CN115594486A - Preparation method of low-expansion cordierite heat-resistant purple sand ceramic and product prepared by preparation method - Google Patents
Preparation method of low-expansion cordierite heat-resistant purple sand ceramic and product prepared by preparation method Download PDFInfo
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Abstract
The invention discloses a preparation method of low-expansion cordierite heat-resistant purple sand ceramic and a product prepared by the method. The invention also aims to provide a product prepared by the preparation method of the low-expansion cordierite heat-resistant purple sand ceramic. The cordierite heat-resistant purple sand ceramic has good stability, and the obtained ceramic material has good mechanical property and low thermal expansion coefficient, not only has the advantage of low cost, but also can provide necessary conditions for the low-expansion heat-resistant purple sand ceramic matched with electric appliances based on the production process of general daily ceramics, is beneficial to realizing industrial upgrading, and has a promoting effect on the technical progress and application development of the low-expansion ceramic industry.
Description
Technical Field
The invention relates to the technical field of ceramics, in particular to a preparation method of low-expansion cordierite heat-resistant purple sand ceramic and a product prepared by the same.
Background
The purple sand is rich in iron and also contains various microelements required by a human body, can decompose fat in food, can emit far infrared rays in the heating process, is beneficial to the formation of weak alkaline health of the human body and has the function of activating lipase; the prepared food is soft and delicious but not greasy, and can play a role in keeping food fresh, thereby having the efficacies of health care and disease prevention. Because of the particularity of the structure and the composition of the purple sand cooker, the prepared food has clear taste and comprehensive and rich nutrition, is more practical, sanitary and safe than common electric cookers and other products. Therefore, the purple sand ceramics are very popular with consumers. However, the existing purple sand ceramics have the defects of high thermal expansion coefficient, low strength and safety and the like, and cannot meet the fast-paced life style of people at present. In order to reduce the thermal expansion coefficient, a low expansion ceramic material is generally obtained by adding a low expansion raw material such as spodumene, but since the spodumene raw material is favored by the lithium ion battery energy industry, the price cost thereof is greatly increased and the resource thereof is short. Accordingly, cordierite low-expansion ceramic materials have become one of the concerns of researchers. If the heat-resistant purple sand ceramic with cordierite crystal phase can be prepared, the low expansion characteristic and the mechanical property of the product are improved, the product has good stability, and the health care function is realized, and necessary conditions are provided for matching with novel cooking electric appliances (an electric ceramic furnace, an IH heating electric cooker, an induction cooker, an electric flame stove and the like), so that the market and industry upgrading are facilitated to be expanded.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a preparation method of low-expansion cordierite heat-resistant purple sand ceramic. The invention also aims to provide a product prepared by the preparation method of the low-expansion cordierite heat-resistant purple sand ceramic.
The purpose of the invention is realized by the following technical scheme:
the invention provides a preparation method of low-expansion cordierite heat-resistant purple sand ceramic, which comprises the following raw materials of 27-30 wt% of Guizhou soil, 35-41 wt% of cordierite accelerant, 24-32 wt% of purple sand soil and 5-10 wt% of black mud; the raw material composition of the cordierite accelerant is hectorite 39.20-41.38 wt%, talc 48.28-50.64%, alumina 4.18-4.59% and ferric oxide 3.52-5.75%;
the preparation method comprises the following steps:
adding the raw material composition of the cordierite accelerator into a ball mill for primary mixing ball milling, then adding the rest raw material composition of the purple sand ceramics for secondary mixing ball milling mixing, and ageing and forming to obtain a blank; and calcining the green body under the condition of oxidizing atmosphere at the firing temperature of 1230-1300 ℃ for 30-60 min to obtain the low-expansion cordierite heat-resistant purple sand ceramic.
Furthermore, the chemical composition of the cordierite accelerator is SiO 2 52.61～52.68％、Al 2 O 3 14.03～14.20％、CaO 0.41～0.45％、MgO 15.63～15.85％、Li 2 O 1.99～2.01％、Fe 2 O 3 5.73～5.89％、K 2 O 3.40～3.56％、Na 2 O 0.70～0.76％、P 2 O 5 2.10-2.34% and IL 3.16-3.24%. The chemical composition of the purple sandy soil is SiO 2 49.96～50.03％、Al 2 O 3 16.24～16.46％、CaO 0.22～0.25％、MgO 0.52～0.79％、Fe 2 O 3 18.84～19.04％、FeO 0.26～0.29％、K 2 O 2.67～2.87％、Na 2 O 0.11～0.13％、MnO 0.01～0.02％、IL 10.80～11.20％。
Furthermore, the fineness of the primary mixed ball milling is 0.1-0.15% of the residue of a 250-mesh sieve. The time of the secondary mixing and ball milling is 20-30 min. The molding is plastic molding, slip casting or dry pressing.
