CN100395057C

CN100395057C - Production method of porous structure

Info

Publication number: CN100395057C
Application number: CNB2005100334840A
Authority: CN
Inventors: 洪居万; 骆长定; 郑景太; 吴荣源
Original assignee: Fuzhun Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Fuzhun Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2005-03-05
Filing date: 2005-03-05
Publication date: 2008-06-18
Anticipated expiration: 2025-03-05
Also published as: CN1827261A

Abstract

The present invention relates to a production method of a porous structure, which comprises: firstly, screening powder with different particle sizes; screening the powder into a plurality of portions with unequal particle sizes; selecting a portion or multiple portions of the powder for sintering according to actual requirements so as to form the porous structure meeting the requirements. When the method is utilized to produce the porous structure, the temperature and the sintering time which are required during the sintering are easy to control because the particle sizes and the proportion of all portions of powder are very specific.

Description

The manufacture method of loose structure

[technical field]

The invention relates to a kind of manufacture method of loose structure, particularly a kind of method of utilizing powder sintered manufacturing loose structure.

[background technology]

Present stage, for the higher electronic component of caloric value, people generally adopt the mode of heat pipe, radiating fin and radiator fan combination to dispel the heat.The low boiling hydraulic fluid that utilizes the inside heat pipe filling is in heat-generating electronic elements place (evaporation ends) heat absorption evaporation, move to radiating fin, at radiating fin place (condensation end) heat that heat-generating electronic elements produces is passed to radiating fin, utilize radiator fan that the heat that produces is taken away, finish heat radiation electronic component.Hydraulic fluid after the vaporization condenses into liquid in the condensation end heat release, and this liquid is back to evaporation ends under the effect of heat pipe wall portion capillary structure, enters next working cycles.This heat pipe has higher heat transfer efficiency and heat transfer rate, is bringing into play important effect in the electronic element radiating field.

The capillary structure of heat pipe is the key factor that influences properties of hot pipe, and traditional heat tube capillary structure generally is that mixture of powders is put into high temperature furnace sintering a period of time, and each powder is joined together to form.But, when utilizing this method to make capillary structure, because this mixture of powders contains the powder of multiple different-grain diameter, and the content of each particle size range powder is uncertain, the surface of required minimizing is can (SurfaceEnergy) uncertain when making sintering, thereby required energy is uncertain when making sintering, and then required temperature range is indeterminate when making this mixture of powders sintering, and very difficult definite in the time that each temperature range stops, make sintering temperature and sintering time wayward.If sintering temperature is crossed low or sintering time is too short, effectively combination between each powder.If sintering temperature is too high or sintering time is long, this mixture of powders will produce contraction, densified, the capillary structure inside that sintering is formed only have that minority do not interconnect than macrovoid, and then make this capillary structure can not satisfy the demand of high permeability and high capillary force.So, sintering temperature and the more manageable heat tube capillary structure of sintering time when industry wishes to seek a kind of sintering.

[summary of the invention]

Sintering temperature and the uppity deficiency of sintering time will illustrate the manufacture method of a kind of sintering temperature and the more manageable loose structure of sintering time with embodiment at this when making for overcoming above-mentioned capillary structure.

In this embodiment, described method is to sieve out earlier the powder of different-grain diameter size, add up powder proportion in this raw material of each particle size, these powder are divided into unequigranular some parts, required according to reality again, select a or many parts of powder, direct sintering or collocation back sintering according to a certain percentage, the loose structure that satisfies the demands with formation.

When utilizing this method to make loose structure, because the particle size and the shared quantity thereof of each part powder are comparatively clear and definite, the surface of required minimizing can be comparatively clear and definite when making sintering, thereby required temperature and time is more easy to control when making sintering.

[description of drawings]

Be further described in conjunction with the embodiments with reference to the accompanying drawings:

Fig. 1 is the flow chart of this loose structure manufacture method;

Fig. 2 is the normal distribution of each particle diameter powder proportion in the raw material;

Fig. 3 is the schematic diagram before the first embodiment sintering;

Fig. 4 is the schematic diagram behind the first embodiment sintering;

Fig. 5 is the schematic diagram before the second embodiment sintering;

Fig. 6 is the schematic diagram behind the second embodiment sintering.

[specific embodiment]

The manufacture method of this loose structure is used to make the capillary structure of heat pipe.Utilize this method can produce the capillary structure of the heat pipe that satisfies the different capacity demand.

See also Fig. 1, the manufacture method of this loose structure comprises the steps:

Raw material: this raw material comprises the powder that some particle size do not wait, and the particle size range of these powder is a higher value, and this particle size range is according to the difference of machining accuracy and difference.In the present embodiment, the particle size range of raw material is 20 to 220 sieve meshes (Mesh)." sieve mesh " is the number of the sieve aperture that had of sieve unit are, and how industry represents particle size by the powder of this standard screen with the sieve mesh of standard screen.Sieve mesh is big more, and the powder diameter of expression is more little.

Statistics: utilize the sieve method sieve to get raw material, make raw material differ less some standard screens by sieve mesh successively, the powder of different-grain diameter is made a distinction, and determine powder proportion in raw material of each particle diameter, obtain the normal distribution of each particle diameter proportion in this raw material, as shown in Figure 2.Sieve method is about to raw material successively by the ascending standard screen of sieve mesh, shakes standard screen this raw material is passed through, and stays the powder that powder on the sieve is this standard screen representative particle diameter.

