CN106187111A - 一种复合陶瓷及其制备方法 - Google Patents

一种复合陶瓷及其制备方法 Download PDF

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CN106187111A
CN106187111A CN201610511631.9A CN201610511631A CN106187111A CN 106187111 A CN106187111 A CN 106187111A CN 201610511631 A CN201610511631 A CN 201610511631A CN 106187111 A CN106187111 A CN 106187111A
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王珉
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China University of Petroleum East China
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Abstract

本发明涉及一种复合陶瓷，由以下组分按照重量份数制备而成：α‑Al2O3 21‑45份，TiN15‑30份，Zr2O 3‑6份，Ni 3‑5份，Si 15‑20份，NH4Cl 1.5‑2份。本发明制备方法中的烧结过程，严格控制温度升降和压力升降，首先在微正压的环境下使原料中的Si粉与脱水脱氢的氮气生成β相氮化硅，之后再控制温度和压力进行烧结，得到本发明的高性能复合陶瓷；本发明的复合陶瓷，相对密度可达到99.4％，断裂韧性达到7.8MPa·m1/2～8.7MPa·m1/2，维氏硬度达到20.5‑21.8GPa，热导率为132～143W/(m·K)，抗弯强度达690‑710MPa。

Description

一种复合陶瓷及其制备方法
技术领域
本发明属材料科学技术领域，特别涉及一种具备高硬度、高热导率、致密性好的复合陶瓷及其制备方法。
背景技术
复合陶瓷材料的硬度高、耐磨性好、热硬性强、化学稳定性高。用复合陶瓷材料制造的刀具可以对不锈钢、高温合金等难加工材料进行高速高效切削，可以有效避免切削高温时刀具失效的问题，其高温切削性能优于硬质合金刀具和普陶瓷刀具材料，近年来随着航空航天工业、石油工业的发展，不锈钢、高温合金等难加工材料的加工问题越来越受到重视，而复合陶瓷刀具材料特别适合于加工各种难加工材料。
发明内容
本发明的目的是提供一种高硬度、高热导率、致密性好、耐磨性好、化学性能稳定的复合陶瓷及其制备方法。
本发明的技术方案如下：
一种复合陶瓷，由以下组分按照重量份数制备而成：
α-Al2O3 21-45份，TiN15-30份，Zr2O 3-6份，Ni 3-5份，Si 15-20份，NH4Cl 1.5-2份。
制备方法具体步骤如下：
(1)将各种原料干燥后按量混合均匀，过400-500目筛；
(2)常温下，将过筛后的原料在球磨机中球磨3-4小时；
(3)将球磨后的原料装入高强石墨模具中，炉内抽真空后通入脱水脱氢的氮气，压力控制在0.1-0.15MPa，以25℃/min的速度升温至1200℃，保温15小时；之后将逐渐加压至20MPa，加压速度为1MPa/min，加压过程中逐步升温，升温速度为50℃/min，当温度达到1600℃、压力20MPa后，保温保压1小时，之后，在保压的情况下，逐渐降温至室温。
本发明的有益效果：
本发明制备方法中的烧结过程，严格控制温度升降和压力升降，首先在微正压的环境下使原料中的Si粉与脱水脱氢的氮气生成β相氮化硅，之后再控制温度和压力进行烧结，得到本发明的高性能复合陶瓷；本发明的复合陶瓷，相对密度可达到99.4％，断裂韧性达到7.8MPa·m1/2～8.7MPa·m1/2，维氏硬度达到20.5-21.8GPa，热导率为132～143W/(m·K)，抗弯强度达690-710MPa。
具体实施方式
以下实施例用于说明本发明，但不用来限制本发明的范围。在不背离本发明精神和实质的情况下，对本发明方法、步骤或条件所作的修改或替换，均属于本发明的保护范围。
若未特别指明，实施例中所用的技术手段为本领域技术人员所熟知的常规手段。
实施例1
一种复合陶瓷，由以下组分按照重量份数制备而成：
α-Al2O3 38份，TiN 26份，Zr2O 5.3份，Ni 4.7份，Si 16.8份，NH4Cl 1.8份。
制备方法具体步骤如下：
(1)将各种原料干燥后按量混合均匀，过500目筛；
(2)常温下，将过筛后的原料在球磨机中球磨4小时；
(3)将球磨后的原料装入高强石墨模具中，炉内抽真空后通入脱水脱氢的氮气，压力控制在0.1-0.15MPa，以25℃/min的速度升温至1200℃，保温15小时；之后将逐渐加压至20MPa，加压速度为1MPa/min，加压过程中逐步升温，升温速度为50℃/min，当温度达到1600℃、压力20MPa后，保温保压1小时，之后，在保压的情况下，逐渐降温至室温。
上述原料和方法制备的复合陶瓷性能优越，相对密度可达到99.4％，断裂韧性达到8.7MPa·m1/2，维氏硬度达到21.8GPa，热导率为143W/(m·K)，抗弯强度达710MPa。
上述实施方案为本发明最佳的实施方案，但本发明的实施方案并不受上述实施方案的限制，其他的任何不违背本发明原理的条件下，可以通过改变参数的形式所产生的实施例，都包含于本发明的保护范围之内。

Claims (3)

1.一种复合陶瓷，其特征在于，由以下组分按照重量份数制备而成：
α-Al2O3 21-45份，TiN15-30份，Zr2O 3-6份，Ni 3-5份，Si 15-20份，NH4Cl 1.5-2份。
2.根据权利要求1所述的复合陶瓷，其特征在于，由以下组分按照重量份数制备而成：
α-Al2O3 38份，TiN 26份，Zr2O 5.3份，Ni 4.7份，Si 16.8份，NH4Cl 1.8份。
3.一种根据权利要求1或2所述的复合陶瓷的制备方法，其特征在于，具体步骤如下：
(1)将各种原料干燥后按量混合均匀，过400-500目筛；
(2)常温下，将过筛后的原料在球磨机中球磨3-4小时；
(3)将球磨后的原料装入高强石墨模具中，炉内抽真空后通入脱水脱氢的氮气，压力控制在0.1-0.15MPa，以25℃/min的速度升温至1200℃，保温15小时；之后将逐渐加压至20MPa，加压速度为1MPa/min，加压过程中逐步升温，升温速度为50℃/min，当温度达到1600℃、压力20MPa后，保温保压1小时，之后，在保压的情况下，逐渐降温至室温。
CN201610511631.9A 2016-07-01 2016-07-01 一种复合陶瓷及其制备方法 Pending CN106187111A (zh)

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CN112645714A (zh) * 2020-12-28 2021-04-13 中材高新氮化物陶瓷有限公司 一种氮化硅陶瓷脱水元件及其制备方法和应用

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112645714A (zh) * 2020-12-28 2021-04-13 中材高新氮化物陶瓷有限公司 一种氮化硅陶瓷脱水元件及其制备方法和应用

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Application publication date: 20161207