A method for in-situ synthesis of ZrC-reinforced ZTA composite ceramics

Abstract

A method for in-situ synthesis of ZrC reinforced ZTA composite ceramics, which relates to a method for synthesizing composite ceramics. The purpose of the present invention is to solve the problem that the existing use of third-phase particles to reinforce ZTA ceramics in the form of solid-phase carbide particles is difficult to disperse evenly, and ZTA composite ceramics with high hardness, high strength, high toughness and high wear resistance cannot be obtained. Method: 1. Prepare slurry; 2. Spray drying; 3. Pressing and forming; 4. Sintering to obtain ZrC reinforced ZTA composite ceramics. The density of the ZrC reinforced ZTA composite ceramics prepared by the present invention is adjustable, that is, the density is adjustable and the cost is controllable; the composite ceramics, based on traditional zirconia toughening, utilize a multi-element synergistic strengthening mechanism to synthesize zirconium carbide in situ, and utilize the high hardness of zirconium carbide and the dispersion toughening of zirconium carbide particles to further toughen and strengthen the zirconium-aluminum composite ceramics, so that its hardness and toughness are higher than those of conventional ZTA, and its wear resistance is better.

Description

Technical Field

[0001] The invention relates to a method for synthesizing multiphase ceramics. Background Art

[0002] Alumina ceramics offer advantages such as high hardness, high temperature resistance, corrosion resistance, and wear resistance. However, their brittleness significantly limits their widespread application, especially under high-speed or high-load impacts, where their wear resistance plummets and can even directly cause structural damage. ZTA is a new composite material with Al2O3 as the matrix and partially stabilized ZrO2 as the reinforcing and toughening phase. Research has shown that the mechanical properties of ZTA ceramics lie between those of Al2O3 and ZrO2, combining the high toughness and strength of ZrO2 ceramics with the high hardness of Al2O3 ceramics. However, the cost of zirconium oxide has continued to rise in the past two years, and zirconium oxide itself has a relatively low hardness. As the zirconium oxide content increases, the hardness of the material system decreases, and wear resistance also decreases.

[0003] ZrO2 phase transformation toughening improves the brittleness of Al2O3 to a certain extent, and Al2O3 composite ceramics also exhibit better mechanical and thermal properties than single-phase Al2O3. However, the comprehensive performance of this single-phase strengthened and toughened ZTA composite ceramic still cannot meet the needs of many specialized industries. For example, the underflow of ceramic cyclones suffers from severe erosion and collision, resulting in a significantly shorter service life than the ceramic lining of the cylinder. To further improve the mechanical properties (especially fracture toughness) of ZTA, the addition of whiskers or nanoparticles to ZTA ceramics for toughening has been considered. However, the high cost of whisker and nanoparticle toughening technologies, the difficulty in producing dispersed materials, and the relatively complex preparation process make it difficult to achieve competitive industrial products. However, by introducing a third phase such as TiC or ZrC to achieve heterogeneous particle dispersion toughening combined with zirconia phase transformation toughening, the synergistic effect of multiple toughening mechanisms can further improve the toughness of ZTA, improve its wear resistance, and improve its thermal and mechanical properties.

[0004] Zhang XP et al. prepared SiC / ZTA composite ceramics with a high temperature (1000°C) flexural strength of 518 MPa by hot pressing sintering, which is much stronger than ZTA ceramics (Zhang XP, Ouyang JH, Wang YJ, et al. Journal of Materials Engineering and Performance, 2015, 24(9): 3615-21). Chai et al. prepared SiC / ZTA composite materials by SPS and found that the improvement in SiC / ZTA flexural strength was mainly caused by grain boundary strengthening after adding SiC particles, changes in transgranular / intergranular fracture modes, and crack offset and bridging (Chai J, Zhu Y, Wang Z, et al. Materials Science and Engineering: A, 2020, 781: 139197.). Grigoriev et al. studied the effect of TiC content on the microstructure and mechanical properties of TiC / ZTA composite ceramics and found that the improvement in toughness after TiC addition was primarily related to the ability of TiC grains to dissipate crack propagation energy through crack deflection (Grigoriev M, Kotelnikov N, Buyakova S, et al. IOP Conference Series: Materials Science and Engineering, 2016, 116:01-2002). The aforementioned references all achieved varying degrees of improvement in material properties using third-phase particles, but all were introduced in the form of solid-phase carbide particles. This method makes it difficult to ensure uniform mixing of the introduced carbide particles, which inevitably affects performance. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the existing use of third-phase particles to reinforce ZTA ceramics in the form of solid-phase carbide particles is difficult to disperse evenly and cannot obtain ZTA composite ceramics with high hardness, high strength, high toughness and high wear resistance, and to provide a method for in-situ synthesis of ZrC reinforced ZTA composite ceramics.

