CN114773037B - 一种教学用模型牙复合陶瓷材料的制备方法 - Google Patents
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Abstract
本发明公开了一种教学用模型牙复合陶瓷材料的制备方法,包括将一定粒度的刚玉和焦宝石粉末骨料,与助烧剂氧化镁和氧化钙粉末按一定比例混合,作为模型牙外层陶瓷原材料;将一定粒度的焦宝石粉末骨料与助烧剂氧化镁和氧化钙粉末按一定比例混合,作为模型牙内部陶瓷原材料,在一定压力下模压成粉末坯体,再在一定温度和时间下烧结成形,即获得教学用模型牙复合陶瓷材料,用于口腔医学生磨牙练习用的模型牙。这种模型牙材料来源丰富,制备成本低,结构与真牙近似,外层厚度、硬度和强度与牙釉质相近,内层硬度和强度与牙本质相近,磨牙感觉与磨真牙相似,适合作口腔科教学磨牙练习用模型牙耗材。
Description
技术领域
本发明属于模型牙材料技术领域,尤其涉及一种教学用模型牙复合陶瓷材料的制备方法。
背景技术
随着人民生活水平的提高和人口平均寿命的延长,人们对牙齿健康和美观的重视度不断提升,因牙齿缺损或美观需求而就医的患者大幅度增加,注册口腔执业医生数量也逐年增加。而口腔医学的操作性极强,医生的操作水平直接影响患者的就医体验,以及工作效率、医疗质量和事故风险,因此医生在临床操作前需要经过大量的模型牙磨牙等训练。为了提高我国口腔医生的素质和操作技能,口腔医学的教学实践条件亟待改善,其中包括给医学院口腔科学生提供大量磨牙练习用的低成本防真模型牙。口腔医学教学中,磨牙练习的目的是修补牙时用牙科工具将缺陷牙磨掉一层,教学用模型牙的消耗速度快,需求量大。可是,离体真牙数量少,常用的仿真树脂牙和石膏牙与牙体组织硬度差异大。目前常用于制造人工牙种植体和修复体的陶瓷材料有美观度、生物相容性高的要求,价格昂贵,考虑到教学用模型牙没有美观度、生物相容性要求,因此,一种成本低廉,打磨时力度、磨损等手感与真牙接近的教学用模型牙就需要被开发出来。
发明内容
发明目的:本发明的目的在于提供一种硬度和强度可控,既与真牙结构和性能相近又成本低廉的教学用模型牙复合陶瓷材料的制备方法。
技术方案:本发明的教学用模型牙复合陶瓷材料的制备方法,包括如下步骤:
步骤1、以刚玉、焦宝石粉末为骨料,氧化镁、氧化钙粉末为助烧剂,按适当比例称料,并进行充分混合;
步骤2、以焦宝石粉末为骨料,氧化镁、氧化钙粉末助烧剂,按适当比例称料,并进行充分混合;
步骤3、混合粉料装入模具,将刚玉、焦宝石、氧化镁、氧化钙混合粉料装在表层,将焦宝石、氧化镁、氧化钙混合粉料装在内层;
步骤4、在适当压力下将复合层结构的混合粉料模压成坯体;
步骤5、在一定温度和时间下烧结成复合陶瓷。
进一步地,步骤1的具体步骤为:将粒度325~600目的刚玉、焦宝石粉末和氧化镁、氧化钙粉末以75~85:15~25:1~2:1~2比例称料后混合均匀。通过刚玉的高硬度与焦宝石较低硬度的配合获得与牙釉质相近的硬度,通过少量氧化镁、氧化钙助烧剂的加入降低烧结温度,获得组织致密,晶粒细小,力学性能较高的烧结体。
进一步地,步骤2的具体步骤为:将粒度200~600目的焦宝石粉末和粒度325~600目的氧化镁、氧化钙粉末以100:1~2:1~2比例称料后混合均匀。焦宝石烧结体的硬度与牙本质相近,少量氧化镁、氧化钙助烧剂的加入是为了降低烧结温度,使组织致密,晶粒细小,力学性能提高。
进一步地,步骤3的具体步骤为:
步骤3.1、在模具中按照烧结成形后厚度1-3mm铺装外层底面混合粉料;
