CN101555132B

CN101555132B - Sand glue for preventing blank from adhesion, preparation and application thereof

Info

Publication number: CN101555132B
Application number: CN200910050413XA
Authority: CN
Inventors: 赵恩起
Original assignee: HUAYUAN MAGNETIC INDUSTRY Co Ltd SHANGHAI
Current assignee: Shanghai Huayuan magnetic industry Limited by Share Ltd
Priority date: 2009-04-30
Filing date: 2009-04-30
Publication date: 2012-02-29
Anticipated expiration: 2029-04-30
Also published as: CN101555132A

Abstract

The invention belongs to the field of soft magnetism processing, and in particular relates to sand glue for preventing a product from adhesion in a ferrite manufacturing process, preparation and application thereof. The sand glue for prevent the blank from adhesion is suspension liquid, wherein the disperse phases of the suspension liquid is one or more of pulverized corundum, zirconium oxide powder or high alumina powder; and the dispersion medium of the suspension liquid is PVA aqueous solvent. The ferrite product cannot be adhered, can be easily separated, has low cost, and is simple and easy for operation through application of the sand glue.

Description

Prevent that the blank adhesion is with sand glue and preparation and application

Technical field

The invention belongs to field of soft magnetism processing, be specifically related to prevent in the ferrite manufacture process employed sand glue of product adhesion and preparation thereof and application.

Background technology

The ferrite magnetic material making technology is made green part with powder through press, passes through the moulding of nitrogen tunnel kiln sintering again.In order to increase output, sintering is put blank need pile up into kiln, and product meeting adhesion is difficult to behind the kiln discharge separately when piling up sintering, in separation process, is prone to cause breakage, like phenomenons such as unfilled corner, fleshiness, distortion, has a strong impact on qualification rate.Do not record as yet in the prior art where method can solve the problems of the technologies described above.

Summary of the invention

In order to solve technical problem of the prior art, the invention discloses a kind of sand glue and preparation thereof and use.

Of the present inventionly prevent that the blank adhesion from using sand glue to be suspension, the decentralized photo of suspension is one or more in emergy, zirconia powder or the high-alumina fly, and the dispersion medium of suspension is PVA (polyvinyl alcohol) aqueous solution.

Wherein, the granularity of emergy, zirconia powder or high-alumina fly is 40～120 orders.

Further, the mass ratio of the PVA aqueous solution and decentralized photo is 1: (0.5～2).

Further, in the PVA aqueous solution, the mass ratio of PVA and water is 1: (9～15).

Said emergy is the particle of corundum, and the main component of corundum is an aluminium oxide.The main component of said high-alumina fly also is an aluminium oxide.

Sand glue of the present invention can adopt following method preparation:

Under the condition of heating,, that emergy, zirconia powder or high-alumina fly and PVA aqueous solution is even with the water-soluble PVA aqueous solution that makes of PVA.

Sand glue of the present invention can be used for preventing in the ferrite manufacturing process product adhesion.

The present invention also further discloses the method that in a kind of ferrite manufacture process, prevents the product adhesion, comprises the following steps:

Nitrogen in the ferrite green into the kiln before the aforementioned sand glue coating raw bear grudge when superimposed on the contact surface.

Coating can be adopted conventional coating method.The thickness of coating is unsuitable blocked up, and about 0.15-0.5mm is advisable.

Because blank is uneven, for the ease of efficiently coating fast, the present invention has also further improved coating method: earlier sand glue is coated earlier on the screen cloth, the screen cloth that will scribble sand glue is again patted the blank surface.Changing method can be so that be coated with an amount of sand glue on the contact-making surface in green compact when stack.

Sand glue of the present invention can make and be prone to adhesion behind the product sintering in the ferrite manufacture process separately that phenomenons such as unfilled corner, fleshiness, distortion have obtained improvement, improve qualification rate, and cost are low, and are simple.

Description of drawings

Fig. 1: the screen cloth that has sand glue

Fig. 2: green compact stack sketch map

Embodiment

Below enumerate instantiation with further elaboration the present invention, should be understood that instance is not to be used to limit protection scope of the present invention.

