CN101575687A - Preparation method of Al*O* short fiber reinforced composite prefabricated part - Google Patents

Preparation method of Al*O* short fiber reinforced composite prefabricated part Download PDF

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Publication number
CN101575687A
CN101575687A CNA2009100990941A CN200910099094A CN101575687A CN 101575687 A CN101575687 A CN 101575687A CN A2009100990941 A CNA2009100990941 A CN A2009100990941A CN 200910099094 A CN200910099094 A CN 200910099094A CN 101575687 A CN101575687 A CN 101575687A
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short fiber
preparation
prefabricated component
reinforced composite
prefabricated part
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CNA2009100990941A
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CN101575687B (en
Inventor
高明灯
侯林冲
彭银江
沈建明
朱秀荣
费良军
王荣
徐永东
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No 52 Institute of China North Industries Group Corp
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No 52 Institute of China North Industries Group Corp
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Abstract

The invention discloses a preparation method of an Al2O3 short fiber reinforced composite prefabricated part, which is characterized by comprising the following steps of: (1) pretreatment of Al2O3 short fiber; (2) drying of the Al2O3 short fiber; (3) fabrication of an Al2O3 short fiber prefabricated part; (4) drying of the Al2O3 short fiber prefabricated part; and (5) polishing of the Al2O3 short fiber prefabricated part: the Al2O3 short fiber reinforced composite prefabricated part is obtained after mechanical polishing. The invention improves the production efficiency, reduces the cost, eliminates environmental pollution through a mechanical liquid smashing device, adopts a method of vacuumized pressure filtration, and is easy to control the dimension.

