CN106277800A - Preparation method and application of Li2O-Al2O3-SiO2 system glass-ceramics - Google Patents
Preparation method and application of Li2O-Al2O3-SiO2 system glass-ceramics Download PDFInfo
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Abstract
本发明公开了一种Li2O‑Al2O3‑SiO2系统微晶玻璃的制备方法和应用；该玻璃包括按氧化物为基准的以重量份计的以下组分：SiO2 58‑68份、Al2O3 1‑4份、ZrO2 1‑3份、P2O5 0.5‑1份、K2O 0.5‑2份、CeO2 0.5‑1份和Li2O 25‑28份。具体制备时，按照比例称取各组分的物料，混合均匀；然后在1450‑1480℃下熔制2‑5h，得到高均匀性的玻璃液；再对玻璃液消除气泡和条纹，最后进入模具内冷却成型即可；其中以ZrO2和P2O5作为混合晶核剂，前者在玻璃系统中主要诱导形成主晶相为β‑石英固溶体，后者主要促进ZrO2在玻璃中的溶解，提高成核速率，二者相互促进，从而得到晶粒更细的微晶玻璃，这样得到的微晶玻璃强度高，生物相容性好，具有广泛的应用价值。The invention discloses a preparation method and application of Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramics; the glass includes the following components in parts by weight based on oxides: SiO 2 58-68 parts, Al 2 O 3 1-4 parts, ZrO 2 1-3 parts, P 2 O 5 0.5-1 parts, K 2 O 0.5-2 parts, CeO 2 0.5-1 parts and Li 2 O 25-28 parts. During the specific preparation, the materials of each component are weighed according to the proportion, and mixed evenly; then melted at 1450-1480°C for 2-5h to obtain a highly uniform molten glass; then eliminate bubbles and streaks for the molten glass, and finally enter the mold It can be formed by internal cooling; among them, ZrO 2 and P 2 O 5 are used as mixed crystal nucleating agents, the former mainly induces the formation of the main crystal phase in the glass system as β-quartz solid solution, and the latter mainly promotes the dissolution of ZrO 2 in the glass, Increase the nucleation rate, and the two promote each other, so as to obtain glass-ceramic with finer grains. The glass-ceramic obtained in this way has high strength, good biocompatibility, and has a wide range of application values.
Description
技术领域technical field
本发明属于生物玻璃材料技术领域，具体涉及一种Li2O- Al2O3- SiO2系统微晶玻璃及其制备方法和应用。The invention belongs to the technical field of biological glass materials, and in particular relates to a Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramic and a preparation method and application thereof.
背景技术Background technique
Li2O- Al2O3- SiO2系统微晶玻璃最主要的特性是热膨胀系数在很大温度范围内可调，也就是说，在很大温度范围内热膨胀系数可以很高、很低甚至为零膨胀系数或负膨胀系数，此外，这类微晶玻璃具有很理想的光学特性，如很好的半透明性或很高的透过率，这些性能使得这类玻璃具有很广泛的应用。该Li2O- Al2O3- SiO2系统微晶玻璃中主要生成二硅酸锂晶体，二硅酸锂晶体具有适宜的热膨胀系数和光折射系数，与玻璃相能够达到良好的热力学和光学匹配，使得二硅酸锂玻璃陶瓷在具备较高机械性能的同时，仍能保持优秀的半透光特性。The most important characteristic of Li 2 O- Al 2 O 3 -SiO 2 system glass-ceramics is that the thermal expansion coefficient can be adjusted in a wide temperature range, that is to say, the thermal expansion coefficient can be very high, very low or even It is zero expansion coefficient or negative expansion coefficient. In addition, this type of glass-ceramics has very ideal optical properties, such as good translucency or high transmittance. These properties make this type of glass widely used. The Li 2 O- Al 2 O 3 -SiO 2 system glass-ceramics mainly produces lithium disilicate crystals, which have suitable thermal expansion coefficients and light refraction coefficients, and can achieve good thermodynamic and optical matching with the glass phase , so that the lithium disilicate glass-ceramic can maintain excellent translucent properties while having high mechanical properties.