[0006] The present invention uses sugar compounds as carbon source materials and adopts an in-situ synthesis process to directly prepare ZrC-reinforced ZTA composite ceramics; after the sugar compounds are dissolved in water, they form a sugar solution that can fully contact with the reactants. The formed sugar-carbon reaction is highly active and can significantly reduce the reaction synthesis temperature, achieving the effect of energy conservation and emission reduction.

[0007] A method for in-situ synthesis of ZrC reinforced ZTA composite ceramics is specifically completed by the following steps:

[0008] 1. Prepare slurry:

[0009] Alumina powder, zirconium oxide powder and sintering aid are used as raw materials, and an aqueous solution of a saccharide compound is used as a solvent. A stirred mill connected in series with a sand mill is used in combination with a ball milling process to form a high solid content slurry.

[0010] 2. Spray granulate the high solid content slurry to obtain spherical particle powder;

[0011] 3. In a cold isostatic pressing machine, the spherical particle powder is pressed into shape to form a ceramic green body;

[0012] 4. Sintering the ceramic green body in a vacuum furnace to obtain ZrC reinforced ZTA composite ceramics.

[0013] Principle of the present invention:

[0014] 1. The present invention provides a method for preparing a ZrC-reinforced ZTA composite ceramic with high hardness, high strength, high toughness, high wear resistance and adjustable density; the adjustable density can be controlled by the zirconium content, that is, the density can be adjusted and the cost can be controlled; based on traditional zirconia toughening, the composite ceramic utilizes a multi-element synergistic strengthening mechanism to in-situ synthesize zirconium carbide, and utilizes the high hardness (26GPa) of zirconium carbide and the dispersion toughening of zirconium carbide particles to further toughen and strengthen the zirconium-aluminum composite ceramic, so that its hardness and toughness are higher than those of conventional ZTA, and its wear resistance is better.

[0015] Second, the process of the present invention is simple to prepare and compatible with existing production processes and equipment. The ZrC formed can be mixed evenly with α-Al2O3 and t-ZrO2 with great probability. Three types of grain boundaries exist within ZrC-reinforced ZTA composite ceramics: Al2O3 / ZrO2, ZrC / ZrO2, and Al2O3 / ZrC. Compressive stress or tensile force forms at the grain boundaries due to the mismatch in elastic modulus and thermal expansion between the two phases. Tensile force induces crack deflection, while compressive stress forces cracks to undergo transgranular fracture. Therefore, utilizing multi-element synergistic coupling can further improve product strength and toughness and inhibit grain growth. Furthermore, the in-situ synthesized ZrC easily forms intracrystalline zirconium carbide, creating a secondary interface between the intracrystalline phase and the matrix grains. This weakens the effect of cracks on the primary grain boundaries, thereby inducing transgranular fracture and pinning dislocations during the fracture process.

[0016] The present invention has the following beneficial effects:

[0017] 1. The carbon source is introduced in the form of sugar compounds and mixed with ZTA slurry in the form of sugar compound aqueous solution and ball milled. The reactants are extremely refined and homogenized, which not only solves the problem of uneven mixing in solid-phase carbon reduction reaction, but also reduces production costs. At the same time, the carbon formed after the cracking of sugar compounds has high reaction activity, which can reduce the reaction temperature of carbothermal reduction synthesis by more than 100°C compared with solid carbon methods such as carbon black, thereby optimizing production costs.

[0018] 2. The present invention uses corundum phase, zirconium carbide phase, and tetragonal zirconia phase as the main crystal phases to form a multiple grain boundary structure. This grain boundary structure can mutually inhibit grain growth, thereby refining grains and improving wear resistance. At the same time, the introduction of zirconium carbide can strengthen grain boundaries, induce crack deflection or bridging, and the change in fracture mode is conducive to improving the fracture toughness of the material.

