CN106478090A - 钛酸铋‑铌酸钙固溶体高频电介质陶瓷的制备方法 - Google Patents

钛酸铋‑铌酸钙固溶体高频电介质陶瓷的制备方法 Download PDF

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CN106478090A
CN106478090A CN201610874782.0A CN201610874782A CN106478090A CN 106478090 A CN106478090 A CN 106478090A CN 201610874782 A CN201610874782 A CN 201610874782A CN 106478090 A CN106478090 A CN 106478090A
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董思远
樊小健
高勇
王晓莉
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Xian Jiaotong University
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Abstract

本发明公开了一种钛酸铋‑铌酸钙固溶体高频电介质陶瓷的制备方法,目的在于,使制备的钛酸铋‑铌酸钙固溶体高频电介质陶瓷具有高介电常数、低介电损耗、低烧结温度和宽成瓷温度范围的优点,且成本低、环保无污染,所采用的技术方案为:1)按照(1‑x)Bi2Ti2O7‑xCa2Nb2O7中化学计量比称量原材料;2)将原材料进行球磨后烘干,烘干后进行预合成;3)预合成后的粉料进行粗粉碎后进行二次球磨并烘干;4)对烘干后的粉料进行造粒,造粒后压制成薄圆片素坯;5)对薄圆片素坯进行高温排粘后自然冷却;6)对高温排粘后的薄圆片素坯进行高温烧结后自然冷却。

