CN109574686A - 一种结合剂、立方氮化硼聚晶烧结体及其制备方法 - Google Patents

一种结合剂、立方氮化硼聚晶烧结体及其制备方法 Download PDF

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CN109574686A
CN109574686A CN201710904553.3A CN201710904553A CN109574686A CN 109574686 A CN109574686 A CN 109574686A CN 201710904553 A CN201710904553 A CN 201710904553A CN 109574686 A CN109574686 A CN 109574686A
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boron nitride
cubic boron
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titanium
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王丽娜
周青
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Henan Haina New Material Co Ltd
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Abstract

本发明提供一种结合剂、立方氮化硼聚晶烧结体及其制备方法，该结合剂包括金属铝、二氧化硅、金属铬、硼化钛、二硼化钛、硅化钛和氮化钛，烧结过程中，金属铝可以和二氧化硅反应形成氧化铝和硅单质，金属铬可以在硅化钛的促进下和立方氮化硼形成氮化铬或硼化铬，因此，该结合剂可以有效克服金属结合剂和陶瓷结合剂的缺点，用于制备立方氮化硼聚晶烧结体过程中，可以有效提高聚晶立方氮化硼的硬度、韧性及导热性能，具有广阔的适应性。

Description

一种结合剂、立方氮化硼聚晶烧结体及其制备方法
技术领域
本发明属于超硬材料领域，具体地，涉及一种结合剂、立方氮化硼聚晶烧结体及其制备方法。
背景技术
聚晶立方氮化硼是立方氮化硼颗粒和一定比例的结合剂在高温高压下烧结而成的。结合剂在合成聚晶立方氮化硼的过程中起着重要的作用，加入适量的结合剂可以降低烧结温度和压力，并能改善烧结体的性能。聚晶立方氮化硼结合剂主要有金属结合剂和陶瓷结合剂。
其中，金属结合剂通常在700～800℃软化，会导致聚晶立方氮化硼的耐磨性下降。陶瓷结合剂具有较高的耐高温磨损和较强的抗化学磨损优点，但陶瓷在高温时导热性差，使切削温度集中在被加工材料上，使之软化。因此，开发一种结合剂克服金属结合剂的软化问题和陶瓷结合剂的导热问题具有重要的现实意义。
发明内容
有鉴于此，本发明提供一种一种结合剂、立方氮化硼聚晶烧结体及其制备方法，以解决上述问题。
具体地，本发明采取如下技术方案：
一种结合剂，它包括以下质量份的组分：金属铝(Al)7～12份、二氧化硅(SiO2)27～43份、金属铬(Cr)3～5份、硼化钛(TiB)2～7份、二硼化钛(TiB2)30～40份、硅化钛(Si2Ti)8～12份和氮化钛(TiN)5～10份。
基于上述结合剂，它的平均粒径为200～300nm。
基于上述结合剂，它还包括石墨烯微粉0.5～2.5份，所述石墨烯微粉的粒径为32～54nm。
一种立方氮化硼聚晶烧结体，它包括以下质量份的原料：立方氮化硼72～85份和上述结合剂15～28份。
基于上述，所述立方氮化硼的平均粒径为3～10μm。
一种上述立方氮化硼聚晶烧结体的制备方法，其包括以下步骤：
将所述结合剂、所述立方氮化硼混合均匀，制得混合物料；
在60～100MPa条件下，将所述混合物料压制成坯，得到坯体；
将所述坯体在6.0～7.5GPa、1200～1500℃条件下烧结5～10min，取出，得到所述立方氮化硼聚晶烧结体。
与现有技术相比，本发明具有突出的实质性特点和显著进步。具体的说，本发明提供一种结合剂，在烧结过程中，金属铝起到金属结合剂的作用，烧结温度逐渐上升，金属铝和二氧化硅发生反应形成氧化铝和硅单质，氧化铝和硅单质的熔点都远高于金属铝，可以有效避免金属结合剂的软点效应，而金属铬和未反应的金属铝则可以在结合剂中的硅化钛促进作用下和立方氮化硼反应形成氮化铝、硼化铝、氮化铬或硼化铬；且氧化铝和氮化铝、硼化铝、氮化铬或硼化铬与该结合剂中的陶瓷组分二硼化钛、硼化钛、硅化钛和氮化钛共同作用，使聚晶立方氮化硼具有良好的硬度和韧性，同时，硅单质和石墨烯微粉还可以有效提高聚晶立方氮化硼的导热性。另外，本发明还提供一种立方氮化硼聚晶烧结体及其制备方法，采用上述结合剂和立方氮化硼混合制备立方氮化硼聚晶烧结体，经检测，所述立方氮化硼聚晶烧结体的硬度为3110～3345Hv，冲击次数为40～45，导热系数为113～133W/(m·K)。
具体实施方式
下面通过具体实施方式，对本发明的技术方案做进一步的详细描述。
实施例1
本实施例提供一种结合剂，它的平均粒径为300nm，由以下质量份的组分构成：金属铝7份、二氧化硅32份、金属铬3份、二硼化钛32份、硼化钛2份、硅化钛8份和氮化钛5份。
