CN101172855A - Low-temperature melt producing method of cubic polycrystal zirconia ceramics with yttrium oxide as stabilizing agent - Google Patents

Abstract

The invention discloses a low temperature sintering preparation method which uses yttria as stabilizer to prepare tetragonal polycrystalline zirconia porcelain (Y-TZP porcelain). The invention is mainly characterized in that the method includes two steps of preparing precursor sol and preparing fine-grained porcelain: utilizing the raw materials including soluble salt containing Mg and Al ion and Si (OC2H5) 4, wherein, the mol ratio of MgO : Al2O3:SiO2 is (0.3 to 0.8):(2.3 to 6):(1 to 3.5) when making the precursor sol. The ZrO2 nano ultrafine powder with stable Y2O 3 is added with water to form slurry material according to the solid and liquid ratio of (75-85):(25-15), adding 3-8 wt percent precursor sol, equally mixing in ball milling, and then forming grain and mold, sintering in the temperature of 1320 to 1420 DEG C for one to three hours, and then gaining nano grain Y-TZP porcelain. The Y-TZP porcelain consisting of nano grains has the advantages of good mechanic performance, low sintering temperature and low cost, and can be widely applicable to serve as high-performance wear-resistant component material for the fields of chemical industry, mechanics, communication, avigation and spaceflight, etc.

Description

With the low-temperature melt producing method of yttrium oxide as the cubic polycrystal zirconia ceramics of stablizer

Technical field

It is thin brilliant in the preparation method of yttrium oxide as the cubic polycrystal zirconia ceramics (hereinafter to be referred as the Y-TZP pottery) of stablizer to the present invention relates to a kind of low-temperature sintering, belongs to the preparing technical field of structural ceramic material.

Background technology

With yittrium oxide (Y ₂O ₃) as the cubic polycrystal zirconia ceramics (Y-TZP) of stabilizing agent as the best a kind of zirconia material of combination property, day by day play an important role in fields such as chemical industry, machinery, communication and Aero-Space.Yet the Y-TZP zirconia ceramics of at present extensive use generally adopts solid-phase sintering process, and sintering temperature is at 1450-1600 ℃, and to the equipment requirement height, energy consumption is big, makes the production cost of zirconia product high, has seriously limited the further application of this material.The low-temperature sintering technology patent of the existing Y-TZP pottery that relates to mainly comprises the three major types patent: at Y ₂O ₃The basis on adopt compound stabilizer and add the glass sintering agent, and adopt non-normal pressure agglomerating plant to realize low-temperature sintering by other sintering technology, in general, above-mentioned several method remains in the sintering structure mechanical property and has much room for improvement, sintering temperature is relatively higher, the more high weak point of cost can not satisfy the requirement of suitability for industrialized production.

Below several typical technologies of preparing are done a summary:

Adopt the patent of compound additive that Japan Patent JP7187774 is arranged, it is characterized by: select two or more stabilizing agents, such as Y ₂O ₃, Yb ₂O ₃, Ho ₂O ₃, Er ₂O ₃, Dy ₂O ₃, add again the B of 0.05-2wt% ₂O ₃, the total amount of all additives is 2-6wt%, composite powder is 500-1200 ℃ of calcining, but material at 1300-1600 ℃ of just dense sintering, sintered body is made up of four directions and a small amount of Emission in Cubic, average grain size is 5 μ m, density of material is greater than 5.8g/cm ³Chinese patent CN02111146.4 belongs to patent of the same type, it is characterized by: adopt coprecipitation to prepare (Mg, the Y)-ZrO of magnesia and yittrium oxide jointly stabilizing ₂Powder, MgO and Y ₂O ₃Addition be respectively 5-14mol% and 0.2-2mol%, add again amorphous state YAS (Y ₂O ₃-Al ₂O ₃-SiO ₂) sintering agent, sample can be at 1250 ℃ of-1400 ℃ of sintering, and grain size is 200-400nm, and the bending strength of material is 384-818MPa, and fracture toughness is 5.2-8.3MPam ^1/2This type of patent mainly is by compound interpolation rare earth oxide, on the one hand can acceleration of sintering, can play the problem of improving Y-TZP ceramic low-temp performance degradation in addition.The Equations of The Second Kind patent is to reduce the sintering temperature of Y-TZP pottery by adding the glass sintering agent, and typical patent has Chinese patent CN02110868.4, has reported with the standby CaO-Al of melten glass legal system ₂O ₃-SiO ₂Glass, by mechanical mixing at Y ₂O ₃Content is the glass additive that adds 0.5-3.0wt% in the Y-TZP nano-powder of 2-3mol%, 1350 ℃-1450 ℃ sintering 1-3 hour, can obtain the zirconia ceramics of nanocrystal, the bending strength of material and fracture toughness are respectively 820-960MPa and 9.5-9.8MPam ^1/2This type of patent is by mechanical mixing the ready-formed glass powder to be distributed in the Zirconium oxide powder, at the lesser temps glass melting, produces liquid phase sintering when burning till, thereby promotes densification sintering, reduces sintering temperature.Because the glass sintering agent is to add with mechanical mixing, may cause skewness, will affect the stability of material property.Sintering agent exists mainly with glassy phase greatly in sintered body in addition, is distributed on the crystal boundary, will affect the middle high-temperature behavior of material.The patent that the 3rd class is intended to reduce sintering temperature has Chinese patent 200510052090.X, has reported with nanometer ZrO ₂Raw material, using plasma activated sintering is 1250 ℃-1300 ℃ in temperature, and pressure is to make thin brilliant zirconia ceramics under the condition of 30MPa, and this patent characteristics mainly are the improvement of article on plasma technology, and its sintering mechanism is with normal pressure-sintered different fully.

