一标准。如美国Carborundum公司介绍从4至100个小时。而国内相关研究资料则表明一般需12-18小时。在实际生产中，最终烧成时间的长短对产品的成本控制、生产设备效率的提高和产品质量的控制起着至关重要的作用。如何在最短的时间内，烧出合乎质量标准的产品，是大规模、工业化生产常压烧结Sic产品不可绕过的门槛。
发明内容
本发明目的在于提供一种烧结成本低、生产效率高的常压烧结碳化硅制品的快速烧结法。
为实现上述目的，本发明可采取下述技术方案：
本发明所述的常压烧结碳化硅制品的快速烧结法，
A、在900℃以前，无论产品形状大小为何，均可按12～15℃/分钟的速度升温；
B、900℃以后，可按15～18℃/分钟的速度快速升温至1600℃，并保温0～5分钟；
C、而后再按8～10℃/分的速度升温至2300℃，保温25～30分钟，即完成烧结，得到产品密度平均在3.10～3.15g/cm3之间。
按照本发明烧结方法，每炉的碳化硅制品烧结时间在4-6小时即可完成，同时保证产品质量，既不过烧、不欠烧，产品密度平均在3.10-3.15g/cm3之间。生坯成型碳化硅制品中的成型助剂在800℃前全部分解挥发，其残余量为氮、碳，大大提高了烧成成品质量；科学的升温速度，使生坯成型碳化硅制品中的成型助剂、烧结助剂、脱模助剂等其它高分子材料在烧结过程中，各自以不同的温度分解、挥发，既避免了由于升温过快造成毛坯的损害，如裂缝等，又缩短了烧成时间，大大降低了烧制过程中的能源消耗量，达到了节能高效常压烧结碳化硅制品的目的。
具体实施方式
本发明所述的常压烧结碳化硅制品的快速烧结法，A、对于高度在10mm以上，内径10-70mm，密度在1.87g/cm3-1.89g/cm3的生坯成型碳化硅制品，在温度低于800℃以前采用8℃-10℃/分钟的升温速度；
B、对于高度在10mm以下，内径在80mm-200mm，密度在1.87g/cm3-1.89g/cm3的生坯成型碳化硅制品，在温度低于800℃以前采用5℃/分钟的升温速度控制；
C、对于单件用粉量在1kg-20kg之间，密度在1.87g/cm3-1.89g/cm3的生坯成型碳化硅制品，在温度低于800℃以前采用5℃-6℃/分钟的升温速度；
D、在上述生坯成型碳化硅制品烧结过程中，当升温至800℃时，升温速度提高为9℃-10℃/分钟，在炉温升至1500℃时，保温18-20分钟，而后快速升至2300℃，保温25-30分钟，烧结完成，得到产品密度平均在3.10-3.15g/cm3之间。

Claims (1)

1、一种常压烧结碳化硅制品的快速烧结法，其特征在于：
A、在900℃以前，无论产品形状大小为何，均可按12～15℃/分钟的速度升温；
B、900℃以后，可按15～18℃/分钟的速度快速升温至1600℃，并保温0～5分钟；
C、而后再按8～10℃/分的速度升温至2300℃，保温25～30分钟，即完成烧结，得到产品密度平均在3.10～3.15g/cm3之间。
CNB2006101070026A 2006-09-07 2006-09-07 常压烧结碳化硅制品的快速烧结法 Active CN100402423C (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105294116A (zh) * 2015-07-07 2016-02-03 洛阳名力科技开发有限公司 碳化硅陶瓷液相烧结防粘方法

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* Cited by examiner, † Cited by third party
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JPS57175718A (en) * 1981-04-20 1982-10-28 Hitachi Ltd Preparation of silicon carbide fine powder
CN1021207C (zh) * 1990-11-17 1993-06-16 国营苏北砂轮厂 碳化硅砂轮的制造方法
CN1264687A (zh) * 2000-03-15 2000-08-30 武汉工业大学 纯碳粉水基分散一步法制造反应烧结碳化硅陶瓷材料的方法
CN1807356A (zh) * 2006-01-28 2006-07-26 黄黎敏 纳米碳化硅助剂烧结高纯碳化硅蜂窝陶瓷体的制造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105294116A (zh) * 2015-07-07 2016-02-03 洛阳名力科技开发有限公司 碳化硅陶瓷液相烧结防粘方法

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