本实施例提供一种立方氮化硼聚晶烧结体，它包括以下质量份的原料：立方氮化硼72份和所述结合剂28份，其中，所述立方氮化硼的平均粒径为10μm。
本实施例提供该立方氮化硼聚晶烧结体的制备方法，其包括以下步骤：
将所述结合剂、所述立方氮化硼混合均匀，制得混合物料；
在60MPa条件下，将所述混合物料压制成坯，得到坯体；
将所述坯体在6.1GPa、1200℃条件下烧结10min，取出，得到所述立方氮化硼聚晶烧结体。
实施例2
本实施例提供一种结合剂，它的平均粒径为267nm，由以下质量份的组分构成：金属铝12份、二氧化硅43份、二硼化钛40份、硼化钛7份、硅化钛12份、金属铬5份、氮化钛7份和石墨烯微粉1份；其中，所述石墨烯微粉的粒径为32～54nm。
本实施例提供一种立方氮化硼聚晶烧结体，它包括以下质量份的原料：立方氮化硼85份和所述结合剂15份；其中，所述立方氮化硼的平均粒径为7μm。
本实施例提供该立方氮化硼聚晶烧结体的制备方法，其包括以下步骤：
将所述结合剂、所述立方氮化硼混合均匀，制得混合物料；
在80MPa条件下，将所述混合物料压制成坯，得到坯体；
将所述坯体在7.0GPa、1400℃条件下烧结7min，取出，得到所述立方氮化硼聚晶烧结体。
实施例3
本实施例提供一种结合剂，它的平均粒径为200nm，由以下质量份的组分构成：金属铝8份、二氧化硅40份、金属铬4份、二硼化钛35份、硼化钛3份、硅化钛11份、氮化钛10份和石墨烯微粉2.5份；其中，所述石墨烯微粉的粒径为32～54nm。
本实施例提供一种立方氮化硼聚晶烧结体，它包括以下质量份的原料：立方氮化硼82份和所述结合剂18份；其中，所述立方氮化硼的平均粒径为3μm。
本实施例提供该立方氮化硼聚晶烧结体的制备方法，其包括以下步骤：
将所述结合剂、所述立方氮化硼混合均匀，制得混合物料；
在100MPa条件下，将所述混合物料压制成坯，得到坯体；
将所述坯体在6.5GPa、1500℃条件下烧结5min，取出，得到所述立方氮化硼聚晶烧结体。
实施例4
本实施例提供一种结合剂，它的平均粒径为224nm，由以下质量份的组分构成：金属铝10份、二氧化硅30份、二硼化钛35份、硼化钛5份、金属铬4份、硅化钛9份、氮化钛7份和石墨烯微粉0.5份；其中，所述石墨烯微粉的粒径为32～54nm。
本实施例提供一种立方氮化硼聚晶烧结体，它包括以下质量份的原料：立方氮化硼74份和所述结合剂26份；其中，所述立方氮化硼的平均粒径为5μm。
本实施例提供该立方氮化硼聚晶烧结体的制备方法，其包括以下步骤：
将所述结合剂、所述立方氮化硼混合均匀，制得混合物料；
在65MPa条件下，将所述混合物料压制成坯，得到坯体；
将所述坯体在6.7GPa、1500℃条件下烧结7min，取出，得到所述立方氮化硼聚晶烧结体。
实施例5
本实施例提供一种结合剂，它的平均粒径为256nm，由以下质量份的组分构成：金属铝8份、二氧化硅27份、二硼化钛36份、硼化钛4份、硅化钛10份、金属铬3份、氮化钛8份和石墨烯微粉1份；其中，所述石墨烯微粉的粒径为32～54nm。
本实施例提供一种立方氮化硼聚晶烧结体，它包括以下质量份的原料：立方氮化硼72份和所述结合剂28份；其中，所述立方氮化硼的平均粒径为8μm。
本实施例提供该立方氮化硼聚晶烧结体的制备方法，其包括以下步骤：
将所述结合剂、所述立方氮化硼混合均匀，制得混合物料；
在89MPa条件下，将所述混合物料压制成坯，得到坯体；
将所述坯体在7.2GPa、1450℃条件下烧结5min，取出，得到所述立方氮化硼聚晶烧结体。
实施例6
本实施例提供一种结合剂，它的平均粒径为289nm，由以下质量份的组分构成：金属铝9份、二氧化硅40份、二硼化钛30份、硼化钛5份、硅化钛12份、金属铬5份、氮化钛10份和石墨烯微粉1.5份；其中，所述石墨烯微粉的粒径为32～54nm。
本实施例提供一种立方氮化硼聚晶烧结体，它包括以下质量份的原料：立方氮化硼75份和所述结合剂25份；其中，所述立方氮化硼的平均粒径为6μm。
本实施例提供该立方氮化硼聚晶烧结体的制备方法，其包括以下步骤：
将所述结合剂、所述立方氮化硼混合均匀，制得混合物料；
在75MPa条件下，将所述混合物料压制成坯，得到坯体；
将所述坯体在6.8GPa、1400℃条件下烧结8min，取出，得到所述立方氮化硼聚晶烧结体。
性能检测
对实施例1～6得到的立方氮化硼聚晶烧结体的硬度、耐冲击性能和导热系数进行测试。测试结果参见表1。
具体的，采用FM-ARS900半自动显微测量系统进行硬度测试；采用落球式抗冲击试验仪进行耐冲击性能测试，试验所用钢球质量为：0.77kg，落球距离为：30cm；按照标准ASTME1461-2007进行导热性能测试。
表1实施例1～6得到的立方氮化硼聚晶烧结体的性能参数
由表1可知，本发明提供的结合剂用于制备立方氮化硼聚晶烧结体，可以有效提高聚晶立方氮化硼的硬度、韧性和导热性能。
最后应当说明的是：以上实施例仅用以说明本发明的技术方案而非对其限制；尽管参照较佳实施例对本发明进行了详细的说明，所属领域的普通技术人员应当理解：依然可以对本发明的具体实施方式进行修改或者对部分技术特征进行等同替换；而不脱离本发明技术方案的精神，其均应涵盖在本发明请求保护的技术方案范围当中。