Summary of the invention

The object of the present invention is to provide a kind of with the low-temperature melt producing method of yttrium oxide as the cubic polycrystal zirconia ceramics of stablizer, the i.e. preparation method of Low Temperature Sintering Superfine Y-TZP Ceramics pottery.Y-TZP pottery with this method preparation is made up of nanocrystal, has the good mechanical performance, sintering temperature is low and lower-cost advantage, can be used as high performance wear parts material and is widely used in fields such as chemical industry, machinery, communication and aerospace.

The objective of the invention is to be realized by following technical proposals: with MgO-Al ₂O ₃-SiO ₂Composite precursor sol and Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is raw material, comprises the preparation of precursor sol and the preparation of superfine ceramics, and the concrete technology step is as follows:

A). with the soluble-salt that contains the Mg ion, the soluble-salt that contains the Al ion and Si (OC ₂H ₅) ₄Be raw material, wherein MgO: Al ₂O ₃: SiO ₂Mol ratio be (0.3-0.8): (2.3-6): (1-3.5); At first with Si (OC ₂H ₅) ₄Be hydrolyzed 24 hours, the soluble-salt that will contain again Mg, Al ion is dissolved in respectively in the deionized water; With Si (OC ₂H ₅) ₄Hydrating solution is base fluid, and the solution that will contain Mg, Al ion splashes into respectively in the base fluid synchronously, is 9-10.5 by dropping ammonia control pH value, constantly stirs at titration process, still stirs 30 minutes after titration is complete, forms the MgO-Al of magnesium aluminate spinel and mullite ₂O ₃-SiO ₂Composite precursor sol;

B). with Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is (75-85) by the solid-liquid mass ratio: (25-15) add water and be made into slurry;

C). in above-mentioned slurry, add the MgO-Al of 3-8wt% ₂O ₃-SiO ₂Composite precursor sol, evenly mixing and ball milling;

D). mist projection granulating, moulding at 1320-1420 ℃ of sintering 1-3 hour, obtain the cubic polycrystal zirconia ceramics of the usefulness yttrium oxide of nanocrystal as stablizer.

The objective of the invention is and can also be realized by following technical proposals:

The described Mg of containing ionic soluble salt is MgCl ₂6H ₂O or Mg (NO ₃) ₂6H ₂O, the described Al of containing ionic soluble salt is AlCl ₃6H ₂O or Al (NO ₃) ₃9H ₂O.

Described MgO: Al ₂O ₃: SiO ₂Mol ratio be 0.3: 2.3: 1.

Described MgO: Al ₂O ₃: SiO ₂Mol ratio be 0.5: 4.5: 2.3.

Described MgO: Al ₂O ₃: SiO ₂Mol ratio be 0.8: 6: 3.5.