Description

钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法
技术领域
本发明涉及高频热补偿电容器瓷和高频热稳定电容器瓷材料,具体涉及钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法。
背景技术
随着现代化工业程度的快速发展,特别是大规模集成电路的推广和应用以及表面组装技术(SMT)的发展,对材料要求越来越微型化、高精度化、环保化。陶瓷电介质材料作为功能电子材料的重要组成部分,被广泛应用于各种元器件中,如电容器、谐振器、滤波器、电路基片、集成电路等。
铋基高频介质陶瓷材料因其烧结温度低,介电常数高,与银电极良好的结合,烧结成瓷的致密性良好,热、力学性能优良等优点,成为MLCC/LTCC(多层/低温共烧陶瓷)材料研发的热点。
焦绿石结构的钛酸铋-铌酸钙固溶体系((1-x)Bi2Ti2O7-xCa2Nb2O7,BT-xCN)电介质陶瓷作为一种新开发的电介质陶瓷材料,有着烧结温度低、容易形成致密的陶瓷和介电性能优良等优点,被系统地进行了研究。目前的工艺方法制备的钛酸铋-铌酸钙固溶体高频电介质陶瓷存在介电常数低、介电损耗高、烧结温度高等的缺陷。
发明内容
为了解决现有技术中的问题,本发明提出一种钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法,使制备的钛酸铋-铌酸钙固溶体高频电介质陶瓷具有高介电常数、低介电损耗、低烧结温度和宽成瓷温度范围的优点,且成本低、环保无污染。
为了实现以上目的,本发明所采用的技术方案为:包括以下步骤:
1)按照(1-x)Bi2Ti2O7-xCa2Nb2O7中化学计量比称量原材料;
2)将原材料进行球磨后烘干,烘干后进行预合成;
3)预合成后的粉料进行粗粉碎后进行二次球磨并烘干;
4)对烘干后的粉料进行造粒,造粒后压制成薄圆片素坯;
5)对薄圆片素坯进行高温排粘后自然冷却;
6)对高温排粘后的薄圆片素坯进行高温烧结后自然冷却,即得到钛酸铋-铌酸钙固溶体高频电介质陶瓷。
所述步骤1)中原材料包括Bi2O3、CaCO3、Nb2O5和TiO2
所述步骤1)中原材料的化学计量比为:Bi2O3:CaCO3:Nb2O5:TiO2=(1-x):x:x:(1-x),其中0.3≤x≤0.7。
所述Bi2O3、CaCO3、Nb2O5和TiO2均为分析纯原料。
所述步骤2)中预合成的温度为850~950℃,保温时间为2~4h。
所述步骤4)中在烘干后的粉料中加入PVA进行造粒。
所述步骤5)中高温排粘的温度为500-550℃。
所述步骤5)中高温烧结的温度为1100~1200℃,保温时间为2~4h。
所述步骤2)和3)中采用恒温干燥箱进行烘干。
与现有技术相比,本发明对球磨后的粉料进行高温预合成,对预合成后的粉料粗粉碎后进行二次球磨,进行造粒后压制成薄圆片素坯,薄圆片素坯高温排粘后进行高温烧结,即得到钛酸铋-铌酸钙固溶体高频电介质陶瓷,制备的铋基陶瓷材料为焦绿石结构,瓷质致密,介电性能良好,介电常数为150~170,介电损耗tanδ≤1×10-3,温度系数(TCC)为-900~-700ppm/℃。本发明的方法中制备的固溶体系陶瓷材料有以下优点:1)通过调节x的值调节介电性能以满足不同的要求;2)陶瓷材料的介电常数大(150~170);3)烧结温度低、烧结范围广;4)材料成本低、环保无污染。
附图说明
图1为本发明制备的钛酸铋-铌酸钙固溶体高频电介质陶瓷室温下的X射线衍射谱图;
图2a、2b和2c分别为本发明制备的钛酸铋-铌酸钙固溶体高频电介质陶瓷介电常数、介电损耗和温度系数与烧结温度的关系,图中为x取0.3、0.4、0.5、0.6和0.7的五种情况,即BT-0.3CN、BT-0.4CN、BT-0.5CN、BT-0.6CN和BT-0.7CN。
具体实施方式
下面结合具体的实施例和说明书附图对本发明作进一步的解释说明。
本发明包括以下步骤:
1)按照化学式的化学计量比称量原材料,化学计量比为Bi2O3:CaCO3:Nb2O5:TiO2=(1-x):x:x:(1-x),其中0.3≤x≤0.7,Bi2O3、CaCO3、Nb2O5和TiO2均为市售分析纯原料;
2)将称量好的原料置于球磨罐中一次球磨,将混合好的浆料置于恒温干燥箱中烘干;
3)将烘干后的混合粉料放入坩锅中,在850~950℃高温下进行预合成,保温时间为2~4h;
4)对预合成的粉料经粗粉碎后,进行二次球磨,将细粉碎后的浆料在恒温干燥箱烘干;
5)在烘干后的粉料中加入适量的PVA进行造粒;然后压制成薄圆片素坯;
6)将圆片素坯置于箱式高温电炉中在500-550℃下进行排粘,使材料中的PVA粘合剂排出,之后随炉自然冷却;
7)将排粘后的素坯置于箱式高温电炉中,在1100~1200℃高温下烧结,保温时间为2~4h,得到钛酸铋-铌酸钙固溶体高频电介质陶瓷。
参见图1,本发明制备的钛酸铋-铌酸钙固溶体高频电介质陶瓷使用XRD衍射仪测试为类焦绿石结构,参见图2a~2c,采用介电测试系统测量的介电常数为150~170,介电损耗tanδ≤1×10-3,温度系数(TCC)为-900~-700ppm/℃,瓷质致密,介电性能良好,本发明制备的钛酸铋-铌酸钙固溶体高频电介质陶瓷有以下优点:1)通过调节x的值调节介电性能以满足不同的要求;2)陶瓷材料的介电常数大(150~170);3)烧结温度低、烧结范围广;4)材料成本低、环保无污染。