The product prepared by the preparation method of the low-expansion cordierite heat-resistant purple sand ceramic is composed of an aggregation rod-shaped cross network structure, wherein the radial size of the aggregation rod-shaped cross network structure is 30-300 nm. The thermal expansion coefficient of the low-expansion cordierite heat-resistant purple sand ceramic is 2.013-2.117 multiplied by 10 -6 The temperature is 43.44-45.68 MPa, the breaking strength is 1.08-1.29%.
The invention has the following beneficial effects:
(1) According to the invention, through optimizing the formula design, the introduced cordierite accelerant can ensure the low expansion performance of the purple sand ceramic, improve the thermal stability of the low expansion heat-resistant ceramic, and has wide firing temperature range, thereby facilitating firing; the introduced cordierite accelerant can increase the viscosity of a liquid phase in the green body, is beneficial to forming a rodlike cordierite crystalline phase with the radial dimension of 30-300 nm, has low thermal expansion performance, and has a crossed network structure, so that the heat-resistant purple sand ceramic has good bending strength, and the problems of soft collapse deformation and the like of the green body are prevented. Therefore, the formula system of the invention expands the firing range of cordierite ceramics under the condition of oxidizing atmosphere, not only ensures the product quality, but also reduces the production cost of low-expansion ceramic materials, and meanwhile, the purple sand ceramics have the health-care function and well meet the daily health-care requirement.
(2) The cordierite heat-resistant purple sand ceramic has good stability, the obtained ceramic material has good mechanical property and low thermal expansion coefficient, not only has the advantage of low cost, but also provides necessary conditions for low-expansion heat-resistant purple sand ceramic matched with novel electric appliances (an electric ceramic furnace, an IH heating electric cooker, an induction cooker, an electric flame stove and the like) based on the production process of general daily ceramics, is beneficial to realizing industrial upgrading, and has a promoting effect on technical progress and application development of the low-expansion ceramic industry.
Drawings
The invention will now be described in further detail with reference to the following examples and the accompanying drawings:
FIG. 1 is an XRD diffractogram of a low-expansion cordierite heat-resistant purple sand ceramic produced according to an embodiment of the present invention;
FIG. 2 is a scanning electron microscope image of a low-expansion cordierite heat-resistant purple sand ceramic prepared according to an example of the present invention.
Detailed Description
The embodiment of the invention relates to a preparation method of low-expansion cordierite heat-resistant purple sand ceramic, which comprises the following raw materials of 27-30 wt% of Guizhou soil, 35-41 wt% of cordierite accelerant, 24-32 wt% of purple sand and 5-10 wt% of black mud.
The raw material composition of each example is shown in table 1.
TABLE 1 composition of raw materials (wt%) of cordierite heat-resistant purple sand ceramics according to examples of the present invention
Wherein, the raw material composition of the cordierite accelerant is 41.38wt% of raw spodumene, 48.28wt% of talcum, 4.59wt% of alumina and 5.75wt% of ferric oxide, and the chemical composition is SiO 2 52.64％、Al 2 O 3 14.13％、CaO 0.42％、MgO 15.63％、Li 2 O 1.99％、Fe 2 O 3 5.75％、K 2 O 3.40％、Na 2 O 0.70％、P 2 O 5 2.16% and IL 3.18%. The chemical composition of the purple sandy soil is SiO 2 49.96％、Al 2 O 3 16.24％、CaO 0.22％、MgO 0.77％、 Fe 2 O 3 18.96％、FeO 0.26％、K 2 O 2.67％、Na 2 O 0.11％、MnO 0.01％、IL 10.80％；
The preparation method comprises the following steps:
adding the raw materials of the cordierite accelerant into a ball mill, carrying out primary mixing ball milling until the fineness is 0.1-0.15% of the screen residue with 250 meshes, then adding the rest raw materials of the purple sand ceramics, carrying out secondary mixing ball milling for 20-30 min, and carrying out ageing and forming to obtain a blank; the green body is calcined under the condition of oxidizing atmosphere at the firing temperature of 1230-1300 ℃ and the heat preservation time of 30-60 min to obtain the low-expansion cordierite heat-resistant purple sand ceramic. The process parameters of the preparation method of each example are shown in table 2.