[0019] 3. This invention utilizes composite rare earth oxides in conjunction with a CMAS liquid phase to promote ceramic sintering. Due to the inherent limitations of its glassy structure, CMAS sintering aids alone generally have low strength and cannot achieve both low-temperature sintering and high product strength. Rare earths, due to their unique electronic structure, are excellent surface active elements, reducing liquid phase viscosity, improving wettability with alumina / zirconia / zirconium carbide grains, lowering firing temperatures, and broadening the firing range.

[0020] 4. The introduction of zirconium carbide in the form of in-situ reaction synthesis is lower in cost than directly introducing zirconium carbide powder. At the same time, the introduction of zirconium carbide can not only strengthen the grain boundaries and refine the grains, but also further improve the hardness and toughness of ZTA;

[0021] 5. The volume density of ZrC reinforced ZTA composite ceramics prepared by the present invention is from 4.0 g / cm 3 ~5.0g / cm 3 Adjustable. Compared with ZTA ceramics with the same zirconium content, it has higher hardness and toughness, better wear resistance, and can be used in the preparation of easily-worn ceramic cyclone bottom flow ports, impact-resistant ceramic vulcanized plates, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The X-ray diffraction pattern of the ZrC reinforced ZTA composite ceramic prepared in Example 1;

[0023] Figure 2 This is a scanning electron photograph of the ZrC-reinforced ZTA composite ceramic prepared in Example 1, magnified 2000 times;

[0024] Figure 3 This is a scanning electron photograph of the ZrC-reinforced ZTA composite ceramic prepared in Example 2, magnified 5000 times;

[0025] Figure 4 This is a scanning electron photograph of the ZTA ceramic prepared in Comparative Example 3 magnified 2000 times;

[0026] Figure 5 This is a scanning electron photograph of the ZrC reinforced ZTA composite ceramic prepared in Comparative Example 2, magnified 1000 times. DETAILED DESCRIPTION

[0027] Specific embodiment 1: This embodiment provides a method for in-situ synthesis of ZrC reinforced ZTA composite ceramics, which is specifically completed by the following steps:

[0028] 1. Prepare slurry:

[0029] Alumina powder, zirconium oxide powder and sintering aid are used as raw materials, and an aqueous solution of a saccharide compound is used as a solvent. A stirred mill connected in series with a sand mill is used in combination with a ball milling process to form a high solid content slurry.

[0030] 2. Spray granulate the high solid content slurry to obtain spherical particle powder;

[0031] 3. In a cold isostatic pressing machine, the spherical particle powder is pressed into shape to form a ceramic green body;

[0032] 4. Sintering the ceramic green body in a vacuum furnace to obtain ZrC reinforced ZTA composite ceramics.

[0033] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that the mass ratio of alumina powder, zirconium oxide powder, and sintering aid in step 1 is (20-80):(10-70):(0-5). The other steps are the same as specific embodiment 1.

[0034] Specific embodiment 3: This embodiment differs from specific embodiments 1 or 2 in that the sintering aids described in step 1 are light calcium, talc, Suzhou clay, lanthanum oxide, and cerium oxide in a mass ratio of (0.1-1):(0.1-1):(1-3):(0.1-1):(0.1-1). The other steps are the same as specific embodiments 1 or 2.

[0035] Specific embodiment 4: This embodiment differs from specific embodiments 1 to 3 in that the aqueous solution of the carbohydrate compound in step 1 is a sucrose aqueous solution, a glucose aqueous solution, or a fructose aqueous solution. The other steps are the same as those of specific embodiments 1 to 3.

[0036] Specific embodiment 5: This embodiment differs from specific embodiments 1 to 4 in that the median particle size D50 of the zirconium oxide powder in step 1 is not greater than 1.0 μm. The other steps are the same as those of specific embodiments 1 to 4.

[0037] Specific embodiment 6: This embodiment differs from specific embodiments 1 to 5 in that the median particle size D50 of the slurry in step 1 is 0.8 μm to 1.5 μm, and the solid content of the slurry is 60% to 65%. The other steps are the same as specific embodiments 1 to 5.

[0038] Specific embodiment 7: This embodiment differs from specific embodiments 1 to 6 in that the particle size of the spherical granular powder in step 2 is 30-200 mesh. The other steps are the same as those of specific embodiments 1 to 6.

