CN104942291B - A kind of hot-pressing sintering method of Ti 6Al 4V alloys - Google Patents
A kind of hot-pressing sintering method of Ti 6Al 4V alloys Download PDFInfo
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Abstract
The present invention relates to a kind of hot-pressing sintering method of Ti 6Al 4V alloys, it is characterised in that step is as follows：By 4 ~ 6:50 ~ 75 μm of 6 ~ 4 mass ratioes and 300 ~ 420 μm of Ti 6Al 4V alloyed powders are well mixed；It is placed in mould, by 5 ~ 10 DEG C/min of heating rate, in 1050 ~ 1200 DEG C, 30 ~ 50MPa of pressure of temperature, vacuum≤10‑3Under Pa, 40 ~ 60min is sintered, that is, obtains powder metallurgy titanium alloy of the present invention.The inventive method is simple, and preparation technology is easy to control, can effectively reduce the cost of hot pressed sintering Ti 6Al 4V alloys, be advantageous to its market application.
Description
Technical field
The present invention relates to the hot pressing and sintering technique of alloy, in particular to a kind of hot-pressing sintering method of titanium alloy.
Background technology
Titanium is due to having the characteristics that specific strength height, corrosion resistance and good, biocompatibility is excellent is widely used in aviation
The industries such as space flight, bio-medical.But traditional titanium and its alloy work complex process, production cost is high, seriously hinders entering for titanium
Apply in one step market.Powder metallurgy can reduce production cost, it is so high to be particularly suitable for titanium as a kind of near-net-shape method
Expensive material.Therefore, the PM technique of titanium or titanium alloy turns into study hotspot at present.
The hi-tech industries such as Aero-Space, bio-medical are high to powder metallurgy titanium alloy performance requirement, and raw material need to typically be adopted
With the spherical titanium alloy powder of high-quality.Titanium due to preliminary work hardening rate it is high the characteristics of, compared using conventional moulded method
It is difficult to be densified.Especially spherical titanium alloy powder be even more be difficult to be densified, at present typically using high temperature insostatic pressing (HIP) method carry out into
Shape consolidates, and cost is very high.Hot-press method is shaped along with consolidation as high temperature insostatic pressing (HIP) method, suitable for sintered, spherical titanium
Alloy powder, but cost is low.
The content of the invention
The purpose of the present invention is to solve the shortcomings of the prior art part, there is provided a kind of with excellent combination mechanical property
The hot-pressing sintering method of Ti-6Al-4V alloys.
The purpose of the present invention is achieved through the following technical solutions：By 4 ~ 6:50 ~ 75 μm of 6 ~ 4 mass ratioes and 300 ~ 420 μm
Ti-6Al-4V alloyed powders be well mixed；Alloyed powder is placed in mould, by 5 ~ 10 DEG C/min of heating rate, temperature 1050 ~
1200 DEG C, 30 ~ 50MPa of pressure, vacuum≤10-3Under Pa, 40 ~ 60min is sintered, that is, obtains powder titanium of the present invention and closes
Gold.
Research is found, using the spherical Ti-6Al-4V powder of different-grain diameter, is entered using vacuum hot pressing methodology
Row sintering, when sintering temperature is more than 1100 DEG C, the consistency of sample reaches more than 98%, close to high temperature insostatic pressing (HIP)
Level, microscopic appearance are α-Ti+ β-Ti equiax crystal.Starting powder is thinner, and sintered sample crystallite dimension is smaller, the modeling of sintered sample
Property is better.It it is 1100 DEG C in sintering temperature, under conditions of heating rate is 6 DEG C/min, soaking time is 60min, when particle diameter is
When 50 ~ 75 μm (200 ~ 270 mesh), sample elongation percentage is 15.2%.When particle diameter increases to 300 ~ 420 μm (40 ~ 50 mesh), sample
Elongation percentage only has 3.9%, is brittle fracture, cannot function as structural material use substantially.
Research be also found, 50 ~ 75 μm of fine powder is added in 300 ~ 420 μm of coarse powder by a certain percentage, can form fine grain
With the microstructure of coarse-grain mixing, its plasticity, level of the elongation percentage close to pure fine powder sintered products are greatly improved.If it is less than this
Proportion, then it is little to the performance improvement of coarse powder sintered products.For the spherical Titanium Powder of high-quality, thinner preparation cost
It is higher.For example the price of 50 ~ 75 μm of powder is more than 10 times of 300 ~ 420 μm of powder.Hot pressed sintering, raw material are carried out using pure fine powder
Cost can be very high, causes product to lack the market competitiveness.If by the spherical Titanium Powder of high-quality using thickness collocation mixing, system
Powder metallurgy titanium alloy is obtained close to the performance of pure fine powder sintered products, and the cost of product can be greatly reduced, is had great importance.
The principle of preparation method of the present invention is：Ti-6Al-4V coarse powder and fine powder are mixed by a certain percentage, due to coarse powder
Crystal grain it is bigger than fine powder, this starting powder grain size difference can corresponding heredity in the crystal grain of sintered products, finally
Form the microstructure of coarse-grain and fine grain mixing.By regulating and controlling the ratio of coarse powder and fine powder, sintered products coarse-grain and thin can control
Brilliant content, so as to influence the mechanical property of sintered products.This tissue compares single coarse structure, can greatly improve modeling
Property, intensity also increased.The inventive method is simple, and preparation technology is easy to control, can effectively reduce hot pressed sintering Ti-6Al-4V conjunctions
The cost of gold, is advantageous to its market application.
