CN106518023A - High-strength and high-toughness AZ bulletproof ceramics and preparation method thereof - Google Patents

Abstract

The invention relates to high-strength and high-toughness AZ bulletproof ceramics and a preparation method thereof. The high-strength and high-toughness AZ bulletproof ceramics contain the ingredients in parts by weight: 60-65 parts of high-purity ultrafine aluminum oxide micropowder, 33-88 parts of composite stable zirconium oxide ultrafine powder, 2-3 parts of nano rare-earth cerium oxide, 0.3-0.6 part of gum arabic fine powder, 0-0.5 part of efficient dispersant and 0-0.5 part of special mold releasing agent. The preparation method comprises the steps of carrying out cyclic-stirring grinding, carrying out spray granulation, carrying out dry-press forming, and carrying out high-temperature sintering, thereby preparing the finished product. According to the high-strength and high-toughness AZ bulletproof ceramics and the preparation method thereof, the gum arabic fine powder is used during production, so that the dispersity of slurry is improved greatly, the fluidity and solid content of the slurry are improved obviously compared with those of the ordinary slurry, help to subsequent production is achieved, and meanwhile, the production cost is also reduced greatly; and a small amount of nano rare-earth cerium oxide is introduced into the product, so that the toughening action of zirconium oxide to aluminum oxide is promoted effectively, and the performance of the product is improved greatly.

Description

A kind of high-intensity high-tenacity AZ Bullet-proof ceramic and preparation method thereof

Technical field

The present invention relates to a kind of high-intensity high-tenacity AZ bullet-proof ceramics and its manufacture method.

Background technology

The armor facing of domestic armored vehicle at present mainly adopts high intensity armour steel, and in order to reach protection effect, car body periphery need to be which increased the own wt of panzer, leveraged the mobility of panzer using a large amount of bulletproof armours by made by armour steel.The domestic early research that ceramic material has been applied to armor facing.Using the premium properties of ceramic material, compound composite armour of making is carried out with other materials and replace original armour steel, can not only be substantially reduced armor weight, improve the mobility of panzer, and bulletproof effect also increases.Mainly there are 99 aluminium oxide ceramics, Zirconia reinforced alumina ceramic, silicon carbide ceramics, boron carbide ceramics and titanium boride ceramicses currently as bullet-resistant ceramic material.99 aluminium oxide ceramics are cheap, but barrier propterty is general.Carborundum, boron carbide and titanium boride ceramicses superior performance, proportion are relatively low, but manufacturing process is complicated, and manufacturing cost is too high, and mass equipment is difficult to realize.And Zirconium oxide plasticizing bulletproof ceramic barrier propterty is significantly improved compared with 99 aluminium oxide ceramics, but production cost has a clear superiority compared with carborundum, boron carbide and titanium boride ceramicses, therefore cost performance highest.

Although the property indices of common AZ bullet-proof ceramics are significantly improved than aluminium oxide ceramics, but the also big gap compared with silicon carbide ceramics etc., and the present invention introduces nano rare earth cerium oxide due to being optimized to formula, the performance of material is made to be improved largely.The introducing of Radix Acaciae senegalis fine powder and parting agent special, had both reduced production cost, had also had certain help to material property simultaneously.

The content of the invention

For drawbacks described above, it is an object of the invention to provide a kind of process is simple, safe in production process, low production cost can greatly improve a kind of high-intensity high-tenacity AZ bullet-proof ceramics of properties of product and preparation method thereof.

For this technical solution adopted in the present invention it is：

Comprise the following steps：

（1）Circulation stirring mill grinding：By 60～65 parts of high-purity ultra-fine alumina micropowder, 33～38 parts of stable composition ultrafine zirconia powder, 2～3 parts of nano rare earth cerium oxide, 0.3～0.6 part of Radix Acaciae senegalis fine powder, 0～0.5 part of dispersant with high efficiency, 0～0.5 part of parting agent special is ground batch mixing 20-24 hours in being added to circulation stirring mill, the slurry for mixing is put in agitator and is stirred 2 hours to exclude the bubble in slurry；Bonding agent 3-5 parts are added in whipping process；

（2）Mist projection granulating：Above-mentioned compound is sprayed in granulation tower, good particle shape, good fluidity, the pelletizing that particle distribution range is narrow, moisture is moderate are obtained by controlling atomisation pressure, inlet temperature, leaving air temp, spray piece particle diameter, inlet temperature 270-310 DEG C, 100-120 DEG C of leaving air temp, enter to starch pressure 40-60, spray piece aperture 1.1-1.2mm；

（3）It is dry-pressing formed：Above-mentioned pelletizing is placed in sintered-carbide die to carry out compacting and obtains green compact, and pressing mode is Bidirectional-pressure, and lathe pressure tonnage is 250-300 tons；

（4）High temperature sintering：Green compact are placed on the kiln frame that kiln car is built or marshalling in saggar, are then pushed kiln loading vehicle in high-temperature shuttle kiln and is fired, firing temperature is 1850 DEG C, temperature retention time is 3-4 hours, finally prepared high-performance AZ bullet-proof ceramic.