[0039] Specific embodiment 8: This embodiment differs from specific embodiments 1 to 7 in that the molding pressure in step 3 is 100 MPa to 200 MPa. The other steps are the same as those in specific embodiments 1 to 7.

[0040] Specific Embodiment 9: This embodiment differs from Specific Embodiments 1 to 8 in that the mass fraction of ZrC in the ZrC-reinforced ZTA composite ceramic described in Step 4 is 5% to 10%, and the molar ratio of C to ZrC produced by carbonization of the saccharide compound described in Step 1 is (3.5-4):1. The remaining steps are the same as Specific Embodiments 1 to 8.

[0041] Specific embodiment 10: This embodiment differs from specific embodiments 1 to 9 in that the sintering temperature in step 4 is 1550° C. to 1650° C. and the sintering time is 3 to 5 hours. The other steps are the same as specific embodiments 1 to 9.

[0042] The following examples are used to verify the beneficial effects of the present invention:

[0043] Example 1: A method for in-situ synthesis of ZrC reinforced ZTA composite ceramics is specifically completed by the following steps:

[0044] 1. Prepare slurry:

[0045] Alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder are used as raw materials, sucrose aqueous solution is used as solvent, and a stirred mill connected in series with a sand mill is used in combination with a ball milling process to form a high solid content slurry;

[0046] The mass ratio of the alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder described in step 1 is 77:20:0.5:1.5:0.3:0.5:0.2;

[0047] The median particle size D50 of the zirconium oxide powder described in step 1 is 1.0 μm;

[0048] The median particle size D50 of the slurry described in step 1 is 1.0 μm to 1.05 μm, and the solid content of the slurry is 65%;

[0049] 2. Spray granulate the high solid content slurry to obtain spherical particle powder;

[0050] The particle size of the spherical granular powder in step 2 is 30 mesh to 200 mesh, and the inlet temperature is controlled within 300° C. and the outlet temperature is controlled at 100° C. during spray granulation;

[0051] 3. In a cold isostatic pressing machine, the spherical particle powder is pressed into shape to form a ceramic green body;

[0052] The molding pressure in step 3 is 150 MPa;

[0053] Fourth, the ceramic green body was sintered in a vacuum furnace at a temperature of 1600°C for 4 hours to obtain ZrC reinforced ZTA composite ceramics;

[0054] The mass fraction of ZrC in the ZrC-reinforced ZTA composite ceramic described in step 4 is 5%, and the molar ratio of C to ZrO2 produced by carbonization of the saccharide compound described in step 1 is 3.7:1.

[0055] Example 2: A method for in-situ synthesis of ZrC reinforced ZTA composite ceramics is specifically completed by the following steps:

[0056] 1. Prepare slurry:

[0057] Alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder are used as raw materials, sucrose aqueous solution is used as solvent, and a stirred mill connected in series with a sand mill is used in combination with a ball milling process to form a high solid content slurry;

[0058] The mass ratio of the alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder described in step 1 is 82:15:0.5:1.5:0.3:0.5:0.2;

[0059] The median particle size D50 of the zirconium oxide powder described in step 1 is 1.0 μm;

[0060] The median particle size D50 of the slurry described in step 1 is 1.4 μm to 1.45 μm, and the solid content of the slurry is 65%;

[0061] 2. Spray granulate the high solid content slurry to obtain spherical particle powder;

[0062] The particle size of the spherical granular powder in step 2 is 30 mesh to 200 mesh, and the inlet temperature is controlled within 300° C. and the outlet temperature is controlled at 100° C. during spray granulation;

[0063] 3. In a cold isostatic pressing machine, the spherical particle powder is pressed into shape to form a ceramic green body;

[0064] The molding pressure in step 3 is 150 MPa;

[0065] Fourth, the ceramic green body was sintered in a vacuum furnace at a temperature of 1650°C for 3 hours to obtain ZrC reinforced ZTA composite ceramics;

[0066] The mass fraction of ZrC in the ZrC-reinforced ZTA composite ceramic described in step 4 is 3%, and the molar ratio of C to ZrO2 produced by carbonization of the saccharide compound described in step 1 is 3.5:1.