在现有的Li2O- Al2O3- SiO2系统微晶中，多采用单独的晶核剂成核，所得到的微晶玻璃晶粒较大，玻璃的强度较低，且玻璃的烧结和析晶质量较差，影响微晶玻璃的一些列性能。In the existing Li 2 O- Al 2 O 3 -SiO 2 system crystallites, a separate crystal nucleating agent is mostly used for nucleation, and the resulting glass-ceramic grains are larger, the strength of the glass is lower, and the glass has a The quality of sintering and crystallization is poor, which affects some properties of glass-ceramics.
发明内容Contents of the invention
本发明的目的提供Li2O- Al2O3- SiO2系统微晶玻璃的制备方法和应用，得到晶粒更细的微晶玻璃。The object of the present invention provides the preparation method and application of Li2O-Al2O3-SiO2 system glass-ceramics, obtains the glass-ceramics with finer crystal grains.
为解决上述技术问题，本发明所采用的技术方案是：一种Li2O- Al2O3- SiO2系统微晶玻璃，包括按氧化物为基准的以重量份计的以下组分：SiO2 58-68份、Al2O3 1-4份、ZrO21-3份、P2O5 0.5-1份、K2O 0.5-2份、CeO2 0.5-1份和Li2O 25-28份。In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramics, including the following components in parts by weight based on oxides: SiO 2 58-68 parts, Al 2 O 3 1-4 parts, ZrO 2 1-3 parts, P 2 O 5 0.5-1 parts, K 2 O 0.5-2 parts, CeO 2 0.5-1 parts and Li 2 O 25 parts -28 servings.
优选的方案中，包括按氧化物为基准的以重量份计的以下组分：SiO2 63份、Al2O33份、ZrO2 3 份、P2O5 1份、K2O 2份、CeO2 0.8份和Li2O 27.2份。In the preferred scheme, the following components are included in parts by weight based on oxides: 63 parts of SiO 2 , 3 parts of Al 2 O 3 , 3 parts of ZrO 2 , 1 part of P 2 O 5 , 2 parts of K 2 O , CeO 2 0.8 parts and Li 2 O 27.2 parts.
进一步地，所述K2O以碳酸盐（K2CO3）形式引入；Li2O以碳酸盐（Li2CO3）形式引入杜绝了KNO3分解所产生的NO、NO2的污染气体；Al2O3以氢氧化物（Al(OH)3）形式引入，有助于原料更好的熔化。Further, the K 2 O is introduced in the form of carbonate (K 2 CO 3 ); the introduction of Li 2 O in the form of carbonate (Li 2 CO 3 ) eliminates the pollution of NO and NO 2 produced by the decomposition of KNO 3 Gas; Al 2 O 3 is introduced in the form of hydroxide (Al(OH) 3 ), which contributes to better melting of raw materials.
制备所述玻璃的方法，包括以下步骤：The method for preparing said glass comprises the following steps:
按照比例称取各组分的物料，混合均匀；然后在1450-1480℃下熔制2-5h，得到高均匀性的玻璃液；再对玻璃液消除气泡和条纹，最后进入模具内冷却成型；得到Li2O- Al2O3-SiO2系统微晶玻璃。Weigh the materials of each component according to the proportion and mix them evenly; then melt at 1450-1480°C for 2-5 hours to obtain a highly uniform molten glass; then eliminate bubbles and streaks for the molten glass, and finally enter the mold for cooling and forming; A Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramic was obtained.
进一步地，所述原料混合时采用V 形混料机，时间为10-30分钟。Further, when the raw materials are mixed, a V-shaped mixer is used for 10-30 minutes.
进一步地，熔制时将混合均匀的原料加入已经升温至1450℃以上的铂金坩埚中，然后置于1450-1480℃下进行熔制；熔制过程中在熔化池底部采用铂金鼓泡器连续不断地向熔化池内鼓泡。Further, during melting, the uniformly mixed raw materials are added to a platinum crucible that has been heated to above 1450°C, and then placed at 1450-1480°C for melting; during the melting process, a platinum bubbler is used at the bottom of the melting pool to continuously bubbling into the melting pool.
本发明还涉及所述的Li2O- Al2O3- SiO2系统微晶玻璃在全瓷美学修复中的应用。The invention also relates to the application of the Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramics in all-ceramic aesthetic restoration.
