CN110386809A - 一种硅基陶瓷型芯及其制备方法 - Google Patents
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Abstract
本发明公开了一种硅基陶瓷型芯及其制备方法,该硅基陶瓷型芯由以下重量份的原料制成:石英玻璃粉60‑67份、锆英砂30份、SiO2添加剂3‑10份,按照设定的比例称取各原料,混合,烘干,加入增塑剂搅拌;将混合好的料浆压制成型,脱模,得到坯体,将压制好的坯体试样埋入煅烧α型氧化铝填料;按照设定的加热速度升温烧结,最后将烧结好的试样放入硅酸乙酯强化液中静置后自干,即得型芯。本发明所述的一种硅基陶瓷型芯及其制备方法,硅基陶瓷型芯烧结收缩率低,高温抗弯性能优良,尺寸控制较好,表面光滑,并且在进行金属浇注时,脱芯容易,不会在金属与型芯界面处形成机械粘砂。
Description
技术领域
本发明涉及硅基陶瓷型芯领域,特别涉及一种硅基陶瓷型芯及其制备方法。
背景技术
现代航空发动机正朝着高推动比的方向发展,而提高发动机推重比的最有效方法就是提高涡轮前进口温度,这对于涡轮叶片的耐高温性能提出了更高的要求。从材料本身而言,利用合金化来提高材料的承温能力目前已接近极限,而热膨胀系数的差异也使得高温防护涂层材料在叶片上的应用受到限制。
随着先进气冷技术的发展,叶片的内腔形状也日益复杂,采用常规的浸渍涂料、撒沙等熔模铸造工艺难以实施,需预制陶瓷型芯,内腔一次精确成形,因此高性能陶瓷型芯的制备技术受到广泛关注。氧化铝基型芯的熔点较高,抗弯强度性能优良,但化学稳定性高,不易在强碱性环境下溶解脱除,铸件表面易遭到腐蚀,废品率高。
采用以石英玻璃为主体材料的硅基陶瓷型芯能解决上述问题。石英具有良好的抗变温性能,保证在焙烧和浇注过程中不因温度剧变而使型芯断裂。同时添加锆英砂作为矿化剂,能够控制烧结过程中产生的方石英含量,降低陶瓷的烧结收缩率和高温挠度,以保证型芯的尺寸精度与优异的机械性能。
目前广泛使用的硅基陶瓷型芯在浇注铸件时,会与金属熔液中的Al、C等元素发生化学反应,在金属与型芯的界面上产生大量的气孔和粘砂,影响内腔的平整性与形状尺寸。
采用以热塑性材料(如石蜡)作为增塑剂来制成硅基陶瓷型芯配料,再利用热压注成型,高温烧结制成型芯,能有效抑制其与金属熔液接触反应,表面光洁,易溶于熔融碱和氢氟酸中,加之一定的机械振动,脱芯方便,而
且对铸件不损伤,化学稳定性好。
发明内容
本发明的主要目的在于提供一种硅基陶瓷型芯及其制备方法,可以有效解决背景技术中的问题。
为实现上述目的,本发明采取的技术方案为:
一种硅基陶瓷型芯,该硅基陶瓷型芯由以下重量份的原料制成:石英玻璃粉60-67份、锆英砂30份、SiO2添加剂3-10份。
优选的,该硅基陶瓷型芯由以下重量份的原料制成:石英玻璃粉60份、锆英砂30份、SiO2添加剂10份。
优选的,该硅基陶瓷型芯由以下重量份的原料制成:石英玻璃粉67份、锆英砂30份、SiO2添加剂3份。
优选的,所述石英玻璃粉的粒度为200-240目、280-320目、360-400目以下,锆英砂的粒度为0.5-15.00μm,SiO2添加剂的粒度为0.5-15.00μm。
硅基陶瓷型芯的制备方法,将所述原料压制成型,高温烧结,再放入高温强化液中静置后自干,即得到所述硅基陶瓷型芯。
优选的,该硅基陶瓷型芯的制备方法,包括以下步骤:
步骤一、按照设定的比例称取各原料,混合,烘干,加入增塑剂搅拌;
步骤二、将混合好的料浆压制成型,脱模,得到坯体,将压制好的坯体试样埋入煅烧α型氧化铝填料;
步骤三、按照设定的加热速度升温烧结,最后将烧结好的试样放入硅酸乙酯强化液中静置后自干,即得型芯。
优选的,所述的增塑剂组成为白石蜡93份,黄蜂蜡5份,高压聚乙烯2份,所述的氧化铝填料的粒度为200目。
硅基陶瓷型芯的制备方法,包括以下步骤:
步骤一、按照设定的比例称取石英玻璃粉、锆英砂、SiO2添加剂,混合放入球磨罐中,加入原料总重二分之一的二氧化硅球,球磨2h;
步骤二、将球磨好的混合粉料放入烘干箱内,在150℃下烘干2h;
步骤三、将混合粉料总重的18%的增塑剂加入料浆搅拌机并加热至120℃,待增塑剂融化后,取出烘干的混合粉料,加入料浆搅拌机中匀速搅拌30h,即型芯配料制作完毕;
步骤四、将混合好的型芯配料压制成型,成型工艺为在50MPa-60MPa的压力下保压15-20s,然后进行脱模,得到坯体;
步骤五、将压制好的坯体试样埋入煅烧α型氧化铝填料,按照以下温度设定进行烧结:
室温—200℃:升温1h,保温2h;
200℃—400℃:升温2h,保温4h;
400℃—600℃:升温1h,保温1h;
600℃—900℃:升温1h,保温1h;
900℃—(1140—1160)℃:升温2h,保温4h;
保温结束后随炉冷却至600℃以下开炉门;
步骤六、将烧结合格的坯体试样放入硅酸乙酯强化液中,静置强化4h后取出,自干24h,即得型芯。