实施例1:
1)按照化学式的化学计量比称量原材料,化学计量比为Bi2O3:CaCO3:Nb2O5:TiO2=0.7:0.3:0.3:0.7;
2)将称量好的原料置于球磨罐中一次球磨,将混合好的浆料置于恒温干燥箱中烘干;
3)将烘干后的混合粉料放入坩锅中,在适当的高温下进行预合成,预合成温度为850℃;
4)对预合成的粉料经粗粉碎后,进行二次球磨,将细粉碎后的浆料在恒温干燥箱烘干;
5)在烘干后的粉料中加入适量的PVA进行造粒;然后压制成薄圆片素坯;
6)将圆片素坯置于箱式高温电炉中进行排粘,之后随炉自然冷却;
7)将排粘后的素坯置于箱式高温电炉中,在适当高温下烧结,烧结温度为1100℃,得到钛酸铋-铌酸钙固溶体系陶瓷材料;
参见图1,使用XRD衍射仪测试钛酸铋-铌酸钙固溶体陶瓷结构为类焦绿石结构;图2a~2c使用介电测试系统测量其介电常数为163,介电损耗为0.0014,温度系数为-730ppm/℃。
实施例2:
1)按照化学式的化学计量比称量原材料,化学计量比为Bi2O3:CaCO3:Nb2O5:TiO2=0.6:0.4:0.4:0.6;
2)将称量好的原料置于球磨罐中一次球磨,将混合好的浆料置于恒温干燥箱中烘干;
3)将烘干后的混合粉料放入坩锅中,在适当的高温下进行预合成,预合成温度为850℃;
4)对预合成的粉料经粗粉碎后,进行二次球磨,将细粉碎后的浆料在恒温干燥箱烘干;
5)在烘干后的粉料中加入适量的PVA进行造粒;然后压制成薄圆片素坯;
6)将圆片素坯置于箱式高温电炉中进行排粘,之后随炉自然冷却;
7)将排粘后的素坯置于箱式高温电炉中,在适当高温下烧结,烧结温度为1100℃,得到钛酸铋-铌酸钙固溶体系陶瓷材料;
参见图1,使用XRD衍射仪测试钛酸铋-铌酸钙固溶体陶瓷结构为类焦绿石结构;参见图2a~2c,使用介电测试系统测量其介电常数为160,介电损耗为0.0007,温度系数为-850ppm/℃。
实施例3:
1)按照化学式的化学计量比称量原材料,化学计量比为Bi2O3:CaCO3:Nb2O5:TiO2=0.5:0.5:0.5:0.5;
2)将称量好的原料置于球磨罐中一次球磨,将混合好的浆料置于恒温干燥箱中烘干;
3)将烘干后的混合粉料放入坩锅中,在适当的高温下进行预合成,预合成温度为850℃;
4)对预合成的粉料经粗粉碎后,进行二次球磨,将细粉碎后的浆料在恒温干燥箱烘干;
5)在烘干后的粉料中加入适量的PVA进行造粒;然后压制成薄圆片素坯;
6)将圆片素坯置于箱式高温电炉中进行排粘,之后随炉自然冷却;
7)将排粘后的素坯置于箱式高温电炉中,在适当高温下烧结,烧结温度为1200℃,得到钛酸铋-铌酸钙固溶体系陶瓷材料;
参见图1,使用XRD衍射仪测试钛酸铋-铌酸钙固溶体陶瓷结构为类焦绿石结构;参见图2a~2c,使用介电测试系统测量其介电常数为155,介电损耗为0.0004,温度系数为-950ppm/℃。
实施例4:
1)按照化学式的化学计量比称量原材料,化学计量比为Bi2O3:CaCO3:Nb2O5:TiO2=0.5:0.5:0.5:0.5;
2)将称量好的原料置于球磨罐中一次球磨,将混合好的浆料置于恒温干燥箱中烘干;
3)将烘干后的混合粉料放入坩锅中,在适当的高温下进行预合成,预合成温度为850℃;
4)对预合成的粉料经粗粉碎后,进行二次球磨,将细粉碎后的浆料在恒温干燥箱烘干;
5)在烘干后的粉料中加入适量的PVA进行造粒;然后压制成薄圆片素坯;
6)将圆片素坯置于箱式高温电炉中进行排粘,之后随炉自然冷却;
7)将排粘后的素坯置于箱式高温电炉中,在适当高温下烧结,烧结温度为1250℃,得到钛酸铋-铌酸钙固溶体系陶瓷材料;
参见图1,使用XRD衍射仪测试钛酸铋-铌酸钙固溶体陶瓷结构为类焦绿石结构;参见图2a~2c,使用介电测试系统测量其介电常数为145,介电损耗为0.0005,温度系数为-920ppm/℃,性能较烧结温度低的稍差。
实施例5:
1)按照化学式的化学计量比称量原材料,化学计量比为Bi2O3:CaCO3:Nb2O5:TiO2=0.4:0.6:0.6:0.4;
2)将称量好的原料置于球磨罐中一次球磨,将混合好的浆料置于恒温干燥箱中烘干;
3)将烘干后的混合粉料放入坩锅中,在适当的高温下进行预合成,预合成温度为900℃;
4)对预合成的粉料经粗粉碎后,进行二次球磨,将细粉碎后的浆料在恒温干燥箱烘干;
5)在烘干后的粉料中加入适量的PVA进行造粒;然后压制成薄圆片素坯;
6)将圆片素坯置于箱式高温电炉中进行排粘,之后随炉自然冷却;
7)将排粘后的素坯置于箱式高温电炉中,在适当高温下烧结,烧结温度为1150℃,得到钛酸铋-铌酸钙固溶体系陶瓷材料。
实施例6:
1)按照化学式的化学计量比称量原材料,化学计量比为Bi2O3:CaCO3:Nb2O5:TiO2=0.3:0.7:0.7:0.3;
2)将称量好的原料置于球磨罐中一次球磨,将混合好的浆料置于恒温干燥箱中烘干;
3)将烘干后的混合粉料放入坩锅中,在适当的高温下进行预合成,预合成温度为950℃;
4)对预合成的粉料经粗粉碎后,进行二次球磨,将细粉碎后的浆料在恒温干燥箱烘干;
5)在烘干后的粉料中加入适量的PVA进行造粒;然后压制成薄圆片素坯;
6)将圆片素坯置于箱式高温电炉中进行排粘,之后随炉自然冷却;
7)将排粘后的素坯置于箱式高温电炉中,在适当高温下烧结,烧结温度为1200℃,得到钛酸铋-铌酸钙固溶体系陶瓷材料。