One of realization approach of the present invention is: with MgO-Al ₂O ₃-SiO ₂Composite precursor sol and Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is raw material, comprises the preparation of precursor sol and the preparation of superfine ceramics, and the concrete technology step is as follows:

A). with MgCl ₂6H ₂O, AlCl ₃6H ₂O and Si (OC ₂H ₅) ₄Be raw material, wherein MgO: Al ₂O ₃: SiO ₂Mol ratio be 0.5: 3: 1.5; At first with Si (OC ₂H ₅) ₄Be hydrolyzed 24 hours, again with MgCl ₂6H ₂O, AlCl ₃6H ₂O is dissolved in respectively and obtains in the deionized water to contain the Mg ion and contain the Al solion; With Si (OC ₂H ₅) ₄Hydrating solution is base fluid, the solution that will contain Mg, Al ion splashes in the base fluid respectively synchronously, controlling the pH value by dropping ammonia is 9-10.5, in titration process, constantly stir, still stirred after titration is complete 30 minutes, obtain leucosol, will use washed with de-ionized water behind the colloidal sol suction filtration, the multipass that so circulates is until can't detect Cl in the suction filtration water ^-Exist, with cleaning, the complete MgO-Al of suction filtration ₂O ₃-SiO ₂The sol system that presoma is made seals stand-by;

B). take by weighing Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is 75: 25 furnishing slurries by the solid-liquid mass ratio;

C). in above-mentioned slurry, add the MgO-Al of 3-8wt% ₂O ₃-SiO ₂Composite precursor sol adds ammonium polyacrylate dispersant and distilled water again, inserts after the mixing and stirs in the mill mix grinding 4 hours;

D). at 380 ℃ of temperature, pressure 6 * 10 ⁴Mist projection granulating under the Pa condition, particle diameter are 30-50 μ m; Add then in the mould of packing into after the wet treatment, under pressure 50-80MPa condition, dry-pressing formed is strip, again isostatic pressing under 180MPa pressure; The moulding strip at 1380 ℃ of sintering, is incubated 1 hour, obtains the cubic polycrystal zirconia ceramics of the usefulness yttrium oxide of nanocrystal as stablizer.

Two of realization approach of the present invention is: with MgO-Al ₂O ₃-SiO ₂Composite precursor sol and Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is raw material, comprises the preparation of precursor sol and the preparation of superfine ceramics, and the concrete technology step is as follows:

A). with Mg (NO ₃) ₂6H ₂O, Al (NO ₃) ₃9H ₂O and Si (OC ₂H ₅) ₄Be raw material, wherein MgO: Al ₂O ₃: SiO ₂Mol ratio be 0.8: 2.3: 1; At first with Si (OC ₂H ₅) ₄Be hydrolyzed 24 hours, again with Mg (NO ₃) ₂6H ₂O, Al (NO ₃) ₃9H ₂O is dissolved in respectively and obtains in the deionized water to contain the Mg ion and contain the Al solion; With Si (OC ₂H ₅) ₄Hydrating solution is base fluid, the solution that will contain Mg, Al ion splashes in the base fluid respectively synchronously, controlling the pH value by dropping ammonia is 9-10.5, in titration process, constantly stir, still stirred after titration is complete 30 minutes, and obtained leucosol, will use washed with de-ionized water behind the colloidal sol suction filtration, circulation multipass like this is with cleaning, the complete MgO-Al of suction filtration ₂O ₃-SiO ₂The sol system that presoma is made seals stand-by;

B). take by weighing Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is 80: 20 furnishing slurries by the solid-liquid mass ratio;

C). in above-mentioned slurry, add the MgO-Al of 3-8wt% ₂O ₃-SiO ₂Composite precursor sol adds ammonium polyacrylate dispersant and distilled water again, inserts after the mixing and stirs in the mill mix grinding 4 hours;

D). at 380 ℃ of temperature, pressure 8 * 10 ⁴Mist projection granulating under the Pa condition, particle diameter are 30-50 μ m; Add then in the mould of packing into after the wet treatment, under pressure 50-80MPa condition, dry-pressing formed is strip, again isostatic pressing under 180MPa pressure; The moulding strip at 1320 ℃ of sintering, is incubated 1 hour, obtains the cubic polycrystal zirconia ceramics of the usefulness yttrium oxide of nanocrystal as stablizer.

The present invention has following significant advantage and progress: the density of the 3Y-TZP pottery of preparation is 6.0-6.05, and grain-size is 200-500nm, and bending strength is 826-1020MPa, and fracture toughness property is 10.2-14.6MPam ^1/2, Wei pool modulus is 16-18.By at ZrO ₂(3Y ₂O ₃) add MgO-Al in the slurry ₂O ₃-SiO ₂Presoma makes the uniform composite powder of component.Presoma can play the effect of liquid phase sintering at lesser temps in sintering process, and material can be at 1320-1420 ℃ of sintering.At high temperature amorphous presoma generation crystallization, precipitated phase is distributed on the crystal boundary, suppresses grain growing, makes material have better anti-low temperature aging performance and middle high-temperature behavior, thereby have the good mechanical performance, sintering temperature is low and lower-cost advantage.

