CN114874012B - 一种高强度复相陶瓷部件及其制备方法 - Google Patents
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Abstract
本发明涉及一种高强度复相陶瓷部件及其制备方法,包括陶瓷粉和粘结剂的混合物、以及陶瓷颗粒,所述陶瓷颗粒均匀分散在所述混合物中且被混合物包裹,并通过等静压、烧结,形成外层为混合物、内层为单个陶瓷颗粒或多个陶瓷颗粒的新的陶瓷颗粒结构的高强度复相陶瓷部件。本发明利用氧化铝和氧化锆混合的陶瓷粉来增强陶瓷颗粒基体的韧性,使得陶瓷颗粒基体本身不易产生裂纹,在恶劣的工况条件下,不容易开裂,从而较好的发挥陶瓷颗粒的耐磨作用;陶瓷颗粒镶嵌在陶瓷颗粒基体内,陶瓷颗粒升温曲线相比基体更加缓慢,降低内部陶瓷颗粒出现裂纹的倾向,具有优异的抗热冲击性能,从而保证耐磨效果。
Description
技术领域
本发明涉及陶瓷材料领域,具体是指一种高强度复相陶瓷部件及其制备方法。
背景技术
目前较为先进的材料是金属-陶瓷复合耐磨材料,是通过各种工艺手段把陶瓷颗粒镶嵌到金属基体中;这种复合材料制备的耐磨部件利用了金属的韧性和陶瓷颗粒的耐高温、耐磨损、硬度高等特点。耐磨部件工作时,金属的作用是固定陶瓷颗粒,防止陶瓷颗粒脱落,陶瓷颗粒的作用是承受摩擦力,极大提高了耐磨部件的工作寿命。
金属陶瓷复合材料既兼具陶瓷颗粒的高硬度、高强度、高模量,以及金属基体的良好塑韧性和连接性而增强耐磨性能,但是现有的金属陶瓷复合材料的耐磨性还具有很大的提升空间。因此,现有技术通过陶瓷颗粒和合金粉末混合制备成陶瓷颗粒预制体棒,来增强耐磨性,但该陶瓷颗粒的烧结温度和合金粉末的熔点很难调整一致,温度过高,造成合金成分烧损,温度过低,陶瓷颗粒烧结温度不够,强度低,耐磨性能差。或者利用元素和粘结剂来增强陶瓷颗粒间的连接,形成多孔预制块,利用元素和粘结剂粘接陶瓷颗粒、和对陶瓷颗粒表面的改性来改善陶瓷和金属的润湿性,以提高金属和陶瓷的结合,但是陶瓷的摩擦承受力仍然不变。
由此可见,现有技术是通过增加陶瓷颗粒与陶瓷颗粒之间的孔隙、或者对陶瓷颗粒表面改性以改善润湿性,来增强陶瓷颗粒与金属的连接以防止陶瓷颗粒脱落,从而增强复合改料的耐磨性,但对于陶瓷颗粒本身耐磨性却没有改变,可见复合材料的耐磨性能还有很大的提升空间。
有鉴于此,特提出本申请。
发明内容
针对上述现有技术存在的问题,本发明在于提供一种高强度复相陶瓷部件及其制备方法,该适用高强度复相陶瓷部件及其制备方法能够有效解决上述现有技术存在的问题。
本发明的技术方案是:
一种高强度复相陶瓷部件,包括陶瓷粉和粘结剂的混合物、以及陶瓷颗粒,所述陶瓷颗粒均匀分散在所述混合物中且被混合物包裹,并通过等静压、烧结制成新的陶瓷颗粒结构的高强度复相陶瓷部件。
所述混合物均匀包裹单个陶瓷颗粒或多个陶瓷颗粒,形成外层为混合物、内层为单个陶瓷颗粒或多个陶瓷颗粒的新的陶瓷颗粒结构的高强度复相陶瓷部件。
所述高强度复相陶瓷部件包含重量计的陶瓷粉40~55%,陶瓷颗粒45~60%,粘结剂 0.3~4%,水0.2~2.5%。
所述陶瓷颗粒预先在温度大于1600℃的条件下经过烧结,使陶瓷颗粒的莫氏硬度大于 5.0。
所述陶瓷粉包括莫来石、刚玉、粘土、氧化铝、硅微粉、蓝晶石、尖晶石、氧化锆、碳化硅中的一种或者多种,且其粒度小于600目。
所述陶瓷颗粒包括WC、TiC、B4C、SiC、SiB6、AlN、BN中的一种或多种。
所述陶瓷颗粒的颗粒尺寸为1mm~4mm。
所述粘结剂包括硅溶胶、铝溶胶、硅酸乙酯、磷酸盐、水玻璃、羟甲基纤维素、甲基纤维素、羟丙基纤维素、羟丙基甲基纤维素、天然或人工合成树脂、聚乙烯醇、糊精、淀粉、沥青、碳基粘结剂中的一种或者多种。