Claims (9)

1.钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法,其特征在于,包括以下步骤:
1)按照(1-x)Bi2Ti2O7-xCa2Nb2O7中化学计量比称量原材料;
2)将原材料进行球磨后烘干,烘干后进行预合成;
3)预合成后的粉料进行粗粉碎后进行二次球磨并烘干;
4)对烘干后的粉料进行造粒,造粒后压制成薄圆片素坯;
5)对薄圆片素坯进行高温排粘后自然冷却;
6)对高温排粘后的薄圆片素坯进行高温烧结后自然冷却,即得到钛酸铋-铌酸钙固溶体高频电介质陶瓷。
2.根据权利要求1所述的钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法,其特征在于,所述步骤1)中原材料包括Bi2O3、CaCO3、Nb2O5和TiO2
3.根据权利要求2所述的钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法,其特征在于,所述步骤1)中原材料的化学计量比为:Bi2O3:CaCO3:Nb2O5:TiO2=(1-x):x:x:(1-x),其中0.3≤x≤0.7。
4.根据权利要求3所述的钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法,其特征在于,所述Bi2O3、CaCO3、Nb2O5和TiO2均为分析纯原料。
5.根据权利要求1所述的钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法,其特征在于,所述步骤2)中预合成的温度为850~950℃,保温时间为2~4h。
6.根据权利要求1所述的钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法,其特征在于,所述步骤4)中在烘干后的粉料中加入PVA进行造粒。
7.根据权利要求1所述的钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法,其特征在于,所述步骤5)中高温排粘的温度为500-550℃。
8.根据权利要求1所述的钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法,其特征在于,所述步骤5)中高温烧结的温度为1100~1200℃,保温时间为2~4h。
9.根据权利要求1所述的钛酸铋-铌酸钙固溶体高频电介质陶瓷的制备方法,其特征在于,所述步骤2)和3)中采用恒温干燥箱进行烘干。
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