K2O以K2CO3形式引入，杜绝了KNO3分解所产生的NO、NO2的污染气体。K2O是助溶剂，降低玻璃液的粘度，促进玻璃液的熔化和澄清，还能大大降低玻璃的析晶倾向。K 2 O is introduced in the form of K 2 CO 3 , which eliminates the NO and NO 2 polluting gases produced by the decomposition of KNO 3 . K 2 O is a co-solvent, which reduces the viscosity of the molten glass, promotes the melting and clarification of the molten glass, and can greatly reduce the crystallization tendency of the glass.
Al2O3能够降低玻璃的析晶倾向，提高化学稳定性和机械强度，改善热稳定性。但含量不能太高，否则会增加析晶倾向，并易使玻璃原板上出现波筋等缺陷。Al 2 O 3 can reduce the crystallization tendency of glass, improve chemical stability and mechanical strength, and improve thermal stability. However, the content should not be too high, otherwise it will increase the crystallization tendency and easily cause defects such as ribs on the original glass plate.
ZrO2是中间氧化物，能提高玻璃的粘度、硬度、弹性、折射率、化学稳定性，降低玻璃的热膨胀系数。但含量不能超过有效氧化物组分的6%，否则会导致析晶。ZrO2同时为晶核剂，一般认为先是从母相中析出富含锆氧的结晶，进而诱导母体玻璃成核，在Li2O- Al2O3-SiO2微晶玻璃中，ZrO2主要诱导形成主晶相为β-石英固溶体，次晶相为细颗粒的立方形ZrO2固溶体。ZrO 2 is an intermediate oxide, which can improve the viscosity, hardness, elasticity, refractive index and chemical stability of the glass, and reduce the thermal expansion coefficient of the glass. But the content cannot exceed 6% of the effective oxide component, otherwise it will lead to crystallization. ZrO 2 is also a crystal nucleating agent. It is generally believed that crystals rich in zirconium oxygen are precipitated from the parent phase first, and then induce the nucleation of the mother glass. In Li 2 O- Al 2 O 3 -SiO 2 glass-ceramics, ZrO 2 mainly The induced main crystal phase is β-quartz solid solution, and the secondary crystal phase is fine-grained cubic ZrO 2 solid solution.
P2O5是能形成玻璃网络的氧化物，对硅酸盐玻璃具有良好的成核能力，P2O5使玻璃产生核化作用的原因在于他能促使分相，降低界面能，是成核活化能降低。P 2 O 5 is an oxide that can form a glass network, and has good nucleation ability for silicate glass. The reason why P 2 O 5 can nucleate glass is that it can promote phase separation and reduce interfacial energy. Nuclear activation energy is reduced.
CeO2 可提高玻璃紫外线吸收能力和防暴晒作用，他是一种强氧化剂，在高温下加热可放出氧气，与硝酸盐共用，可起到一定的澄清作用。CeO 2 can improve the glass's UV absorption capacity and anti-exposure effect. It is a strong oxidant that can release oxygen when heated at high temperature. It can play a certain clarification role when it is used together with nitrate.
其中，ZrO2和P2O5作为混合晶核剂。SiO2为形成玻璃的主要组分，并使玻璃具有一系列优良性能，如透明度、机械强度、化学稳定性和热稳定性等。Among them, ZrO 2 and P 2 O 5 are used as mixed crystal nucleating agents. SiO 2 is the main component of glass, and makes glass have a series of excellent properties, such as transparency, mechanical strength, chemical stability and thermal stability, etc.
Li2O是网络外体氧化物，在玻璃中主要为断键作用，助熔作用强烈，是强助熔剂；Li2O可使玻璃的膨胀系数降低，结晶倾向变小，在玻璃中可以降低玻璃熔制温度，提高玻璃质量。Li 2 O is an oxide outside the network. It mainly acts as a bond breaking effect in glass, and has a strong fluxing effect. It is a strong fluxing agent; Li 2 O can reduce the expansion coefficient of glass and the tendency of crystallization. Glass melting temperature, improve glass quality.