包含以下具体步骤:将陶瓷粉、粘结剂、水混合后均匀包裹陶瓷颗粒形成混合包裹体;把混合包裹体放入模具中预压成型,取出放入等静压机器中用等静压成型得到半成品;将半成品烧结、自然冷却后得到陶瓷颗粒结构的高强度复相陶瓷部件。
所述烧结的温度为1500~1620℃,烧结过程为非氧化气氛或者真空烧结。
本发明的优点:
1)本发明通过由陶瓷粉和粘结剂的混合物紧紧包裹陶瓷颗粒形成的新的陶瓷颗粒结构的高强度复相陶瓷部件,通过陶瓷粉末的包裹在高温下对陶瓷颗粒进行固定,以加强陶瓷颗粒的强度,从而提高高强度复相陶瓷部件的摩擦承受力,并且粉末包裹后加大陶瓷颗粒的表面积和表面孔隙数量,从而利于增强高强度复相陶瓷部件与金属的连接,二者配合进一步提高陶瓷金属复合材料的耐磨性。
2)本发明将陶瓷粉和粘结剂制成的混合物均匀包裹单个或多个的陶瓷颗粒形成的新的陶瓷颗粒结构的高强度复相陶瓷部件,利用氧化铝和氧化锆混合的陶瓷粉来增强高强度复相陶瓷部件的韧性,使得高强度复相陶瓷部件本身不易产生裂纹,在恶劣的工况条件下,不容易开裂,从而较好的发挥陶瓷颗粒的耐磨作用;并且陶瓷颗粒镶嵌在高强度复相陶瓷部件内,陶瓷颗粒升温曲线相比基体更加缓慢,降低内部陶瓷颗粒出现裂纹的倾向,使得高强度复相陶瓷部件具有优异的抗热冲击性能,从而保证耐磨效果。
3)本发明利用粒度小于600目的陶瓷粉包裹住粒度为1~4mm的陶瓷颗粒,陶瓷颗粒具有比陶瓷粉更优异的耐磨性能,陶瓷粉包裹住陶瓷颗粒,在持续的高速摩擦和碰撞中,耐磨部件表面温度会急剧升高,最高可达400℃以上,在持续的高温状态下,陶瓷粉拥有比金属更加优异的高温抗蠕变性能,可以在持续高温状态下紧紧包裹住陶瓷颗粒,不会因基体***导致陶瓷颗粒脱落;并且陶瓷粉有比金属更好的耐高温和耐摩擦性能,从而使得用陶瓷粉包裹陶瓷颗粒制备的复相陶瓷部件的结构比金属直接包裹陶瓷颗粒有更优异的耐磨性能。
4)本发明的制备过程中,先用普通压力机对坯体成型,压力方向和预设摩擦面的方向平行,易于脱模,再进行等静压成型增强陶瓷粉和内部陶瓷颗粒的连接;陶瓷部件在烧结时,优选采用气氛保护烧结或者真空烧结,这样可以最大程度的防止陶瓷颗粒被氧化,保证陶瓷颗粒的耐磨性能;内部陶瓷颗粒作为抵抗磨损的主要部件,材质选用碳化物、氮化物、硼化物陶瓷,这几种材质具有极强的共价键,有比多数氧化物更加优异的耐磨性能。
5)本发明先将陶瓷颗粒预先经过温度大于1600℃的烧结后,再在其表面均匀覆盖粒径小于600目的陶瓷粉混合物,最后等静压成型经过温度为1500~1620℃的烧结。陶瓷颗粒预烧结确保陶瓷颗粒具有足够的强度,以有效防止生产过程中受压破坏陶瓷颗粒的形状,再均匀覆盖陶瓷粉后进行二次烧结使陶瓷颗粒和陶瓷粉末紧密粘结形成坚固的多晶致密体,从而进一步提高陶瓷部件的耐磨性能。
具体实施方式
为了便于本领域技术人员理解,现对本发明的结构作进一步详细描述:
实施例1:
一种高强度复相陶瓷部件,包括陶瓷粉和粘结剂的混合物、以及陶瓷颗粒,通过如下具体步骤制成:
S1:将重量计的陶瓷粉46%,陶瓷颗粒49.5%,石蜡3%,聚乙烯醇1%,水0.5%放入混料机混合20min,使陶瓷粉与粘结剂组成的混合物均匀包裹在陶瓷颗粒外层形成新的陶瓷结构的混合包裹体;
S1-1:陶瓷粉是由粒度小于600目的40%的氧化铝和60%的氧化锆混合构成;
S1-2:陶瓷颗粒为尺寸为1mm~4mm的WC,预先在温度大于1600℃的条件下经过烧结,使陶瓷颗粒的莫氏硬度大于5.0;
S2:把混合包裹体放入模具中用20MPa预压成型,取出放入等静压机器中用等静压成型,压力150MPa,保压2min得到半成品;