TABLE 2 preparation method of cordierite heat-resistant purple sand ceramics according to various embodiments of the present invention
As shown in FIG. 1, the crystalline phase of the low-expansion cordierite heat-resistant purple sand ceramic prepared by the embodiment of the invention is cordierite crystalline phase, and is consistent with standard diffraction peak card (PDF # 12-0303); as shown in FIG. 2, the heat-resistant purple sand ceramic is composed of a gathered rod-shaped cross network structure, wherein the radial dimension of the gathered rod shape is 30-300 nm. The performance indexes of the prepared cordierite heat-resistant purple sand ceramic are shown in Table 3.
TABLE 3 Performance index of the low-expansion cordierite heat-resistant purple sand ceramics prepared by the embodiment of the invention
Claims (9)
1. A preparation method of low-expansion cordierite heat-resistant purple sand ceramic is characterized by comprising the following steps: the raw materials of the cordierite heat-resistant purple sand ceramic comprise 27-30 wt% of Guizhou soil, 35-41 wt% of cordierite accelerant, 24-32 wt% of purple sand soil and 5-10 wt% of black mud; the raw material composition of the cordierite accelerant is raw spodumene 39.20-41.38 wt%, talcum 48.28-50.64 wt%, alumina 4.18-4.59 wt% and ferric oxide 3.52-5.75 wt%; the preparation method comprises the following steps:
adding the raw material composition of the cordierite accelerator into a ball mill for primary mixing ball milling, then adding the rest raw material composition of the purple sand ceramics for secondary mixing ball milling, and ageing and forming to obtain a blank; and calcining the green body under the condition of oxidizing atmosphere at the firing temperature of 1230-1300 ℃ for 30-60 min to obtain the low-expansion cordierite heat-resistant purple sand ceramic.
2. The preparation method of the low-expansion cordierite heat-resistant purple sand ceramic according to claim 1, wherein the preparation method comprises the following steps: the chemical composition of the cordierite accelerant is SiO 2 52.61～52.68％、Al 2 O 3 14.03～14.20％、CaO 0.41～0.45％、MgO 15.63～15.85％、Li 2 O 1.99～2.01％、Fe 2 O 3 5.73～5.89％、K 2 O 3.40～3.56％、Na 2 O 0.70～0.76％、P 2 O 5 2.10～2.34％、IL 3.16～3.24％。
3. The method for preparing the low-expansion cordierite heat-resistant purple sand ceramic according to claim 1, wherein the method comprises the following steps: the chemical composition of the purple sandy soil is SiO 2 49.96～50.03％、Al 2 O 3 16.24～16.46％、CaO 0.22～0.25％、MgO 0.52～0.79％、Fe 2 O 3 18.84～19.04％、FeO 0.26～0.29％、K 2 O 2.67～2.87％、Na 2 O 0.11～0.13％、MnO 0.01～0.02％、IL 10.80～11.20％。
4. The method for preparing the low-expansion cordierite heat-resistant purple sand ceramic according to claim 1, wherein the method comprises the following steps: the fineness of the primary mixing ball milling is 0.1-0.15% of the residue of a 250-mesh sieve.
5. The method for preparing the low-expansion cordierite heat-resistant purple sand ceramic according to claim 1, wherein the method comprises the following steps: the time of the secondary mixing ball milling is 20-30 min.
6. The method for preparing the low-expansion cordierite heat-resistant purple sand ceramic according to claim 1, wherein the method comprises the following steps: the molding is plastic molding, slip casting or dry pressing.
7. The product prepared by the method for preparing the low-expansion cordierite heat-resistant purple sand ceramic in the claims 1-6.
8. The product of claim 7, wherein: the low-expansion cordierite heat-resistant purple sand ceramic is composed of an aggregation rod-shaped cross network structure, wherein the radial size of the aggregation rod-shaped cross network structure is 30-300 nm.
9. The product according to claim 7 or 8, characterized in that: the thermal expansion coefficient of the low-expansion cordierite heat-resistant purple sand ceramic is 2.013-2.117 multiplied by 10 -6 The temperature is 43.44-45.68 MPa, the breaking strength is 1.08-1.29%.
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