步骤3.2、铺装内部混合粉料;
步骤3.3、按照烧结成形后厚度1-3mm铺装外层顶面和侧面混合粉料。
进一步地,步骤4中,所述压力为4MPa~8MPa。
进一步地,步骤5中,所述温度为1350℃~1450℃,所述时间为1~2h,随炉冷却。
有益效果:与现有技术相比,本发明具有如下显著优点:
(1)本发明公开了一种教学用模型牙复合陶瓷材料的制备方法,刚玉是自然界中天然存在的氧化铝晶体,由于矿藏量少,市场上多为人造刚玉,纯度较高的为白色叫白刚玉,含有少量杂质的为棕色叫棕刚玉。刚玉质地坚硬,莫氏硬度9级,高于牙釉质莫氏硬度7~8级,常用作磨料和耐火材料。焦宝石煅烧后其组分Al2O3含量为44%左右,Fe2O3<2%,其余为SiO2,成分稳定。焦宝石质地均匀,结构致密,断面呈贝壳状,白色,莫氏硬度为5-6级,与牙本质硬度相当,常用作耐火材料。本发明以刚玉和焦宝石混合骨料为模型牙外层,以焦宝石骨料为模型牙内层,烧结后外层莫氏硬度7~8级,内层莫氏硬度5级左右,分别与牙釉质和牙本质相当。
(2)助烧剂MgO、CaO与Al2O3生成镁铝尖晶石MgAl2O3、铝酸钙CaAl2O3等促进液相在低温生成,有利于烧结陶瓷细腻和致密化。MgAl2O3、CaAl2O3能够在晶界处产生钉扎作用,抑制晶粒的生长速率。因此添加MgO、CaO能在降低烧结温度的同时提高了力学性能。
(3)本发明公开了一种教学用模型牙复合陶瓷材料的制备方法,其硬度、强度和磨牙手感接近于真牙,适用磨牙练习用模型牙耗材。
(4)普通刚玉、焦宝石粉末烧结体硬度和强度可控,来源丰富,价格低廉,用刚玉、焦宝石粉末骨料制备一种复合陶瓷材料,能够达到既与真牙结构和性能相近又成本低廉的目的。
具体实施方式
下面对本发明的技术方案作进一步说明。
实施例1:
所述对步骤(1)中以刚玉粉末、焦宝石粉末为骨料,氧化镁、氧化钙粉末为助烧剂,按适当比例称料,并进行充分混合,步骤如下:
1)将粒度为400目的刚玉粉末、粒度为500目的焦宝石粉末、粒度为400目的氧化镁和氧化钙粉末按80:20:2:1重量比称料;
2)将粉料一起加入球磨罐中,用行星式球磨机干磨100min取出。
所述对步骤(2)中以焦宝石粉末为骨料,氧化镁、氧化钙粉末助烧剂,按适当比例称料,并进行充分混合,步骤如下:
1)将粒度为500目的焦宝石粉末、粒度为400目的氧化镁和氧化钙粉末按100:2:1重量比称料;
2)将粉料一起加入球磨罐中,用行星式球磨机干磨100min取出。
所述对步骤(3)中混合粉料装入模具,将刚玉、焦宝石、氧化镁、氧化钙混合粉料装在表层,将焦宝石、氧化镁、氧化钙混合粉料装在内层,步骤如下:
1)在模具中按照烧结成形后厚度1mm铺装外层底面混合粉料;
2)铺装内部混合粉料;
3)按照烧结成形后厚度1mm铺装外层顶面和侧面混合粉料。
所述对步骤(4)中在适当压力下将复合层结构的混合粉料模压成坯体,步骤如下:
1)加压至6MPa保压30s;
2)顶出粉末压坯。
所述对步骤(5)中在适当温度下烧结适当时间。步骤如下:
1)将粉末压坯放入电阻烧结炉;
2)在1400℃下保温1.5h,断电;
3)随炉冷却到100℃以下取出,冷却到室温。
测得烧结样品的表面莫氏硬度7级,内部莫氏硬度5.5级,三点弯曲法抗弯强度为95MPa。
实施例2:
所述对步骤(1)中以刚玉粉末、焦宝石粉末为骨料,氧化镁、氧化钙粉末为助烧剂,按适当比例称料,并进行充分混合,步骤如下:
1)将粒度为600目的刚玉粉末、粒度为600目的焦宝石粉末、粒度为600目的氧化镁和氧化钙粉末按85:15:1:2重量比称料;