[0067] Example 3: A method for in-situ synthesis of ZrC-reinforced ZTA composite ceramics is specifically completed by the following steps:

[0068] 1. Prepare slurry:

[0069] Alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder are used as raw materials, sucrose aqueous solution is used as solvent, and a stirred mill connected in series with a sand mill is used in combination with a ball milling process to form a high solid content slurry;

[0070] The mass ratio of the alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder described in step 1 is 25:72:0.5:1.5:0.3:0.5:0.2;

[0071] The median particle size D50 of the zirconium oxide powder described in step 1 is 1.0 μm;

[0072] The median particle size D50 of the slurry described in step 1 is 0.8 μm to 0.85 μm, and the solid content of the slurry is 65%;

[0073] 2. Spray granulate the high solid content slurry to obtain spherical particle powder;

[0074] The particle size of the spherical granular powder in step 2 is 30 mesh to 200 mesh, and the inlet temperature is controlled within 300° C. and the outlet temperature is controlled at 100° C. during spray granulation;

[0075] 3. In a cold isostatic pressing machine, the spherical particle powder is pressed into shape to form a ceramic green body;

[0076] The molding pressure in step 3 is 150 MPa;

[0077] Fourth, the ceramic green body was sintered in a vacuum furnace at a temperature of 1560°C for 5 hours to obtain ZrC reinforced ZTA composite ceramics;

[0078] The mass fraction of ZrC in the ZrC-reinforced ZTA composite ceramic described in step 4 is 7%, and the molar ratio of C to ZrO2 produced by carbonization of the carbohydrate compound described in step 1 is 4.0:1.

[0079] Comparative Example 1: A method for preparing ZTA ceramics is specifically completed by the following steps:

[0080] 1. Prepare slurry:

[0081] Alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, cerium oxide powder are used as raw materials, water is used as solvent, and a stirred mill connected with a sand mill is used in combination with a ball milling process to form a high solid content slurry;

[0082] The mass ratio of the alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder described in step 1 is 82:15:0.5:1.5:0.3:0.5:0.2;

[0083] The median particle size D50 of the zirconium oxide powder described in step 1 is 1.0 μm;

[0084] The median particle size D50 of the slurry described in step 1 is 1.0 μm to 1.05 μm, and the solid content of the slurry is 65%;

[0085] 2. Spray granulate the high solid content slurry to obtain spherical particle powder;

[0086] The particle size of the spherical granular powder in step 2 is 30 mesh to 200 mesh, and the inlet temperature is controlled within 300° C. and the outlet temperature is controlled at 100° C. during spray granulation;

[0087] 3. In a cold isostatic pressing machine, the spherical particle powder is pressed into shape to form a ceramic green body;

[0088] The molding pressure in step 3 is 150 MPa;

[0089] 4. The ceramic green body is sintered in a vacuum furnace at a temperature of 1600°C and a sintering time of 4 hours to obtain ZTA ceramics.

[0090] Comparative Example 2: A method for preparing ZrC-reinforced ZTA composite ceramics by introducing zirconium carbide in the form of solid particles is specifically completed by the following steps:

[0091] 1. Prepare slurry:

[0092] Alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder are used as raw materials. Zirconium carbide particles are added to the raw materials. Sucrose aqueous solution is used as solvent. A stirred mill connected with a sand mill is used in conjunction with a ball milling process to form a high solid content slurry.

[0093] The mass ratio of the alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder described in step 1 is 82:15:0.5:1.5:0.3:0.5:0.2;

[0094] The median particle size D50 of the zirconium oxide powder described in step 1 is 1.0 μm;

[0095] The median particle size D50 of the slurry described in step 1 is 1.0 μm to 1.05 μm, and the solid content of the slurry is 65%;

[0096] 2. Spray granulate the high solid content slurry to obtain spherical particle powder;

[0097] The particle size of the spherical granular powder in step 2 is 30 mesh to 200 mesh, and the inlet temperature is controlled within 300° C. and the outlet temperature is controlled at 100° C. during spray granulation;

[0098] 3. In a cold isostatic pressing machine, the spherical particle powder is pressed into shape to form a ceramic green body;

[0099] The molding pressure in step 3 is 150 MPa;

[0100] Fourth, the ceramic green body was sintered in a vacuum furnace at a temperature of 1600°C for 4 hours to obtain ZrC reinforced ZTA composite ceramics;

[0101] The mass fraction of ZrC in the ZrC reinforced ZTA composite ceramics described in step 4 is 5%.