Description

A kind of Al 2O 3The preparation method of short fiber reinforced composite prefabricated part
Technical field
The present invention relates to the standby technical field of composite materials of a kind of squeeze cast form legal system, relate in particular to Al 2O 3The preparation method of short fiber reinforced composite prefabricated part and technology.
Background technology
The extrusion casting method of forming is to be full of casting mold under pressure with being in liquid state or semi-solid melt, solidifies and the crystalline casting technique.Be characterized in that in part forming and process of setting, cast pressures partially or drift are in removable state, make part crystallization and produce certain distortion under pressure, obtain the tissue of tiny densification and higher mechanical property.
Adopt squeeze cast form to prepare Al 2O 3During short fiber reinforced composite, at first fortifying fibre is prefabricated into the fiber preform of definite shape, the fiber preform of making is preset in the mould die cavity, directly the pressurization of matrix alloy liquation is infiltrated again the space formation composite of prefabricated component by mold and punching head.
Al from domestic procurement 2O 3Short fiber is cotton-wool, and fiber is different in size, and the slag ball is more, can not be directly used in the preparation composite material prefabricated component.Therefore, make prefabricated component and must carry out the preliminary treatment of fiber before, be about to the Al that length differs, arranges in a jumble 2O 3Short fiber is crushed to needed length, and domestic common employing machinery crushing method is contained in short fiber in the mould and pressurizes, because fiber is more crisp, is pulverized under pressure.Though this method is simple, but can not make mixed and disorderly staple fibre uniform distribution in the time of owing to the dress mould, higher part damaged the getting terribly under pressure of tap density in the actually operating, and that tap density is stressed than lower part is little, the fiber fragmentation causes pulverizing back fiber length and differs greatly with regard to imperfection, is difficult to control, and fiber flies upward when pulverizing, and working conditions is very abominable.
Al 2O 3The quality of short fiber prefabricated component Forming Quality is one of key factor that affects composite property.The method of some common prefabricated component of unit of home and abroad is the pretreated fiber of crushing to be put into water stir, and adds a certain amount of binding agent, after mixing, pour in the prefabricated component mould, water is slowly oozed out, take out when certain intensity is arranged by the time air-dry, and then baking, processing.The prefabricated component degree of tightness rate of making like this is difficult to control, and the manufacturing cycle is very long, out-of-shape, and processing capacity is big, the manufacturing cost height, and be difficult to satisfy needs under the mass production environment.
Summary of the invention
Technical problem to be solved by this invention is to overcome the existing Al of prior art 2O 3The short fiber prefabricated component manufacturing cycle is long, out-of-shape, and processing capacity is big, and manufacturing cost height, and be difficult to satisfy the shortcoming of batch production provides a kind of manufacturing cycle short, and regular shape is processed less or is not had processing, low cost of manufacture, and satisfy the Al of batch production requirements 2O 3The preparation method of short fiber reinforced composite prefabricated part.
The present invention solves the problems of the technologies described above the technical scheme that adopts: a kind of Al 2O 3The preparation method of short fiber reinforced composite prefabricated part is characterized in that step is:
(1) Al 2O 3The preliminary treatment of short fiber: with Al 2O 3Short fiber is put into mechanical liquid smashing device, adds water, and stirs and pulverizes and clean, and then draining adds water to stir again and pulverizes and clean, and is repeated several times, and pulls out at last;
(2) Al 2O 3The drying and processing of short fiber: with pretreated Al 2O 3Short fiber is put into baking oven and is toasted, 150～200 degrees centigrade of temperature, 15～20 hours time;
(3) Al 2O 3The short fiber prefabricated component is made: with Al 2O 3Short fiber and binding agent stir with mass ratio 1: 4～5 ratios, be poured in the mold cavity of prefabricated component, and the matched moulds pressurization, the mode of vacuumizing is taken out part water and binding agent, matched moulds pressurization pressure 20Mpa～30Mpa, 15～30 seconds dwell times, vacuum 1 * 10 -2More than the Pa, the die sinking pickup;
(4) Al 2O 3Short fiber prefabricated component drying and processing: 150～200 degrees centigrade of bake out temperatures, drying time 15～20 hours;
(5) Al 2O 3Short fiber prefabricated component grinding process: through mechanical grinding, obtain Al 2O 3Short fiber reinforced composite prefabricated part.
Al in the described pre-treatment step 2O 3Short fiber and water quality ratio are 1: 9～11.
Be repeated several times in the described pre-treatment step and adopt 2～3 times.
Stirring velocity adopts 80r/min～100r/min in the described pre-treatment step, and churning time 20min～40min needs to leave standstill 10～15min after the stirring.
Described binding agent adopts silicon sol.
Mechanical liquid smashing device is main shaft from lower and primary blades and auxiliary blade are set in the described pre-treatment step, accordingly, is arranged on the fixed blade on the fixed axis, in main shaft periphery, and transfixion, and cooperate with auxiliary blade.
Described Al 2O 3Short fiber specification limit diameter is less than 2 microns.
Compared with prior art, the invention has the advantages that:
Aspect the fiber preconditioning technique, adopt the mechanical liquid comminuting method, designed the staple fibre mechanical liquid smashing device, solved the staple length technology, enhance productivity, reduced manufacturing cost, eliminated environmental pollution.
In fiber making processes, adopt the method that vacuumizes press filtration to make fiber preform, the overall size and the voidage of fiber preform are controlled easily, regular shape, machining amount significantly reduces, and can realize few processing and not have processing, enhance productivity, reduced manufacturing cost.
Description of drawings
Fig. 1 is Al of the present invention 2O 3Short fiber mechanical liquid smashing device schematic diagram;
Fig. 2 is Al of the present invention 2O 3The fabrication processing figure of short fiber prefabricated component.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Concrete embodiment 1:
(1), Al 2O 3Short fiber pretreating: with Al 2O 3Short fiber is put in the mixing drum 6 of mechanical liquid smashing device, adds Al 2O 3The water that short fiber weight is 9 times is opened motor, and motor speed is transferred to 80r/min, and main shaft 1 drives primary blades 5 and auxiliary blade 3 rotations, and fixed axis 4 arranges fixed blade 2, transfixion, Al 2O 3Short fiber is under main shaft 1, primary blades 5, auxiliary blade 3, fixed axis 4, fixed blade 2 actings in conjunction, to Al 2O 3Short fiber is pulverized, and stirs 20min, leaves standstill 10min, and venting water adds running water again and cleans, and repeats twice, with Al 2O 3Short fiber is pulled out and is put into clean plate.