S3:半成品在温度为1620℃条件下真空烧结,真空度小于0.1Pa,保温30min,升温速率5min/℃、自然冷却后得到新的陶瓷颗粒结构的高强度复相陶瓷部件。
制备好高强度复相陶瓷部件,将其固定在铸型内表面,高强度复相陶瓷部件的体积占铸型型腔体积的50%,选择Cr含量12%的高铬铸铁作为金属基体,把金属基体熔化,预热铸型到500℃,把金属液浇铸入铸型型腔,浇铸温度1480℃,获得复相构件。
实施例2-6:
实施例2-6与实施例1的不同之处如下表1。
表1各个实施例1-6的反应条件汇总
对比例7:
选取ZTA陶瓷颗粒,颗粒尺寸为3~5mm,ZTA陶瓷颗粒和粘结剂搅拌均匀,ZTA和粘结剂比例为100:7,把混合物放入模具,70℃烘干1小时,脱模得到预制体,将预制体在1300℃下烧结30min,得到孔隙率50%的预制体,将预制体固定在砂模型腔中,预热铸型到500℃,浇铸Cr含量12%的高铬铸铁金属液到铸型,浇铸温度1480℃,得到耐磨件。
对以上各个实施例和对比例进行性能检测,利用MMH-5型环块三体磨料磨损试验机对复合材料的三体磨料磨损性能进行测试。三体磨损采用的白刚玉目数为30-80目,转速45r/min,试验力5kg,每次120min,每组样品进行三次试验,每次完成后对试样进行称重,并计算各个样品试验的磨损量,三次试验取均值作为本组样品最终数据,测定结果如下表2。
表2试验数据汇总表
编号 | 实施例1 | 实施例2 | 实施例3 | 实施例4 | 实施例5 | 实施例6 | 对比例7 |
磨损量/g | 15.0 | 24.6 | 17.3 | 29.6 | 23.1 | 15.5 | 42.0 |
由表2中可以看出,耐磨效果从优到差依次为:实施例1、实施例6、实施例3、实施例5、实施例2、实施例4、实施例7,实施例1和实施例6的复合材料的耐磨性能最好,但实施例1的增韧效果要强于实施例6;由实施例5和实施例1,实施例3和实施例5分别对比可知烧结温度高,制备的耐磨件更加致密,强度更高,耐磨效果也越好;实施例5 耐磨效果优于实施例4,实施例3耐磨效果优于实施例2,可知氧化铝和氧化锆混合的韧性比氧化铝要好,可以更好的包裹住陶瓷颗粒;前六个实施例比对比例7可知实施例耐磨性能好,从而证明复相陶瓷部件的耐磨性能远比单相ZTA的性能好;并且可将本发明与通过增加陶瓷颗粒与陶瓷颗粒之间的孔隙、或者对陶瓷颗粒表面改性等手段相互配合,进一步增强耐磨件的耐磨性。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (2)
1.一种高强度复相陶瓷部件的制备方法,其特征在于:包含以下具体步骤:
S1:将重量计的陶瓷粉46%,陶瓷颗粒49.5%,石蜡3%,聚乙烯醇1%,水0.5%放入混料机混合20min,其中,所述陶瓷粉包括氧化铝40%氧化锆60%,使陶瓷粉与粘结剂组成的混合物均匀包裹在陶瓷颗粒外层形成新的陶瓷结构的混合包裹体;
S1-1:陶瓷粉是由粒度小于600目的40%的氧化铝和60%的氧化锆混合构成;
S1-2:陶瓷颗粒为尺寸为1mm~4mm的WC,预先在温度大于1600℃的条件下经过烧结,使陶瓷颗粒的莫氏硬度大于5.0;
S2:把混合包裹体放入模具中用20MPa预压成型,取出放入等静压机器中用等静压成型,压力150MPa,保压2min得到半成品;
S3:半成品在温度为1620℃条件下真空烧结,真空度小于0.1Pa,保温30min,升温速率5min/℃、自然冷却后得到新的陶瓷颗粒结构的高强度复相陶瓷部件。
2.一种高强度复相陶瓷部件,其特征在于:所述高强度复相陶瓷部件为通过权利要求1所述制备方法获得。
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