2)将粉料一起加入球磨罐中,用行星式球磨机干磨95min取出。
所述对步骤(2)中以焦宝石粉末为骨料,氧化镁、氧化钙粉末助烧剂,按适当比例称料,并进行充混合,步骤如下:
1)将粒度为600目的焦宝石粉末、粒度为600目的氧化镁和氧化钙粉末按100:1.5:1.5称料;
2)将粉料一起加入球磨罐中,用行星式球磨机干磨95min取出;
所述对步骤(3)中混合粉料装入模具,将刚玉、焦宝石、氧化镁、氧化钙混合粉料装在表层,将焦宝石、氧化镁、氧化钙混合粉料装在内层,步骤如下:
4)在模具中按照烧结成形后厚度3mm铺装外层底面混合粉料;
5)铺装内部混合粉料;
6)按照烧结成形后厚度3mm铺装外层顶面和侧面混合粉料。
所述对步骤(4)中在适当压力下将复合层结构的混合粉料模压成坯体,步骤如下:
1)加压至8MPa保压40s;
2)顶出粉末压坯。
所述对步骤(5)中在适当温度下烧结适当时间。步骤如下:
1)将粉末压坯放入电阻烧结炉;
2)在1350℃下保温2h,断电;
3)随炉冷却到100℃以下取出,冷却到室温。
测得烧结样品的表面莫氏硬度8级,内部莫氏硬度6级,三点弯曲法抗弯强度为102MPa。
实施例3:
所述对步骤(1)中以刚玉粉末、焦宝石粉末为骨料,氧化镁、氧化钙粉末为助烧剂,按适当比例称料,并进行充分混合,步骤如下:
1)将粒度为325目的刚玉粉末、粒度为325目的焦宝石粉末、粒度为325目的氧化镁和氧化钙粉末按75:25:2:1称料;
2)将粉料一起加入球磨罐中,用行星式球磨机干磨120min取出。
所述对步骤(2)中以焦宝石粉末为骨料,氧化镁、氧化钙粉末助烧剂,按适当比例称料,并进行充混合,步骤如下:
1)将粒度为200目的焦宝石粉末、粒度为325目的氧化镁和氧化钙粉末按100:2:1称料;
2)将粉料一起加入球磨罐中,用行星式球磨机干磨120min取出。
所述对步骤(3)中混合粉料装入模具,将刚玉、焦宝石、氧化镁、氧化钙混合粉料装在表层,将焦宝石、氧化镁、氧化钙混合粉料装在内层,步骤如下:
1)在模具中按照烧结成形后厚度2mm铺装外层底面混合粉料;
2)铺装内部混合粉料;
3)按照烧结成形后厚度2mm铺装外层顶面和侧面混合粉料。
所述对步骤(4)中在适当压力下将复合层结构的混合粉料模压成坯体,步骤如下:
1)加压至4MPa保压50s;
2)顶出粉末压坯。
所述对步骤(5)中在适当温度下烧结适当时间,步骤如下:
1)将粉末压坯放入电阻烧结炉;
2)在1450℃下保温1.5h,断电;
3)随炉冷却到100℃以下取出,冷却到室温。
测得烧结样品的表面莫氏硬度8级,内部莫氏硬度6级,三点弯曲法抗弯强度为75MPa。
上述实施例经学生磨牙试验对比,手感与真牙相近。
对比例1:
所述对步骤(1)中以刚玉粉末、高岭石粉末为骨料,氧化镁、氧化钙粉末为助烧剂,按适当比例称料,并进行充分混合,步骤如下:
1)将粒度为600目的石英石粉末、粒度为600目的高岭石粉末、粒度为600目的氧化镁和氧化钙粉末按85:15:1:2重量比称料;
2)将粉料一起加入球磨罐中,用行星式球磨机干磨95min取出。
所述对步骤(2)中以高岭石粉末为骨料,氧化镁、氧化钙粉末助烧剂,按适当比例称料,并进行充混合,步骤如下:
1)将粒度为600目的高岭石粉末、粒度为600目的氧化镁和氧化钙粉末按100:1.5:1.5称料;
2)将粉料一起加入球磨罐中,用行星式球磨机干磨95min取出;
所述对步骤(3)中混合粉料装入模具,将石英石、高岭石、氧化镁、氧化钙混合粉料装在表层,将高岭石、氧化镁、氧化钙混合粉料装在内层,步骤如下:
7)在模具中按照烧结成形后厚度3mm铺装外层底面混合粉料;
8)铺装内部混合粉料;
9)按照烧结成形后厚度3mm铺装外层顶面和侧面混合粉料。
所述对步骤(4)中在适当压力下将复合层结构的混合粉料模压成坯体,步骤如下:
1)加压至8MPa保压40s;
2)顶出粉末压坯。
所述对步骤(5)中在适当温度下烧结适当时间。步骤如下:
1)将粉末压坯放入电阻烧结炉;
2)在1350℃下保温2h,断电;
3)随炉冷却到100℃以下取出,冷却到室温。
测得烧结样品的表面莫氏硬度6级,内部莫氏硬度4级,三点弯曲法抗弯强度为70MPa。
对比例2:
所述对步骤(1)中以刚玉粉末、焦宝石粉末为骨料,按适当比例称料,并进行充分混合,步骤如下:
1)将粒度为325目的刚玉粉末、粒度为325目的焦宝石粉末按75:25称料;
2)将粉料一起加入球磨罐中,用行星式球磨机干磨120min取出。
所述对步骤(2)中以焦宝石粉末为骨料,氧化钙粉末助烧剂,按适当比例称料,并进行充混合,步骤如下:
1)将粒度为200目的焦宝石粉末、粒度为325目的氧化钙粉末按100:2.5称料;
2)将粉料一起加入球磨罐中,用行星式球磨机干磨120min取出。
所述对步骤(3)中混合粉料装入模具,将刚玉、焦宝石混合粉料装在表层,将焦宝石、氧化钙混合粉料装在内层,步骤如下:
1)在模具中按照烧结成形后厚度2mm铺装外层底面混合粉料;
2)铺装内部混合粉料;
3)按照烧结成形后厚度2mm铺装外层顶面和侧面混合粉料。
所述对步骤(4)中在适当压力下将复合层结构的混合粉料模压成坯体,步骤如下:
1)加压至4MPa保压50s;
2)顶出粉末压坯。
所述对步骤(5)中在适当温度下烧结适当时间,步骤如下:
1)将粉末压坯放入电阻烧结炉;
2)在1450℃下保温1.5h,断电;
3)随炉冷却到100℃以下取出,冷却到室温。
测得烧结样品的表面莫氏硬度7级,内部莫氏硬度5级,三点弯曲法抗弯强度为55MPa。
上述对比例1内外层硬度分别比牙釉质和牙本质低,对比例2强度过低,经学生磨牙试验对比,手感与真牙相差较大,其中比例2在磨牙过程中有剥落和掉粉现象。
Claims (1)
1.一种教学用模型牙复合陶瓷材料的制备方法,其特征在于,包括如下步骤:
步骤1、以刚玉、焦宝石粉末为骨料,氧化镁、氧化钙粉末为助烧剂,按适当比例称料,并进行充分混合;
步骤2、以焦宝石粉末为骨料,氧化镁、氧化钙粉末助烧剂,按适当比例称料,并进行充分混合;
步骤3、混合粉料装入模具,将刚玉、焦宝石、氧化镁、氧化钙混合粉料装在表层,将焦宝石、氧化镁、氧化钙混合粉料装在内层;
步骤4、在适当压力下将复合层结构的混合粉料模压成坯体;
步骤5、在一定温度和时间下烧结成复合陶瓷;
步骤1的具体步骤为:将粒度325~600目的刚玉、焦宝石粉末和氧化镁、氧化钙粉末以75~85:15~25: 1~2:1~2比例称料后混合均匀;步骤2的具体步骤为:将粒度200~600目的焦宝石粉末和粒度325~600目的氧化镁、氧化钙粉末以100:1~2:1~2比例称料后混合均匀;
步骤3的具体步骤为:
步骤3.1、在模具中按照烧结成形后厚度1-3mm铺装表层底面混合粉料;
步骤3.2、铺装内层混合粉料;
步骤3.3、按照烧结成形后厚度1-3mm铺装表层顶面和侧面混合粉料;
步骤4中,所述压力为4MPa~8MPa;步骤5中,所述温度为1350℃~1450℃,所述时间为1~2h,随炉冷却。
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