Wherein mechanical liquid smashing device is seen Fig. 1, and it is a main shaft 1 from down primary blades 5 and auxiliary blade 3 being set, and accordingly, is arranged on the stator blades 2 on the stationary shaft 4, in main shaft 1 periphery, and transfixion, and cooperate with auxiliary blade 3.
(2) Al 2O 3The drying and processing of short fiber: with pretreated Al 2O 3Short fiber is put into baking oven and is toasted, 150 degrees centigrade of temperature, 15 hours time;
(3) Al 2O 3The short fiber prefabricated component is made: the fiber after at first will pulverizing and dry through preliminary treatment, according to the geomery of prefabricated component and the voidage of selecting, calculate the needed Al of prefabricated component 2O 3The short fiber mass M is according to the quality of calculating, with the Al that weighs up 2O 3Short fiber is poured in the beaker, adds the binding agent that has mixed, its Al again 2O 3Short fiber and binding agent stir with 1: 4 ratio of mass ratio, be poured in the mold cavity of prefabricated component, and the matched moulds pressurization, the mode of vacuumizing is taken out part water and binding agent, matched moulds pressurization pressure 20Mpa, 15 seconds dwell times, vacuum 1 * 10 -2More than the Pa, the die sinking pickup;
(4) Al 2O 3Short fiber prefabricated component drying and processing: 150 degrees centigrade of bake out temperatures, drying time 15 hours;
(5) Al 2O 3Short fiber prefabricated component grinding process: through mechanical grinding, obtain Al 2O 3Short fiber reinforced composite prefabricated part.
Adopt this Method and process to make Al 2O 3Short fiber reinforced composite prefabricated part can obtain Al through the extrusion casint aluminising 2O 3Short fiber reinforced composite makes the composite short fiber and mixes, and does not have the group's of twining phenomenon, aluminium liquid and Al in the composite 2O 3The short fiber reinforcing material reaches more than the 280MPa, and has good anti-wear performance in conjunction with good, room temperature tensile strength.
Concrete embodiment 2:
(1), Al 2O 3Short fiber pretreating: with Al 2O 3Short fiber is put in the mixing drum 6 of mechanical liquid smashing device, adds Al 2O 3The water that short fiber weight is 10 times is opened motor, and motor speed is transferred to 90r/min, and main shaft 1 drives primary blades 5 and auxiliary blade 3 rotations, and fixed axis 4 arranges fixed blade 2, transfixion, Al 2O 3Short fiber is under main shaft 1, primary blades 5, auxiliary blade 3, fixed axis 4, fixed blade 2 actings in conjunction, to Al 2O 3Short fiber is pulverized, and stirs 30min, leaves standstill 15min, and venting water adds running water again and cleans, and repeats twice, with Al 2O 3Short fiber is pulled out and is put into clean plate.
(2) Al 2O 3The drying and processing of short fiber: with pretreated Al 2O 3Short fiber is put into baking oven and is toasted, 180 degrees centigrade of temperature, 18 hours time;
(3) Al 2O 3The short fiber prefabricated component is made: the fiber after at first will pulverizing and dry through preliminary treatment, according to the geomery of prefabricated component and the voidage of selecting, calculate the needed Al of prefabricated component 2O 3The short fiber mass M is according to the quality of calculating, with the Al that weighs up 2O 3Short fiber is poured in the beaker, adds the binding agent that has mixed, its Al again 2O 3Short fiber and binding agent stir with 1: 4 ratio of mass ratio, be poured in the mold cavity of prefabricated component, and the matched moulds pressurization, the mode of vacuumizing is taken out part water and binding agent, matched moulds pressurization pressure 25Mpa, 20 seconds dwell times, vacuum 1 * 10 -2More than the Pa, the die sinking pickup;
(4) Al 2O 3Short fiber prefabricated component drying and processing: 180 degrees centigrade of bake out temperatures, drying time 18 hours;
(5) Al 2O 3Short fiber prefabricated component grinding process: through mechanical grinding, obtain Al 2O 3Short fiber reinforced composite prefabricated part.
Adopt this Method and process to make Al 2O 3Short fiber reinforced composite prefabricated part can obtain Al through the extrusion casint aluminising 2O 3Short fiber reinforced composite makes the composite short fiber and mixes, and does not have the group's of twining phenomenon, aluminium liquid and Al in the composite 2O 3The short fiber reinforcing material reaches more than the 285MPa, and has good anti-wear performance in conjunction with good, room temperature tensile strength.
Concrete embodiment 3:
(1), Al 2O 3Short fiber pretreating: with Al 2O 3Short fiber is put in the mixing drum 6 of mechanical liquid smashing device, adds Al 2O 3The water that short fiber weight is 11 times is opened motor, and motor speed is transferred to 100r/min, and main shaft 1 drives primary blades 5 and auxiliary blade 3 rotations, and fixed axis 4 arranges fixed blade 2, transfixion, Al 2O 3Short fiber is under main shaft 1, primary blades 5, auxiliary blade 3, fixed axis 4, fixed blade 2 actings in conjunction, to Al 2O 3Short fiber is pulverized, and stirs 40min, leaves standstill 15min, and venting water adds running water again and cleans, behind the triplicate, with Al 2O 3Short fiber is pulled out and is put into clean plate.
(2) Al 2O 3The drying and processing of short fiber: with pretreated Al 2O 3Short fiber is put into baking oven and is toasted, 200 degrees centigrade of temperature, 20 hours time;
(3) Al 2O 3The short fiber prefabricated component is made: the fiber after at first will pulverizing and dry through preliminary treatment, according to the geomery of prefabricated component and the voidage of selecting, calculate the needed Al of prefabricated component 2O 3The short fiber mass M is according to the quality of calculating, with the Al that weighs up 2O 3Short fiber is poured in the beaker, adds the binding agent that has mixed, its Al again 2O 3Short fiber and binding agent stir with 1: 5 ratio of mass ratio, be poured in the mold cavity of prefabricated component, and the matched moulds pressurization, the mode of vacuumizing is taken out part water and binding agent, matched moulds pressurization pressure 30Mpa, 30 seconds dwell times, vacuum 1 * 10 -2More than the Pa, the die sinking pickup;
(4) Al 2O 3Short fiber prefabricated component drying and processing: 200 degrees centigrade of bake out temperatures, drying time 20 hours;
(5) Al 2O 3Short fiber prefabricated component grinding process: through mechanical grinding, obtain Al 2O 3Short fiber reinforced composite prefabricated part.
Adopt this Method and process to make Al 2O 3Short fiber reinforced composite prefabricated part can obtain Al through the extrusion casint aluminising 2O 3Short fiber reinforced composite makes the composite short fiber and mixes, and does not have the group's of twining phenomenon, aluminium liquid and Al in the composite 2O 3The short fiber reinforcing material reaches more than the 300MPa, and has good anti-wear performance in conjunction with good, room temperature tensile strength.

