CN1519406A

CN1519406A - Method for manufacturing injection molding zirconia products

Info

Publication number: CN1519406A
Application number: CNA031151639A
Authority: CN
Inventors: 施剑林; 蒋丹宇; 徐兵; 汪霖
Original assignee: Shanghai Institute of Ceramics of CAS
Current assignee: Shanghai Institute of Ceramics of CAS
Priority date: 2003-01-24
Filing date: 2003-01-24
Publication date: 2004-08-11
Anticipated expiration: 2023-01-24
Also published as: CN100385051C

Abstract

A process for preparing the zirconium oxide product by injection moulding includes such steps as modifying the zirconium oxide nanoparticles by sintering at 700-1000 deg.C for 0.5-20 hrs, preparing adhesive from PP, EVA, PE and PW, proportionally mixing them together at 80-150 deg.C, granulating, injection moulding, and sintering at 1400-1600 deg.C for 1-3 hrs. Its product features high density, bending strength and hardness.

Description

The preparation method of injection moulding zircite product

Technical field

The present invention relates to a kind of preparation method of guide roller of injection molding technique zirconia material making, use the preparation method of zirconia guide roller in particularly a kind of textile of chemical fibre industry, belong to the textile machinery accessories field.

Background technology

At present, the guide roller that uses in the textile of chemical fibre industry is many with Al ₂O ₃The pottery preparation.As publication number is that CN1242442A and CN1305975A all relate to a kind of employing injection moulding method and prepare Al ₂O ₃The method of guide roller.Because adopt injection moulding method, briquetting pressure is big, the blank density height, the hardness of goods is bigger behind the sintering, and surface smoothness is higher, product size precision height.But because the inherent characteristic of aluminium oxide, its product strength, toughness and fineness are compared with zirconia all big gap.Even so adopt the not basic problem that solves product quality of injection moulding method.

In actual use, because after guide roller and the silk thread high-speed friction, the surface is plucking easily, substandard products occur, has influenced product quality and business economic benefit.

With respect to Al ₂O ₃Pottery, zirconia phase transformation toughened ceramic be a kind of utilize zirconia and martensite phase transformation (promptly by the four directions in opposite directions monocline change mutually) effect improves the pottery of fragility.So-called toughened zirconium oxide material appearred from the seventies in 20th century, the mechanical performance of this material is increased substantially, especially room temperature toughness and intensity are in the ceramic material umber one, application as hot machine, wear resistant mechanical component is subjected to extensive concern, so far Manufactured toughening ceramic is various in style, and the tetragonal zirconia polycrystal pottery (Y-TZP) of stabilized with yttrium oxide is wherein most representative a kind of.Especially from the nineties in 20th century, Y-TZP is more given in the rise of nano ceramics new intension, reduces to nanometer scale with crystallite dimension and then must make ABRASION RESISTANCE, the agglutinating property of Y-TZP be different from previous micron dimension Y-TZP.If can with nanoscale Y-TZP powder prepare textile of chemical fibre already usefulness guide roller then its ABRASION RESISTANCE be expected and will further raising be arranged, thereby guide roller performance with its preparation, especially in ABRASION RESISTANCE, there is further lifting the surface smoothness aspect, in the high speed spinning process, be not prone to burr, thereby improve the chemical fibre quality.

Summary of the invention

The object of the present invention is to provide a kind of preparation method who is suitable for zirconia ceramics injection moulding with guide roller, it comprises that the nanometer scale zirconia powder to commercially available carries out selection three aspects of modification, selection of binder, injection moulding and calcining system.Processing by this several respects technology can make commercially available (trade mark is YSZ-3.0) powder, originally is only applicable to dry-pressing and isostatic compaction, is suitable for the injection moulding guide roller now.Its key technical indexes is near the special-purpose ZrO of injection moulding ₂The requirement of powder.

Now details are as follows respectively with it:

(1) modification of commercially available powder is handled

The commercially available powder trade mark that the present invention uses is YSZ-3.0 powder, Y ₂O ₃: ZrO ₂=5.4: 94.6 (mass ratioes);

Method for calcinating is adopted in modification usually, and the technological parameter of controlling in the calcination process is calcining heating rate, calcining heat and temperature retention time.Be about to powder and in electric furnace, press the heating rate of 3-15 ℃/min, be heated to 750-1000 ℃ of insulation 0.5-20h.Impel particle to grow up, the powder specific surface is reduced to 12m ²Below/the g.And then carry out mist projection granulating.The apparent density of the powder that granulation is good is 1.2g/cm ³, stocking angle is less than 30 °.

(2) select suitable binder for use

Press PP: EVA: PE: PW=1-7: 1-6: 1-7: the ratio preparation binding agent of 1-8 (PP-polypropylene, EVA-ethylene-vinyl acetate copolymer, PE polyethylene, PW-paraffin), after melting the mixing cooling, carry out mechanical crushing again.In 18: 82 ratios, under 80-150 ℃, carry out mechanical mixture in the yttrium stable zirconium oxide after binding agent and the modification (YSO-3.0), carry out fragmentation after the cooling.The injection material that crushes is carried out granulation in Granulation Equipments, particle is the granule less than 4 * 4 * 4mm.