Subregion: please continue to consult Fig. 2,, be divided into different some part of particle size range with different separating this raw material that distinguishes of naming a person for a particular job according to the size of required processing heat pipe power and the difference of power.In the present embodiment, it is divided into five parts of A, B, C, D, E, respectively with 200Mesh, 140Mesh, 100Mesh and 40Mesh for separating a little, make the particle size range of five parts of A, B, C, D, E be respectively 200～220Mesh, 140～200Mesh, 100～140Mesh, 40～100Mesh, 20～40Mesh.

Choose: according to the size of required heat pipe power is that the performance of required capillary structure is chosen powder, and selected powder is arranged in pairs or groups according to a certain percentage.For large power heat pipe, choose behind the sintering permeability and all bigger powder of capillary force and arrange in pairs or groups.For the small-power heat pipe, can choose permeability or the less relatively powder of capillary force behind the sintering.

Sintering: selected powder is carried out sintering, satisfy the capillary structure of this heat pipe power demand with formation.

The manufacture method of this loose structure can be selected a or many parts of powder, as selecting C district's powder or B, D district powder or B, C, D district powder etc.When being elected to majority part powder, need arrange in pairs or groups according to a certain percentage.Be that example is introduced to select B, D district powder 4,2 (please refer to Fig. 3) below.

As shown in Figure 2, the particle size range of B,

D district powder

4,2 is respectively 140～200Mesh and 40～100Mesh, the particle size of D district powder 2 is compared greatly with the particle diameter of B district powder 4, this B,

D district powder

4,2 according to D weight/B heavy=5～20 weight ratio arranges in pairs or groups.

As shown in Figures 3 and 4, when this B,

D district powder

4,2 mixes, B district small particle diameter powder 4 be deposited in the big particle diameter powder 2 in D district around.Because the surface of B district small particle diameter powder energy (Surface Energy) is bigger, the required surface that reduces can be less during its sintering, so its sintering temperature is for the sintering temperature of independent use D district powder 2, and is relatively low.When carrying out sintering, B district powder 4 can be joined together to form D district powder 2 constriction (Necking) and disappear under a lower temperature, increase the neck area of adjacent D district powder 2 simultaneously, each D district powder 2 behind a sintering ' formation hole 6, the hole that this hole 6 selects for use D district powder 2 sintering to form more separately is little, have higher penetration and capillary force, make this mixed-powder easily control sintering at a lower temperature and form capillary structure with higher penetration and capillary force.

Select more than two parts can to control the capillary structure that forms the different aperture size at a lower temperature when powder sintered, make this capillary structure have certain capillary gradient, make this capillary structure have higher penetration and capillary force, help the raising of properties of hot pipe.

Select a when powder sintered, each powder can produce constriction equally and link together in sintering process, as Fig. 5 and shown in Figure 6, for selecting the schematic diagram of powder sintered front and back, C district separately, the particle size range of C district powder is 100～140Mesh, after this C district is powder sintered, between each powder, form a hole 6 more bigger than the hole among Fig. 46 ', make the capillary force of the capillary structure that forms behind the sintering compare decline to some extent with the capillary force of the capillary structure of selecting B,

D district powder

4,2 to form.

If the particle diameter of this part powder is bigger, temperature required during sintering is higher, but because the particle size and the quantity of this part powder are comparatively definite, the surface of required minimizing can be comparatively clear and definite when making sintering, so temperature and time required during sintering is still more easy to control.

When utilizing this method to make the capillary structure of heat pipe, because the particle size and the shared quantity thereof of each part powder are more definite, the surface of the powder that changes when making sintering can be comparatively clear and definite, thereby make its sintering temperature and sintering time more easy to control.When utilizing this method to make the capillary structure of identical or different power heat pipe, but the reasonable distribution powder carries out multiple different selection, and raw material is utilized effectively, and saves the manufacturing cost of heat pipe.

The raw material of the various embodiments described above is powder of homogenous material, and this manufacture method also can be chosen the powder of different materials, as chooses powder such as copper, nickel, stainless steel, pottery.

Claims

1. the manufacture method of a loose structure comprises the steps:

Supply raw materials, this raw material comprises the powder that some particle size do not wait, and these powder are divided into some parts according to different particle size range, and this step of supplying raw materials comprises powder proportion in this raw material of adding up each particle size;

Choose, choose a or many parts of powder;

Sintering carries out sintering with selected powder, forms required loose structure.

2. the manufacture method of loose structure as claimed in claim 1 is characterized in that: this raw material be copper powder or nickel powder or stainless steel powder or ceramic powder at least one of them.

3. the manufacture method of loose structure as claimed in claim 1 is characterized in that: this step of supplying raw materials is to utilize sieve method that raw material is divided into some parts.

4. the manufacture method of loose structure as claimed in claim 1, it is characterized in that: this is chosen in the step, when choosing many parts of powder, needs according to certain ratio collocation.

5. the manufacture method of a loose structure comprises the steps:

Raw material provides to comprise that some particle size do not wait the raw material of powder;

Statistics is added up the powder proportion of each particle size in this raw material;

Subregion is divided into some parts with this raw material according to different particle size range;

Choose, choose a or many parts of powder;

Sintering carries out sintering with selected powder, to process required loose structure.

6. the manufacture method of loose structure as claimed in claim 5, it is characterized in that: this statistic procedure further comprises utilizes sieve method that raw material is made a distinction according to different particle size.

7. the manufacture method of loose structure as claimed in claim 5, it is characterized in that: this is chosen in the step, when choosing many parts of powder, needs according to certain ratio collocation.