Description of drawings

The micro-electromicroscopic photograph on the zirconia ceramics surface that Fig. 1 makes for the embodiment of the invention 1

The zirconia ceramics XRD diffractogram that Fig. 2 makes for the embodiment of the invention 1

Embodiment

Embodiment 1:

MgO-Al ₂O ₃-SiO ₂The preparation of composite precursor sol:

Press MgO: Al ₂O ₃: SiO ₂Mol ratio is respectively accurately to take by weighing 102.6 gram MgCl at 0.5: 3: 1.5 ₂6H ₂O, 1428.6 gram AlCl ₃6H ₂O and 321.45 gram Si (OC ₂H ₅) ₄With 321.45 gram Si (OC ₂H ₅) ₄Be hydrolyzed 24 hours, add then deionized water to 2 liter, as base fluid; With 102.6 gram MgCl ₂6H ₂O and 1428.6 gram AlCl ₃6H ₂O dissolves in respectively in 1 liter and the 2 liters of deionized waters, obtains to contain magnesium ion and aluminum ions solution, will contain magnesium ion again and aluminum ions solution splashes into Si (OC synchronously ₂H ₅) ₄In the hydrating solution, keeping the pH value of solution by dropping ammonia simultaneously is 9-10.5, constantly stirs Si (OC at titration process ₂H ₅) ₄Hydrating solution.Half an hour is stirred in the complete rear continuation of titration, obtains leucosol.To use washed with de-ionized water behind the colloidal sol suction filtration, suction filtration detects less than Cl in suction filtration water with this multipass that circulates once more ^-Ion exists, and detects Cl with Silver Nitrate ^-Ion.With cleaning, the complete MgO-Al of suction filtration ₂O ₃-SiO ₂It is 3 liters sol system that presoma is made volume, seals stand-by.

The preparation of zirconia ceramics:

Take by weighing and contain 3mol%Y ₂O ₃Superfine zirconia 30kg, be 75: 25 furnishing slips by the solid-liquid mass ratio, add the precursor solution of 4588.5ml present embodiment preparation, add again 2590ml ammonium polyacrylate dispersant (PAA) and 1.2kg distilled water.Compound inserted stirred in the mill mix grinding 4 hours, slip is at 380 ℃, and pressure is 6 * 10 ⁴Mist projection granulating under the Pa condition, granulation powder directly are 30-50 μ m.Powder being added wet treatment, reinstall in the mould, is under the 50-80MPa condition at pressure, dry-pressing formed 3.5 * 6.5 * 40m that is of a size of ³Strip, isostatic pressing under 180MPa pressure again.The moulding strip at 1380 ℃ of sintering, and is incubated 1 hour.With the intensity of three-point bending method mensuration strip, every group of test result is the mean value of 5 strips, and the flexural strength of material is 868 ± 28.9MPa, and fracture toughness property is 13.5 ± 0.24MPam ^1/2

Embodiment 2:

MgO-Al ₂O ₃-SiO ₂The preparation of composite precursor sol:

Press MgO: Al ₂O ₃: SiO ₂Mol ratio is respectively accurately to take by weighing 205.1 gram Mg (NO at 0.8: 2.3: 1 ₃) ₂6H ₂O, 1725 gram Al (NO ₃) ₃9H ₂O and 208.33 gram Si (OC ₂H ₅) ₄With 208.33 gram Si (OC ₂H ₅) ₄Be hydrolyzed 24 hours, add then deionized water to 2 liter, as base fluid; With 205.1 gram Mg (NO ₃) ₂6H ₂O and 1725 gram Al (NO ₃) ₃9H ₂O dissolves in respectively in 1 liter and the 2 liters of deionized waters, obtains to contain magnesium ion and aluminum ions solution, will contain magnesium ion again and aluminum ions solution splashes into Si (OC synchronously ₂H ₅) ₄In the hydrating solution, keeping the pH value of solution by dropping ammonia simultaneously is 9-10.5, constantly stirs Si (OC at titration process ₂H ₅) ₄Hydrating solution.Half an hour is stirred in the complete rear continuation of titration, obtains leucosol.To use washed with de-ionized water behind the colloidal sol suction filtration, suction filtration once more is with this multipass that circulates.With cleaning, the complete MgO-Al of suction filtration ₂O ₃-SiO ₂It is 2 liters sol system that presoma is made volume, seals stand-by.