Li2O- Al2O3- SiO2系统微晶玻璃最主要的特性是热膨胀系数在很大温度范围内可调，也就是说，在很大温度范围内热膨胀系数可以很高、很低甚至为零膨胀系数或负膨胀系数，此外，这类微晶玻璃具有很理想的光学特性，如很好的半透明性或很高的透过率，这些性能使得这类玻璃具有很广泛的应用。The most important characteristic of Li 2 O- Al 2 O 3 -SiO 2 system glass-ceramics is that the thermal expansion coefficient can be adjusted in a wide temperature range, that is to say, the thermal expansion coefficient can be very high, very low or even It is zero expansion coefficient or negative expansion coefficient. In addition, this type of glass-ceramics has very ideal optical properties, such as good translucency or high transmittance. These properties make this type of glass widely used.
该Li2O- Al2O3- SiO2系统微晶玻璃中主要生成二硅酸锂晶体，二硅酸锂晶体具有适宜的热膨胀系数和光折射系数，与玻璃相能够达到良好的热力学和光学匹配，使得二硅酸锂玻璃陶瓷在具备较高机械性能的同时，仍能保持优秀的半透光特性，实现了高强度和美学效果的统一，在全瓷美学修复领域具有广阔的应用前景。The Li 2 O- Al 2 O 3 -SiO 2 system glass-ceramics mainly produces lithium disilicate crystals, which have suitable thermal expansion coefficients and light refraction coefficients, and can achieve good thermodynamic and optical matching with the glass phase , so that lithium disilicate glass-ceramics can maintain excellent translucent properties while having high mechanical properties, and realize the unity of high strength and aesthetic effect, and have broad application prospects in the field of all-ceramic aesthetic restoration.
本发明的有益效果如下：The beneficial effects of the present invention are as follows:
1、以ZrO2和P2O5作为混合晶核剂，前者在玻璃系统中主要诱导形成主晶相为β-石英固溶体，后者主要促进ZrO2在玻璃中的溶解，提高成核速率，二者相互促进，从而得到晶粒更细的微晶玻璃，对于微晶玻璃的各项性能改善较为明显，提高了微晶玻璃的质量1. Use ZrO 2 and P 2 O 5 as mixed crystal nucleating agents. The former mainly induces the formation of the main crystal phase as β-quartz solid solution in the glass system, and the latter mainly promotes the dissolution of ZrO 2 in the glass and increases the nucleation rate. The two promote each other, so as to obtain glass-ceramics with finer grains, which improves the performance of glass-ceramics more obviously, and improves the quality of glass-ceramics
2、通过对ZrO2和P2O5加入比例和其他物流成分比例、制备方法工艺参数进行了控制，制备出的Li2O- Al2O3- SiO2系统微晶玻璃强度高，生物相容性好，具有很高的应用价值。2. By controlling the addition ratio of ZrO 2 and P 2 O 5 , the ratio of other logistics components, and the process parameters of the preparation method, the prepared Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramic has high strength and biophase Good capacitance and high application value.
具体实施方式detailed description
下面结合具体实施例，进一步阐明本发明。这些实施例应理解为仅用于说明本发明而不是用于限制本发明的保护范围。在阅读了本发明记载的内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等效变化和修饰同样落入本发明权利要求书所限定的范围。Below in conjunction with specific embodiment, further illustrate the present invention. These examples should be understood as only for illustrating the present invention but not for limiting the protection scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent changes and modifications also fall within the scope defined by the claims of the present invention.
实施例1Example 1
一种Li2O- Al2O3- SiO2系统微晶玻璃，包括按氧化物为基准的以重量份计的以下组分：A Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramic, comprising the following components in parts by weight based on oxides:
SiO2 63份；SiO 2 63 parts;
Al2O3 3份；Al 2 O 3 3 parts;
ZrO2 3 份； 3 parts of ZrO2;
P2O5 1份；P 2 O 5 1 part;
K2O 2份；K 2 O 2 parts;
CeO2 0.8份；0.8 parts of CeO2 ;
Li2O 27.2份。Li 2 O 27.2 parts.