Brief description of the drawings
Fig. 1 is the metallograph of Ti-6Al-4V alloys prepared by embodiment 1.
Fig. 2 is the room temperature tensile stress-strain diagram of Ti-6Al-4V alloys prepared by embodiment 1.
Embodiment
By following examples and its accompanying drawing, the invention will be further described, but embodiments of the present invention are not limited only to
This.
Embodiment 1
50 ~ 75 μm and 300 ~ 420 μm of spherical Ti-6Al-4V powder is pressed 4:Graphite mo(u)ld is poured into after 6 ratio is well mixed
Tool.Mould is placed in vacuum sintering funace, is evacuated down to 10-3Pa, pressure 30MPa, heated up with 6 DEG C/min sintering rate
To 1100 DEG C, 60min is incubated.Ti-6Al-4V alloys are obtained after furnace cooling.Its consistency reaches 98.1%, room temperature tensile intensity
For 804MPa, elongation percentage 12.5%.
Embodiment 2
50 ~ 75 μm and 300 ~ 420 μm of spherical Ti-6Al-4V powder is pressed 5:Graphite mo(u)ld is poured into after 5 ratio is well mixed
Tool.Mould is positioned in vacuum sintering funace, is evacuated down to 10-3Pa, pressure 40MPa, with 10 DEG C/min sintering rate
1200 DEG C are warming up to, is incubated 50min.Ti-6Al-4V alloys are obtained after furnace cooling.Its consistency reaches 98.3%, room temperature tensile
Intensity is 810MPa, elongation percentage 13.9%.
Embodiment 3
50 ~ 75 μm and 300 ~ 420 μm of spherical Ti-6Al-4V powder is pressed 6:Graphite mo(u)ld is poured into after 4 ratio is well mixed
Tool.Mould is positioned in vacuum sintering funace, is evacuated down to 10-3Pa, pressure 50MPa, with 8 DEG C/min sintering rate liter
Temperature is incubated 60min to 1050 DEG C.Ti-6Al-4V alloys are obtained after furnace cooling.Its consistency reaches 98.3%, and room temperature tensile is strong
Spend for 814MPa, elongation percentage 14.5%.
Claims (2)
1. a kind of hot-pressing sintering method of Ti-6Al-4V alloys, it is characterised in that step is as follows：By 4~6:6~4 mass ratioes
50~75 μm and 300~420 μm of Ti-6Al-4V alloyed powders are well mixed；It is placed in mould, by heating rate 5~10
DEG C/min, in 1050~1200 DEG C, 30~50MPa of pressure of temperature, vacuum≤10-3Under Pa, 40~60min is sintered, that is, is obtained
Described Ti-6Al-4V alloys.
2. the hot-pressing sintering method of Ti-6Al-4V alloys according to claim 1, it is characterised in that 50~75 μm and 300~
420 μm of Ti-6Al-4V alloyed powders mass ratio is 4:6.
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| CN108326283A (en) * | 2018-02-02 | 2018-07-27 | 广东省材料与加工研究所 | A kind of preparation method of Ti-6Al-4V alloy parts |
| CN108326282B (en) * | 2018-02-02 | 2019-11-01 | 广东省材料与加工研究所 | A kind of powder injection forming Ti-6Al-4V alloy feeding and preparation method thereof |
| CN109079135B (en) * | 2018-08-09 | 2021-01-26 | 四川大学 | Method for preparing miniature ultrasonic motor stator based on multi-physical-field activated sintering |
| CN108941536B (en) * | 2018-08-09 | 2021-05-28 | 四川大学 | Near-net manufacturing method of titanium alloy micro part and micro ultrasonic motor rotor |
| CN110524000A (en) * | 2019-10-15 | 2019-12-03 | 江苏思睿迪快速制造科技有限公司 | A kind of preparation method of 3D printing medical titanium alloy dusty material |
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| US20060157543A1 (en) * | 2004-11-10 | 2006-07-20 | Stanley Abkowitz | Fine grain titanium-alloy article and articles with clad porous titanium surfaces |
| JP5617381B2 (en) * | 2010-06-28 | 2014-11-05 | セイコーエプソン株式会社 | Titanium sintered body and method for producing titanium sintered body |
| CN102703756B (en) * | 2012-05-08 | 2014-05-07 | 华南理工大学 | Preparation method of double-scale crystalline grain Ti-6Al-4V material |
| CN103551574B (en) * | 2013-10-28 | 2015-05-27 | 中南大学 | Powder metallurgy preparation method for nitrogenous titanium-based alloy |
| CN103572084B (en) * | 2013-10-28 | 2015-08-12 | 中南大学 | A kind of method for preparing powder metallurgy of oxygen containing titanium base alloy |
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Effective date of registration: 20221114 Address after: 510651 No. 363, Changxin Road, Guangzhou, Guangdong, Tianhe District Patentee after: Institute of new materials, Guangdong Academy of Sciences Address before: 510651 No. 363, Changxin Road, Guangzhou, Guangdong, Tianhe District Patentee before: Institute of materials and processing, Guangdong Academy of Sciences |
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