The preparation of zirconia ceramics:

Take by weighing and contain 3mol%Y ₂O ₃Superfine zirconia 30kg, be 80: 20 furnishing slips by the solid-liquid mass ratio, add the precursor solution of 9648ml present embodiment preparation, add again 2670ml ammonium polyacrylate dispersant (PAA) and 0.5kg distilled water.Compound inserted stirred in the mill mix grinding 4 hours, slip is at 380 ℃, and pressure is 8 * 10 ⁴Mist projection granulating under the Pa condition, granulation powder directly are 30-50 μ m.Powder being added wet treatment, reinstall in the mould, is under the 50-80MPa condition at pressure, dry-pressing formed 3.5 * 6.5 * 40m that is of a size of ³Strip, isostatic pressing under 180MPa pressure again.The moulding strip at 1320 ℃ of sintering, and is incubated 1 hour.With the intensity of three-point bending method mensuration strip, every group of test result is the mean value of 5 strips, and the flexural strength of material is 922 ± 36.7MPa, and fracture toughness property is 11.7 ± 0.31MPam ^1/2

Claims (7)

1. with the low-temperature melt producing method of yittrium oxide as the cubic polycrystal zirconia ceramics of stabilizing agent, it is characterized in that: with MgO-Al ₂O ₃-SiO ₂Composite precursor sol and Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is raw material, comprises the preparation of precursor sol and the preparation of superfine ceramics, and the concrete technology step is as follows:

A). with the soluble-salt that contains the Mg ion, the soluble-salt that contains the Al ion and Si (OC ₂H ₅) ₄Be raw material, wherein MgO: Al ₂O ₃: SiO ₂Mol ratio be (0.3-0.8): (2.3-6): (1-3.5); At first with Si (OC ₂H ₅) ₄Be hydrolyzed 24 hours, the soluble-salt that will contain again Mg, Al ion is dissolved in respectively in the deionized water; With Si (OC ₂H ₅) ₄Hydrating solution is base fluid, and the solution that will contain Mg, Al ion splashes into respectively in the base fluid synchronously, is 9-10.5 by dropping ammonia control pH value, constantly stirs at titration process, still stirs 30 minutes after titration is complete, forms the MgO-Al of magnesium aluminate spinel and mullite ₂O ₃-SiO ₂Composite precursor sol;

B). with Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is (75-85) by the solid-liquid mass ratio: (25-15) add water and be made into slurry;

C). in above-mentioned slurry, add the MgO-Al of 3-8wt% ₂O ₃-SiO ₂Composite precursor sol, evenly mixing and ball milling;

D). mist projection granulating, moulding at 1320-1420 ℃ of sintering 1-3 hour, obtain the cubic polycrystal zirconia ceramics of the usefulness yttrium oxide of nanocrystal as stablizer.

2. according to claim 1 with the low-temperature melt producing method of yttrium oxide as the cubic polycrystal zirconia ceramics of stablizer, it is characterized in that: the described Mg of containing ionic soluble salt is MgCl ₂6H ₂O or Mg (NO ₃) ₂6H ₂O, the described Al of containing ionic soluble salt is AlCl ₃6H ₂O or Al (NO ₃) ₃9H ₂O.

3. according to claim 1 and 2 with the low-temperature melt producing method of yittrium oxide as the cubic polycrystal zirconia ceramics of stabilizing agent, it is characterized in that: described MgO: Al ₂O ₃: SiO ₂Mol ratio be 0.3: 2.3: 1.

4. according to claim 1 and 2 with the low-temperature melt producing method of yittrium oxide as the cubic polycrystal zirconia ceramics of stabilizing agent, it is characterized in that: described MgO: Al ₂O ₃: SiO ₂Mol ratio be 0.5: 4.5: 2.3.

5. according to claim 1 and 2 with the low-temperature melt producing method of yittrium oxide as the cubic polycrystal zirconia ceramics of stabilizing agent, it is characterized in that: described MgO: Al ₂O ₃: SiO ₂Mol ratio be 0.8: 6: 3.5.