实施例2Example 2
一种Li2O- Al2O3- SiO2系统微晶玻璃，包括按氧化物为基准的以重量份计的以下组分：A Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramic, comprising the following components in parts by weight based on oxides:
SiO2 65份；SiO 2 65 parts;
Al2O3 2份；Al 2 O 3 2 parts;
ZrO2 3份； 3 parts of ZrO2;
P2O5 1份；P 2 O 5 1 part;
K2O 2份；K 2 O 2 parts;
CeO2 0.5份； 0.5 parts of CeO2;
Li2O 26.5份Li 2 O 26.5 parts
实施例3Example 3
一种Li2O- Al2O3- SiO2系统微晶玻璃，包括按氧化物为基准的以重量份计的以下组分：A Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramic, comprising the following components in parts by weight based on oxides:
SiO2 65份；SiO 2 65 parts;
Al2O3 4份；Al 2 O 3 4 parts;
ZrO2 1.5份；1.5 parts of ZrO2 ;
P2O5 0.8份；P 2 O 5 0.8 parts;
K2O 2份；K 2 O 2 parts;
CeO2 1份；CeO2 1 part;
Li2O 25.7份。Li 2 O 25.7 parts.
实施例4Example 4
一种Li2O- Al2O3- SiO2系统微晶玻璃，包括按氧化物为基准的以重量份计的以下组分：A Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramic, comprising the following components in parts by weight based on oxides:
SiO2 61份；SiO 2 61 parts;
Al2O3 4份；Al 2 O 3 4 parts;
ZrO2 3份； 3 parts of ZrO2;
P2O5 1份；P 2 O 5 1 part;
K2O 2份；K 2 O 2 parts;
CeO2 1份；CeO2 1 part;
Li2O 28份。Li 2 O 28 parts.
实施例5Example 5
一种Li2O- Al2O3- SiO2系统微晶玻璃，包括按氧化物为基准的以重量份计的以下组分：A Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramic, comprising the following components in parts by weight based on oxides:
SiO2 68份；SiO 2 68 parts;
Al2O3 2份；Al 2 O 3 2 parts;
ZrO2 1份； 1 part of ZrO2;
P2O5 1份；P 2 O 5 1 part;
K2O 2份；K 2 O 2 parts;
CeO2 1份；CeO2 1 part;
Li2O 25份。Li 2 O 25 parts.
以上实施例中，K2O以碳酸盐（K2CO3）形式引入；Li2O以碳酸盐（Li2CO3）形式引入；Al2O3以氢氧化物（Al(OH)3）形式引入。In the above examples, K 2 O is introduced in the form of carbonate (K 2 CO 3 ); Li 2 O is introduced in the form of carbonate (Li 2 CO 3 ); Al 2 O 3 is introduced in the form of hydroxide (Al(OH) 3 ) Form introduction.
对比例1：具体为按氧化物为基准的以重量份计的以下组分：SiO2 63份、Al2O3 3份、ZrO2 0份、P2O5 1份、K2O 2份、CeO2 0.8份和Li2O 27.2份。Comparative example 1: specifically the following components in parts by weight based on oxides: 63 parts of SiO 2 , 3 parts of Al 2 O 3 , 0 parts of ZrO 2 , 1 part of P 2 O 5 , 2 parts of K 2 O , CeO 2 0.8 parts and Li 2 O 27.2 parts.
对比例2：具体为按氧化物为基准的以重量份计的以下组分：SiO2 63份、Al2O3 3份、ZrO2 3份、P2O5 0份、K2O 2份、CeO2 0.8份和Li2O 27.2份。Comparative example 2: specifically the following components in parts by weight based on oxides: SiO 2 63 parts, Al 2 O 3 3 parts, ZrO 2 3 parts, P 2 O 5 0 parts, K 2 O 2 parts , CeO 2 0.8 parts and Li 2 O 27.2 parts.