It is an advantage of the invention that：

The present invention has used Radix Acaciae senegalis fine powder and parting agent special in process of production so that the safety and convenience in production process is substantially increased, and production cost is greatly reduced；Due to introducing a small amount of nano rare earth cerium oxide in product, properties of product, bulk density >=5.1g/cm is substantially increased³, Rockwell hardness >=92HRA, bending strength >=1100MPa, fracture toughness >=8.5MPa m^-1/2。

Specific embodiment

A kind of high-intensity high-tenacity AZ Bullet-proof ceramic, its component and weight proportion are：60～65 parts of high-purity ultra-fine alumina micropowder, 33～38 parts of stable composition ultrafine zirconia powder, 2～3 parts of nano rare earth cerium oxide, 0.3～0.6 part of Radix Acaciae senegalis fine powder, 0～0.5 part of dispersant with high efficiency, 0～0.5 part of parting agent special.

A kind of process of high-intensity high-tenacity AZ bullet-proof ceramics is manufactured, is comprised the following steps：

（1）Circulation stirring mill grinding：By 60～65 parts of high-purity ultra-fine alumina micropowder, 33～38 parts of stable composition ultrafine zirconia powder, 2～3 parts of nano rare earth cerium oxide, 0.3～0.6 part of Radix Acaciae senegalis fine powder, dispersant with high efficiency 0～.0.5 parts, parting agent special 0～.0.5 parts are ground batch mixing 20-24 hours in being added to circulation stirring mill, the slurry for mixing is put in agitator and is stirred 2 hours to exclude the bubble in slurry；Bonding agent 3-5 parts are added in whipping process；

（ 2 ）Mist projection granulating：Above-mentioned compound is sprayed in granulation tower, good particle shape, good fluidity, the pelletizing that particle distribution range is narrow, moisture is moderate are obtained by controlling atomisation pressure, inlet temperature, leaving air temp, spray piece particle diameter, inlet temperature 270-310 DEG C, 100-120 DEG C of leaving air temp, enter to starch pressure 40-60, spray piece aperture 1.1-1.2mm；

（3）It is dry-pressing formed：Above-mentioned pelletizing is placed in sintered-carbide die to carry out compacting and obtains green compact, and pressing mode is Bidirectional-pressure, and lathe pressure tonnage is 250-300 tons；

（4）High temperature sintering：Green compact are placed on the kiln frame that kiln car is built or marshalling in saggar, are then pushed kiln loading vehicle in high-temperature shuttle kiln and is fired, firing temperature is 1850 DEG C, temperature retention time is 3-4 hours, finally prepared high-performance AZ bullet-proof ceramic.

Claims (2)

1. a kind of high-intensity high-tenacity AZ bullet-proof ceramics, it is characterised in that its component and weight proportion are：60～65 parts of high-purity ultra-fine alumina micropowder, 33～38 parts of stable composition ultrafine zirconia powder, 2～3 parts of oxide nano rare earth, 0.30～0.6 part of Radix Acaciae senegalis fine powder, 0～0.5 part of dispersant with high efficiency, 0～0.5 part of parting agent special.

2. the process of a kind of high-intensity high-tenacity AZ bullet-proof ceramics described in manufacturing claims 1, it is characterised in that comprise the following steps：

（1）Circulation stirring mill grinding：By 60～65 parts of high-purity ultra-fine alumina micropowder, 33～38 parts of stable composition ultrafine zirconia powder, 2～3 parts of nano rare earth cerium oxide, 0.3～0.6 part of Radix Acaciae senegalis fine powder, 0～0.5 part of dispersant with high efficiency, 0～0.5 part of parting agent special is ground batch mixing 20-24 hours in being added to circulation stirring mill, the slurry for mixing is put in agitator and is stirred 2 hours to exclude the bubble in slurry；Bonding agent 3-5 parts are added in whipping process；

（2）Mist projection granulating：Above-mentioned compound is sprayed in granulation tower, good particle shape, good fluidity, the pelletizing that particle distribution range is narrow, moisture is moderate are obtained by controlling atomisation pressure, inlet temperature, leaving air temp, spray piece particle diameter, inlet temperature 270-310 DEG C, 100-120 DEG C of leaving air temp, enter to starch pressure 40-60, spray piece aperture 1.1-1.2mm；

（3）It is dry-pressing formed：Above-mentioned pelletizing is placed in sintered-carbide die to carry out compacting and obtains green compact, and pressing mode is Bidirectional-pressure, and lathe pressure tonnage is 250-300 tons；

（4）High temperature sintering：Green compact are placed on the kiln frame that kiln car is built or marshalling in saggar, are then pushed kiln loading vehicle in high-temperature shuttle kiln and is fired, firing temperature is 1850 DEG C, temperature retention time is 3-4 hours, finally prepared high-performance AZ bullet-proof ceramic.