[0102] Figure 1 The X-ray diffraction pattern of the ZrC reinforced ZTA composite ceramic prepared in Example 1;

[0103] from Figure 1 It can be seen that there is an obvious ZrC diffraction peak in the XRD spectrum, and the peak intensity is relatively high, indicating that the ZrC / ZTA composite ceramics can be successfully prepared in situ using the method of the present invention.

[0104] Figure 2 This is a scanning electron photograph of the ZrC-reinforced ZTA composite ceramic prepared in Example 1, magnified 2000 times;

[0105] from Figure 2 It can be seen that the grain size of ZrC / ZTA composite ceramics is uniform, there is no abnormal grain growth, zirconium oxide and zirconium carbide are dispersed in the matrix, forming a good embedded structure, which helps to improve the strength and toughness of the material.

[0106] Figure 3 This is a scanning electron photograph of the ZrC reinforced ZTA composite ceramic prepared in Example 1, magnified 5000 times;

[0107] Figure 3 yes Figure 2The enlarged image further shows the grain size and distribution in the ZrC / ZTA composite ceramic. At the same time, it can be seen that there are more transgranular fractures and grain pullout phenomena on the ceramic cross section; especially the appearance of intracrystalline particles, which are helpful to improve the strength and toughness of the material, and also improve the wear resistance of the material.

[0108] Figure 4 This is a scanning electron photograph of the ZTA ceramic prepared in Comparative Example 1 magnified 2000 times;

[0109] from Figure 4 It can be seen that since Comparative Example 1 has only two phases, zirconium oxide and aluminum oxide, compared with Example 1, the grain size is obviously larger and the distribution uniformity of zirconium is relatively poor.

[0110] Figure 5 This is a scanning electron photograph of the ZrC-reinforced ZTA composite ceramic prepared in Comparative Example 2, magnified 1000 times;

[0111] from Figure 5 It can be seen that when solid ZrC is directly mixed into ZTA, since the ZrC particles are very hard, it is difficult to refine and homogenize them. Compared with Example 1, it can be clearly seen that the ZrC particles are unevenly distributed inside the green body, which is bound to affect the various properties of the material.

[0112] The ceramics prepared in each embodiment and comparative example were subjected to hardness, fracture toughness, flexural strength and sandblasting tests (JC / T2345-2015). The results are shown in Table 1.

[0113] Table 1 Test results of ceramic properties prepared in various embodiments and comparative examples

[0114]

Claims

1. A method for in-situ synthesis of ZrC reinforced ZTA composite ceramics, characterized in that The volume density of the ZrC reinforced ZTA composite ceramic prepared by the method is 5.10 g / cm 3 , Vickers hardness HV5 is 17.6, fracture toughness is 7.09MPa.m 1 / 2 , sandblasting abrasion is 0.020cm 3 , flexural strength is 520MPa; The method is specifically completed according to the following steps:

1. Prepare slurry: Alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder are used as raw materials, sucrose aqueous solution is used as solvent, and a stirred mill connected in series with a sand mill is used in combination with a ball milling process to form a high solid content slurry; The mass ratio of the alumina powder, zirconium oxide powder, talc, Suzhou soil, light calcium, lanthanum oxide, and cerium oxide powder described in step 1 is 25:72:0.5:1.5:0.3:0.5:0.2; The median particle size D50 of the zirconium oxide powder described in step 1 is 1.0 μm; The median particle size D50 of the slurry described in step 1 is 0.8 μm to 0.85 μm, and the solid content of the slurry is 65%; 2. Spray granulate the high solid content slurry to obtain spherical particle powder; The particle size of the spherical granular powder in step 2 is 30 mesh to 200 mesh, and the inlet temperature is controlled within 300° C. and the outlet temperature is controlled at 100° C. during spray granulation; 3. In a cold isostatic pressing machine, the spherical particle powder is pressed into shape to form a ceramic green body; The molding pressure in step 3 is 150 MPa; Fourth, the ceramic green body was sintered in a vacuum furnace at a temperature of 1560°C for 5 hours to obtain ZrC reinforced ZTA composite ceramics; The mass fraction of ZrC in the ZrC-reinforced ZTA composite ceramic described in step 4 is 7%, and the molar ratio of C to ZrO2 produced by the carbonization of sucrose described in step 1 is 4.0:1.

Images