以上微晶玻璃的具体制备方法，包括步骤如下：The concrete preparation method of above glass-ceramic comprises steps as follows:
1）按照比例称取各组分的物料，用 V 形混料机将各组分原料混合，混合时间为20分钟，得到混合均匀的原料；1) Weigh the materials of each component according to the proportion, and mix the raw materials of each component with a V-shaped mixer. The mixing time is 20 minutes to obtain uniformly mixed raw materials;
2）将所述步骤1）混合均匀的原料加入到已经升温至1450℃以上的铂金坩埚中，在1450℃下熔制2 h，熔制过程中熔化池底部的铂金鼓泡器连续不断地向熔化池内鼓泡，将熔化池内的玻璃混合均匀，得到高均匀性的玻璃液；2) Add the homogeneously mixed raw materials in step 1) into a platinum crucible that has been heated to above 1450°C, and melt at 1450°C for 2 hours. During the melting process, the platinum bubbler at the bottom of the melting pool continuously Bubbling in the melting pool, mixing the glass in the melting pool evenly to obtain highly uniform molten glass;
3）所述步骤2）的玻璃液通过熔化池后壁底部的熔化池放料管流入后端的铂金器皿内进行消除气泡和条纹，得到消除气泡和条纹的玻璃液；3) The molten glass in step 2) flows into the platinum vessel at the rear end through the discharge pipe of the melting pool at the bottom of the rear wall of the melting pool to eliminate bubbles and streaks, and obtain glass molten glass that eliminates bubbles and streaks;
4）所述步骤3）消除气泡和条纹的玻璃液经过铂金直接通电加热的出料管，进入到成型模具内冷却；得到Li2O- Al2O3- SiO2系统微晶玻璃。4) The glass liquid in step 3) where bubbles and streaks have been eliminated passes through a discharge pipe directly heated by platinum, and enters a forming mold for cooling; Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramic is obtained.
将对比例1、2和实施例1制得的样品进行包括挠曲强度、化学溶解性、膨胀系数、转变温度和硬度（努式）在内的性能测试测试，结果如表1所示：The samples prepared in Comparative Examples 1, 2 and Example 1 were subjected to performance tests including flexural strength, chemical solubility, expansion coefficient, transition temperature and hardness (Knoop), and the results are shown in Table 1:
表1各样品的性能测试数据The performance test data of each sample in table 1
对比例1和对比例2中，分别使用P2O5和ZrO2为晶核剂，对比例1中没有添加ZrO2，对比例2中没有添加P2O5。与P2O5相比，ZrO2原料的密度大，折射率高，对于提高玻璃强度效果明显。由表1可知，采用ZrO2为单独晶核剂的对比例2样品的挠曲强度、转变温度、密度和折射率数值均高于P2O5为单独晶核剂的对比例1的样品，而热膨胀系数低于对比例1的样品。In Comparative Example 1 and Comparative Example 2, P 2 O 5 and ZrO 2 were respectively used as crystal nucleating agents, ZrO 2 was not added in Comparative Example 1, and P 2 O 5 was not added in Comparative Example 2. Compared with P 2 O 5 , ZrO 2 raw material has a higher density and a higher refractive index, which has an obvious effect on improving the strength of glass. As can be seen from Table 1, the flexural strength, transition temperature, density and refractive index values of the sample of Comparative Example 2 using ZrO as a separate crystal nucleating agent are all higher than P 2 O 5 is the sample of Comparative Example 1 of a separate crystal nucleating agent, However, the coefficient of thermal expansion is lower than that of the sample of Comparative Example 1.
实施例1中，采用ZrO2 和P2O5为晶核剂，样品的性能数据与两种原料对于对于玻璃性质的影响相符合，前者在玻璃系统中主要诱导形成主晶相为β-石英固溶体，后者主要促进ZrO2在玻璃中的溶解，提高成核速率，二者相互促进，得到一种Li2O- Al2O3- SiO2系统微晶玻璃。In Example 1, ZrO 2 and P 2 O 5 are used as crystal nucleating agents. The performance data of the sample is consistent with the influence of the two raw materials on the properties of the glass. The former mainly induces the formation of β-quartz as the main crystal phase in the glass system. The latter mainly promotes the dissolution of ZrO 2 in the glass and increases the nucleation rate, and the two promote each other to obtain a Li 2 O-Al 2 O 3 -SiO 2 system glass-ceramics.
上述的实施例仅为本发明的优选技术方案，而不应视为对于本发明的限制，本申请中的实施例及实施例中的特征在不冲突的情况下，可以相互任意组合。本发明的保护范围应以权利要求记载的技术方案，包括权利要求记载的技术方案中技术特征的等同替换方案为保护范围。即在此范围内的等同替换改进，也在本发明的保护范围之内。The above-mentioned embodiments are only preferred technical solutions of the present invention, and should not be regarded as limitations on the present invention. The embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other if there is no conflict. The scope of protection of the present invention shall be the technical solution described in the claims, including equivalent replacements for the technical features in the technical solution described in the claims. That is, equivalent replacement and improvement within this range are also within the protection scope of the present invention.
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