(3) injection moulding and burning till

Injection moulding, forming temperature are 110-160 ℃, and briquetting pressure is 3-20Mpa, and molding time is 2-10s.The goods that injection is good are put into airtight electric furnace, and blowing air was raised to 600 ℃ in 24-72 hour, degreasing.Goods after the final degreasing were 1400-1600 ℃ of insulation 1-3 hour.

The key technical indexes of the guide roller of making through process conditions provided by the invention:

Density:＞5.9g/cm ³

Bending strength:＞900MPa

Hardness: HRA＞88

Advantage of the present invention is:

1. product surface of the present invention is highly polished, and the surface is difficult for producing burr, can prolong component life greatly.

2. the hardness of product of the present invention can reach HRA88, can satisfy the needs of high speed lead

3. because the batch mixing of this product is even, so biscuit density height, the density of burning till product is also greater than 5.9g/cm ³

The specific embodiment

By following embodiment, further illustrating substantive distinguishing features of the present invention and obvious improvement, but the present invention absolutely not only is confined to described embodiment.

Now details are as follows respectively with it:

Embodiment one

1. with powder heating rate by 3 ℃/min in electric furnace, be heated to 800 ℃ of insulation 5h.Impel particle to grow up, the powder specific surface is reduced to 12m ²Below/the g.And then carry out mist projection granulating.The apparent density of the powder that granulation is good is 1.2g/cm ³, stocking angle is less than 30 °.

2. press PP: EVA: PE: PW=5: the ratio preparation binding agent of 5: 5: 5 (PP-polypropylene, EVA-ethylene-vinyl acetate copolymer, PE polyethylene, PW-paraffin), after melting the mixing cooling, carry out mechanical crushing again.Press binding agent and yttrium stable zirconium oxide (Y ₂O ₃: ZrO ₂=5.4: 94.6) in 18: 82 ratios, under 140 ℃, carry out mechanical mixture, carry out fragmentation after the cooling.The injection material that crushes is carried out granulation in Granulation Equipments, the particle after the granulation is the granule less than 4 * 4 * 4mm.

3. injection moulding, forming temperature are 140 ℃, and briquetting pressure is 10MPa, and molding time is 3s.Degreasing: will inject good goods and put into airtight electric furnace, blowing air was raised to 600 ℃ in 72 hours.Sintering: the goods after the degreasing were 1500 ℃ of insulations 3 hours.

Embodiment two

1. with powder heating rate by 8 ℃/min in electric furnace, be heated to 900 ℃ of insulation 2h.Impel particle to grow up, the powder specific surface is reduced to 12m ²Below/the g.And then carry out mist projection granulating.The apparent density of the powder that granulation is good is 1.2g/cm ³, stocking angle is less than 30 °.

2. press PP: EVA: PE: PW=1: the ratio preparation binding agent of 3: 3: 5 (PP-polypropylene, EVA-ethylene-vinyl acetate copolymer, PE polyethylene, PW-paraffin), after melting the mixing cooling, carry out mechanical crushing again.Press binding agent and yttrium stable zirconium oxide (Y ₂O ₃: ZrO ₂=5.4: 94.6) in 18: 82 ratios, under 130 ℃, carry out mechanical mixture, carry out fragmentation after the cooling.The injection material that crushes is carried out granulation in Granulation Equipments, granular size is the granule less than 4 * 4 * 4mm.

3. injection moulding, forming temperature are 130 ℃, and briquetting pressure is 15MPa, and molding time is 4s.Degreasing: will inject good goods and put into airtight electric furnace, blowing air was raised to 600 ℃ in 48 hours.Sintering: the goods that degreasing is good are incubated 2 hours at 1550 ℃.

Claims

1. the guide roller manufacture method that the injection molding technique zirconia material is made is characterized in that (1) commercially available nanometer scale zirconia material adopts the method for calcinating modification, and (2) binding agent is selected and be mixed, the selection of (3) injection moulding and sintering process.

2. press the guide roller manufacture method that the described injection molding technique zirconia material of claim 1 is made, it is characterized in that it is 3-15 ℃/min that commercially available nanometer scale powder adopts the heating rate of method for calcinating modification, calcining heat 750-1000 ℃, insulation 0.5-20h.

3. the guide roller manufacture method of making by the described injection molding technique zirconia material of claim 1 is characterized in that

(1) in the YSZ-3.0 powder after binding agent and the modification in 18: 82 ratios, 80-150 ℃ of mechanical mixture, pulverize cooling back, last granulation;

(2) binding agent proportioning PP: EVA: PE: PW=1-7: 1-6: 1-7: 1-8.

4. the guide roller manufacture method of making by the described injection molding technique zirconia material of claim 3 is characterized in that the granulation for powders that mixes with binding agent is to carry out in Granulation Equipments, and particle is the granule less than 4 * 4 * 4mm.

5. by the guide roller manufacture method of the described injection molding technique zirconia material making of claim 1, forming temperature is 110-160 ℃ when it is characterized in that injection moulding, and pressure is 3-20MPa, molding time 2-10s, and degreasing is to be raised to 600 ℃ at 24-72 hour.

6. the guide roller manufacture method of making by the described injection molding technique zirconia material of claim 5 is characterized in that degreasing is that blowing air carries out in airtight electric furnace.

7. the guide roller manufacture method of making by the described injection molding technique zirconia material of claim 1 is characterized in that the guide roller sintering condition after the degreasing is 1400-1600 ℃, is incubated 1-3 hour.