6. according to claim 1 and 2 with the low-temperature melt producing method of yittrium oxide as the cubic polycrystal zirconia ceramics of stabilizing agent, it is characterized in that: with MgO-Al ₂O ₃-SiO ₂Composite precursor sol and Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is raw material, comprises the preparation of precursor sol and the preparation of superfine ceramics, and the concrete technology step is as follows:

A). with MgCl ₂6H ₂O, AlCl ₃6H ₂O and Si (OC ₂H ₅) ₄Be raw material, wherein MgO: Al ₂O ₃: SiO ₂Mol ratio be 0.5: 3: 1.5; At first with Si (OC ₂H ₅) ₄Be hydrolyzed 24 hours, again with MgCl ₂6H ₂O, AlCl ₃6H ₂O is dissolved in respectively and obtains in the deionized water to contain the Mg ion and contain the Al solion; With Si (OC ₂H ₅) ₄Hydrating solution is base fluid, the solution that will contain Mg, Al ion splashes in the base fluid respectively synchronously, controlling the pH value by dropping ammonia is 9-10.5, in titration process, constantly stir, still stirred after titration is complete 30 minutes, obtain leucosol, will use washed with de-ionized water behind the colloidal sol suction filtration, the multipass that so circulates is until can't detect Cl in the suction filtration water ^-Exist, with cleaning, the complete MgO-Al of suction filtration ₂O ₃-SiO ₂The sol system that presoma is made seals stand-by;

B). take by weighing Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is 75: 25 furnishing slurries by the solid-liquid mass ratio;

C). in above-mentioned slurry, add the MgO-Al of 3-8wt% ₂O ₃-SiO ₂Composite precursor sol adds ammonium polyacrylate dispersant and distilled water again, inserts after the mixing and stirs in the mill mix grinding 4 hours;

D). at 380 ℃ of temperature, pressure 6 * 10 ⁴Mist projection granulating under the Pa condition, particle diameter are 30-50 μ m; Add then in the mould of packing into after the wet treatment, under pressure 50-80MPa condition, dry-pressing formed is strip, again isostatic pressing under 180MPa pressure; The moulding strip at 1380 ℃ of sintering, is incubated 1 hour, obtains the cubic polycrystal zirconia ceramics of the usefulness yttrium oxide of nanocrystal as stablizer.

7. according to claim 1 and 2 with the low-temperature melt producing method of yittrium oxide as the cubic polycrystal zirconia ceramics of stabilizing agent, it is characterized in that: with MgO-Al ₂O ₃-SiO ₂Composite precursor sol and Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is raw material, comprises the preparation of precursor sol and the preparation of superfine ceramics, and the concrete technology step is as follows:

A). with Mg (NO ₃) ₂6H ₂O, Al (NO ₃) ₃9H ₂O and Si (OC ₂H ₅) ₄Be raw material, wherein MgO: Al ₂O ₃: SiO ₂Mol ratio be 0.8: 2.3: 1; At first with Si (OC ₂H ₅) ₄Be hydrolyzed 24 hours, again with Mg (NO ₃) ₂6H ₂O, Al (NO ₃) ₃9H ₂O is dissolved in respectively and obtains in the deionized water to contain the Mg ion and contain the Al solion; With Si (OC ₂H ₅) ₄Hydrating solution is base fluid, the solution that will contain Mg, Al ion splashes in the base fluid respectively synchronously, controlling the pH value by dropping ammonia is 9-10.5, in titration process, constantly stir, still stirred after titration is complete 30 minutes, and obtained leucosol, will use washed with de-ionized water behind the colloidal sol suction filtration, circulation multipass like this is with cleaning, the complete MgO-Al of suction filtration ₂O ₃-SiO ₂The sol system that presoma is made seals stand-by;

B). take by weighing Y ₂O ₃Stable ZrO ₂The nano ultrafine powders end is 80: 20 furnishing slurries by the solid-liquid mass ratio;

C). in above-mentioned slurry, add the MgO-Al of 3-8wt% ₂O ₃-SiO ₂Composite precursor sol adds ammonium polyacrylate dispersant and distilled water again, inserts after the mixing and stirs in the mill mix grinding 4 hours;

D). at 380 ℃ of temperature, pressure 8 * 10 ⁴Mist projection granulating under the Pa condition, particle diameter are 30-50 μ m; Add then in the mould of packing into after the wet treatment, under pressure 50-80MPa condition, dry-pressing formed is strip, again isostatic pressing under 180MPa pressure; The moulding strip at 1320 ℃ of sintering, is incubated 1 hour, obtains the cubic polycrystal zirconia ceramics of the usefulness yttrium oxide of nanocrystal as stablizer.

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