Claims (6)

1, a kind of Al 2O 3The preparation method of short fiber reinforced composite prefabricated part is characterized in that step is:
(1) Al 2O 3The preliminary treatment of short fiber: with Al 2O 3Short fiber is put into mechanical liquid smashing device, adds water, and stirs and pulverizes and clean, and then draining adds water to stir again and pulverizes and clean, and is repeated several times, and pulls out at last;
(2) Al 2O 3The drying and processing of short fiber: with pretreated Al 2O 3Short fiber is put into baking oven and is toasted, 150～200 degrees centigrade of temperature, 15～20 hours time;
(3) Al 2O 3The short fiber prefabricated component is made: with Al 2O 3Short fiber and binding agent stir with mass ratio 1: 4～5 ratios, be poured in the mold cavity of prefabricated component, and the matched moulds pressurization, the mode of vacuumizing is taken out part water and binding agent, matched moulds pressurization pressure 20Mpa～30Mpa, 15～30 seconds dwell times, vacuum 1 * 10 -2More than the Pa, the die sinking pickup;
(4) Al 2O 3Short fiber prefabricated component drying and processing: 150～200 degrees centigrade of bake out temperatures, drying time 15～20 hours;
(5) Al 2O 3Short fiber prefabricated component grinding process: through mechanical grinding, obtain Al 2O 3Short fiber reinforced composite prefabricated part.
2, preparation method according to claim 1 is characterized in that Al in the described pre-treatment step 2O 3Short fiber and water quality ratio are 1: 9～11.
3, preparation method according to claim 1 is characterized in that repeating in the described pre-treatment step repeatedly to adopt 2～3 times.
4, preparation method according to claim 1 is characterized in that stirring velocity adopts 80r/min～100r/min in the described pre-treatment step, and churning time 20min～40min needs to leave standstill 10～15min after the stirring.
5, preparation method according to claim 1 is characterized in that described binding agent adopts silicon sol.
6, preparation method according to claim 1, it is characterized in that mechanical liquid smashing device is that main shaft is from being provided with primary blades and auxiliary blade down in the described pre-treatment step, accordingly, be arranged on the stator blades on the stationary shaft, in main shaft periphery, transfixion, and cooperate with auxiliary blade.
CN 200910099094 2009-06-04 2009-06-04 Preparation method of Al2O3 short fiber reinforced composite prefabricated part Expired - Fee Related CN101575687B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102191443A (en) * 2011-05-16 2011-09-21 西安理工大学 Preparation method of alumina fiber reinforced magnesium-matrix composite
CN102424595A (en) * 2011-09-19 2012-04-25 南京理工大学常熟研究院有限公司 Preparation method of hard erosion resistant alumina fiberboard hearth material
GB2575615A (en) * 2017-04-04 2020-01-22 Eva Lind Susie Rollerball a machine and system of pumped storage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1118813A (en) * 1994-05-10 1996-03-20 武汉钢铁学院 Producing method for Al2O3 granules reinforced wear resistance composite material
JP2005042136A (en) * 2003-07-23 2005-02-17 Toyota Industries Corp Aluminum-matrix composite material and its manufacturing method
CN1212420C (en) * 2003-07-30 2005-07-27 张强 Method for manufacturing porous preformed component of short fiber-reinforced metal matrix composite product

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102191443A (en) * 2011-05-16 2011-09-21 西安理工大学 Preparation method of alumina fiber reinforced magnesium-matrix composite
CN102191443B (en) * 2011-05-16 2013-05-08 西安理工大学 Preparation method of alumina fiber reinforced magnesium-matrix composite
CN102424595A (en) * 2011-09-19 2012-04-25 南京理工大学常熟研究院有限公司 Preparation method of hard erosion resistant alumina fiberboard hearth material
GB2575615A (en) * 2017-04-04 2020-01-22 Eva Lind Susie Rollerball a machine and system of pumped storage

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