Claims (6)

1. 一种结合剂，其特征在于，它包括以下质量份的组分：金属铝 7～12份、二氧化硅27～43份、金属铬 3～5份、硼化钛 2～7份、二硼化钛 30～40份、硅化钛8～12份和氮化钛5～10份。
2. 根据权利要求1所述的结合剂，其特征在于，它的平均粒径为200～300 nm。
3. 根据权利要求1或2所述的结合剂，其特征在于，它还包括石墨烯微粉0.5～2.5份，所述石墨烯微粉的粒径为32～54 nm。
4.一种立方氮化硼聚晶烧结体，其特征在于，它包括以下质量份的原料：立方氮化硼72～85份和权利要求1～3任一项所述的结合剂15～28份。
5. 根据权利要求4所述的立方氮化硼聚晶烧结体，其特征在于，所述立方氮化硼的平均粒径为3～10 μm。
6.一种权利要求4或5所述的立方氮化硼聚晶烧结体的制备方法，其包括以下步骤：
将所述结合剂、所述立方氮化硼混合均匀，制得混合物料；
在60～100 MPa条件下，将所述混合物料压制成坯，得到坯体；
将所述坯体在6.0～7.5 GPa、1200～1500℃条件下烧结5～10 min，取出，得到所述立方氮化硼聚晶烧结体。
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