与现有技术相比,本发明具有如下有益效果:本发明公开的硅基陶瓷型芯烧结收缩率低,高温抗弯性能优良,尺寸控制较好,表面光滑,并且在进行金属浇注时,脱芯容易,不会在金属与型芯界面处形成机械粘砂。
附图说明
图1为高温烧结工艺曲线图。
具体实施方式
为使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体实施方式,进一步阐述本发明。
实施例1
按照设定的比例称取60份石英玻璃粉、30份锆英砂、10份SiO2添加剂,混合放入球磨罐中,加入原料总重二分之一的二氧化硅球,球磨2h;
将球磨好的混合粉料放入烘干箱内,在150℃下烘干2h;
将混合粉料总重的18%的增塑剂加入料浆搅拌机并加热至120℃,待增塑剂融化后,取出烘干的混合粉料,加入料浆搅拌机中匀速搅拌30h,即型芯配料制作完毕;
将混合好的型芯配料压制成型,成型工艺为在50MPa的压力下保压20s,然后进行脱模,得到坯体;
将压制好的坯体试样埋入煅烧α型氧化铝填料,按照图1所示温度设定进行烧结;
将烧结合格的坯体试样放入硅酸乙酯强化液中,静置强化4h后取出,自干24h,即得型芯。
所得型芯烧结收缩率为0.44%,高温挠度为0.28mm。
实施例2
按照设定的比例称取67份石英玻璃粉、30份锆英砂、3份SiO2添加剂,混合放入球磨罐中,加入原料总重二分之一的二氧化硅球,球磨2h;
将球磨好的混合粉料放入烘干箱内,在150℃下烘干2h;
将混合粉料总重的18%的增塑剂加入料浆搅拌机并加热至120℃,待增塑剂融化后,取出烘干的混合粉料,加入料浆搅拌机中匀速搅拌30h,即型芯配料制作完毕;
将混合好的型芯配料压制成型,成型工艺为在60MPa的压力下保压15s,然后进行脱模,得到坯体;
将压制好的坯体试样埋入煅烧α型氧化铝填料,按照图1所示温度设定进行烧结;
将烧结合格的坯体试样放入硅酸乙酯强化液中,静置强化4h后取出,自干24h,即得型芯。
所得型芯烧结收缩率为0.40%,高温挠度为0.46mm。
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。
Claims (8)
1.一种硅基陶瓷型芯,其特征在于,该硅基陶瓷型芯由以下重量份的原料制成:石英玻璃粉60-67份、锆英砂30份、SiO2添加剂3-10份。
2.根据权利要求1所述的硅基陶瓷型芯,其特征在于,由以下重量份的原料制成:石英玻璃粉60份、锆英砂30份、SiO2添加剂10份。
3.根据权利要求1所述的硅基陶瓷型芯,其特征在于,由以下重量份的原料制成:石英玻璃粉67份、锆英砂30份、SiO2添加剂3份。
4.根据权利要求1所述的硅基陶瓷型芯,其特征在于,所述石英玻璃粉的粒度为200-240目、280-320目、360-400目以下,锆英砂的粒度为0.5-15.00μm,SiO2添加剂的粒度为0.5-15.00μm。
5.权利要求1-4任一项所述的硅基陶瓷型芯的制备方法,其特征在于,将所述原料压制成型,高温烧结,再放入高温强化液中静置后自干,即得到所述硅基陶瓷型芯。
6.根据权利要求5所述的硅基陶瓷型芯的制备方法,其特征在于,包括以下步骤:
步骤一、按照设定的比例称取各原料,混合,烘干,加入增塑剂搅拌;
步骤二、将混合好的料浆压制成型,脱模,得到坯体,将压制好的坯体试样埋入煅烧α型氧化铝填料;
步骤三、按照设定的加热速度升温烧结,最后将烧结好的试样放入硅酸乙酯强化液中静置后自干,即得型芯。
7.根据权利要求5所述的硅基陶瓷型芯的制备方法,其特征在于,所述的增塑剂组成为白石蜡93份,黄蜂蜡5份,高压聚乙烯2份,所述的氧化铝填料的粒度为200目。
8.根据权利要求5所述的硅基陶瓷型芯的制备方法,其特征在于,包括以下步骤:
步骤一、按照设定的比例称取石英玻璃粉、锆英砂、SiO2添加剂,混合放入球磨罐中,加入原料总重二分之一的二氧化硅球,球磨2h;
步骤二、将球磨好的混合粉料放入烘干箱内,在150℃下烘干2h;
步骤三、将混合粉料总重的18%的增塑剂加入料浆搅拌机并加热至120℃,待增塑剂融化后,取出烘干的混合粉料,加入料浆搅拌机中匀速搅拌30h,即型芯配料制作完毕;
步骤四、将混合好的型芯配料压制成型,成型工艺为在50MPa-60MPa的压力下保压15-20s,然后进行脱模,得到坯体;
步骤五、将压制好的坯体试样埋入煅烧α型氧化铝填料,按照以下温度设定进行烧结:
室温—200℃:升温1h,保温2h;
200℃—400℃:升温2h,保温4h;
400℃—600℃:升温1h,保温1h;
600℃—900℃:升温1h,保温1h;
900℃—(1140—1160)℃:升温2h,保温4h;
保温结束后随炉冷却至600℃以下开炉门;
步骤六、将烧结合格的坯体试样放入硅酸乙酯强化液中,静置强化4h后取出,自干24h,即得型芯。
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