The PVA that is adopted is that Kuraray company of Amada Co., Ltd. produces, and its physics and chemistry spy is to like following table:

Trade mark name	Sticking 10-3Pa*3 (=cps)	Alcoholysis degree Mole%	Fugitive constituent %Max	ph
					PVA-117	25～31	98～99	5.0	5～7

The preparation of embodiment 1 sand glue

Prepare sand glue as follows:

1) takes by weighing ionized water 9Kg and be poured in the container, take by weighing PVA1Kg then and pour in the water and stir, do not stop to stir and dissolve fully being heated to 98 ℃ up to PVA.

2) get PVA solution 1Kg, take by weighing 100 order emergy 1Kg and put in the same container and stir, process the sand glue suspension.

The preparation of embodiment 2 sand glues

Prepare sand glue as follows:

1) takes by weighing ionized water 12Kg, take by weighing PVA1Kg simultaneously and put into water, be heated to 95 ℃, stir simultaneously until the PVA particle and dissolve fully.

2) get PVA solution 1Kg, take by weighing 80 order emergy 0.5Kg, put in the same container, stir, process the sand glue suspension.

The preparation of embodiment 3 sand glues

Prepare sand glue as follows:

1) takes by weighing ionized water 15Kg, take by weighing PVA1Kg simultaneously and put into water, be heated to 95 ℃, stir simultaneously until the PVA particle and dissolve fully.

2) get PVA solution 1Kg, take by weighing 40 order zirconia powder 2Kg, put in the same container, stir, process the sand glue suspension.

The preparation of embodiment 4 sand glues

Prepare sand glue as follows:

1) takes by weighing ionized water 10Kg, take by weighing PVA1Kg simultaneously and put into water, be heated to 95 ℃, stir simultaneously until the PVA particle and dissolve fully.

2) get PVA solution 1Kg, take by weighing 120 height of eye aluminium powder 0.8Kg, put in the same container, stir, process the sand glue suspension.

The application of embodiment 5 sand glues

1, with neat the coming on the supporting plate that make progress of ferrite green compact pin;

2, dip in the sand glue of getting arbitrary prescription among the embodiment 1-4 with hairbrush, be coated in uniformly on screen cloth as shown in Figure 1;

3, pat gently on product with the screen cloth that scribbles sand glue, make and all coat on the sand glue cloth uniformly on the pin of product;

4, then with neat being placed on push pedal or the load bearing board of green compact;

5, repeat 4,5,6 operations, green compact are deposited in together, as shown in Figure 2, the number of plies is looked product and is decided.

6, go into the klining knot.

Comparative Examples: with upwards neat folded the coming on the supporting plate of ferrite green compact pin, do not use sand glue, go into the klining knot at each interlayer.

After sintering, the use of parts not bear grudge sand glue adhesion, easy to separate, chipping, and more meat, deformation phenomena gained access to improved, with a pass rate of 99%, without the use of glue parts sand adhesions, chipping, and more meat, deformation phenomena more, pass rate was 70%.

Claims

1. one kind prevents that the blank adhesion from using sand glue; Be suspension, the decentralized photo of said suspension is one or more in emergy, zirconia powder or the high-alumina fly, and the dispersion medium of suspension is the PVA aqueous solution; The granularity of said emergy, zirconia powder or high-alumina fly is 40～120 orders; The mass ratio of the said PVA aqueous solution and decentralized photo is 1: (0.5～2), in the said PVA aqueous solution, the mass ratio of PVA and water is 1: (9～15).

2. prevent according to claim 1 that the blank adhesion is used for the ferrite manufacturing process with sand glue.

3. prevent the method for product adhesion in the ferrite manufacture process, for before the ferrite green compact are gone into the nitrogen kiln, on the contact-making surface when the said sand glue of claim 1 is coated on the green compact stack.

4. as preventing the method for product adhesion in the said ferrite manufacture process of claim 3, it is characterized in that the sand glue coating thickness is 0.15-0.5mm.

5. as preventing the method for product adhesion in the said ferrite manufacture process of claim 3, it is characterized in that following manner is adopted in the coating of said sand glue: earlier sand glue is coated earlier on the screen cloth, the screen cloth that will scribble sand glue is again patted the blank surface.