CN101328551A

CN101328551A - Titanium alloy material producing no spark by friction

Info

Publication number: CN101328551A
Application number: CNA2007100117725A
Authority: CN
Inventors: 李阁平; 李长富; 杨义; 徐锋
Original assignee: Institute of Metal Research of CAS
Current assignee: Institute of Metal Research of CAS
Priority date: 2007-06-19
Filing date: 2007-06-19
Publication date: 2008-12-24

Abstract

The invention provides a titanium alloy material without friction spark. The titanium alloy material is characterized in that the titanium alloy material consists of the following alloy elements in weight percentage: 5.0 to 6.8 percent of Al, 2 to 4 percent of Sn, 2 to 6 percent of Zr, 1 to 25 percent of one or a plurality of Cu, Ni, Mn, Cr, Be and Ag, 1 to 10 percent of one or two of V and Mo, 0 to 0.5 percent of Si, and the balance being Ti. The titanium alloy material of the invention has obviously better performances of heat resistance, corrosion resistance, fire resistance and friction sparking resistance, good room temperature or high temperature mechanical performances and foreseeable long-term economic benefits, military values and significant political significance.

Description

A kind of titanium alloy material of producing no spark by friction

Technical field:

The present invention relates to flame resistant, heat-resisting, corrosion resistant Ti alloy novel material, providing a kind of does not especially have spark to produce with other material high-speed friction the time, and can be at the titanium alloy material of 500 ℃ of life-time service.

Background technology:

Under certain cooperation of air, pressure, temperature; oxidizing reaction takes place in titanium alloy spare surface; stereomutation; cause former zone of oxidation to be broken, lose provide protection, a large amount of oxygen and titanium alloy react; the heat that reaction discharges surpasses dissipated heat; temperature raises fast and causes igniting and burning, thereby causes at each position of equipment and to catch fire, and this accident is called as " titanium fire " accident in the prior art.It is a big technical barrier that needs to be resolved hurrily.

The eighties mid-term, the U.S. develops Alloy C alloy, is also referred to as Ti-1270.This alloy belongs to beta titanium alloy, and its main component is Ti-V-C.Result of study shows that Alloy C alloy at room temperature tensile strength and Ti-6242 alloy phase are worked as, yet the high temperature tensile strength of Alloy C alloy but obviously is better than the Ti-6242 alloy.Alloy C alloy can be made slab, thin plate, band, foil and bar, and rolling and welding annular element.Russia starts with from friction mechanism, develops two kinds of fire-retardant titanium alloys of BTT-1 and BTT-3, and they all are that Ti-Al-Cu is an alloy.Bar, forging and annular element have been produced at present.

No matter be Alloy C alloy or BTT-1 and BTT-3 alloy, when rubbing with emery wheel, can produce bright spark (seeing Fig. 1,2), consider from incendive source, " titanium fire " is still inevitable.

Therefore, people expect to obtain flame resistant, heat-resisting, the corrosion resistant Ti alloy novel material that a kind of technique effect is better than prior art, especially do not have spark to produce with other material high-speed friction the time, and can be at the titanium alloy material of life-time service under the comparatively high temps.

Summary of the invention:

The purpose of this invention is to provide a kind of flame resistant, heat-resisting, corrosion resistant Ti alloy novel material, providing a kind of does not especially have spark to produce with other material high-speed friction the time, and can be at the titanium alloy material of 500 ℃ of life-time service, its 500 ℃ of high-temperature behaviors are good, temperature-room type plasticity is good, have good heat processing technique plasticity simultaneously.

The invention provides a kind of titanium alloy material of producing no spark by friction, it is characterized in that: described titanium alloy material is by forming in the following alloying element: the Al element: weight content is 5.0%～6.8%; The Sn element: weight content is 2%～4%; The Zr element: weight content is 2%～6%; One or more of Cu, Ni, Mn, Cr, Be, Ag element: weight content is 1%～25%; One or both of V, Mo element: weight content is 1%～10%; The Si element: weight content is 0.0%～0.5% (the further preferable range of the weight content of Si element is 0.2%～0.5%); Ti element: surplus.

In order to realize that the ability of spark does not appear in titanium alloy when rubbing, guarantee enough room temperature mechanicals behavior under high temperature, the present invention has specifically developed a kind of flame resistant titanium alloy that has 500 ℃ of high-temperature behaviors concurrently from the alloying angle.

Specifically, heat-resisting in order to make, anti-corrosion, flame resistant titanium alloy reaches corresponding friction resistant performance on fire, room temperature, mechanical behavior under high temperature coupling, when alloy designs, consider (being described as follows with corresponding content requirement) at each composition in the preferable range from following several aspects:

After Al and Ti form sosoloid, mainly be distributed in α mutually in, can obviously improve the hot strength of alloy, as long as Al content is controlled within the solid solubility limit, can obviously not reduce the toughness of alloy.Al and Sn are the α stable element, and Al is more stronger than Sn effect in this respect, and it is better that the two is used the High-Temperature Strengthening effect.The density of Al is low in addition, on loss of weight, raising Young's modulus, acts on also very remarkable.The fusing point of Al and Sn is all lower, and titanium alloy flame resistant performance is not had tangible benefit, and main collateral security alloy thermotolerance aspect considers that the suitable add-on of Al and Sn preferably is respectively 5.0%～6.8% and 2%～4%.

Si is the common element of high-temperature titanium alloy, is combined into silicide with Ti, and is obvious for the effect of raising alloy high-temp durable creeping performance, but content too much can reduce temperature-room type plasticity, especially impelling strength.Because Si content is general to add and is less than 0.5% and can resist combustionproperty and play obvious effect, so the content of Si element is consistent with normal high-temperature titanium alloy, preferably in 0.2%～0.5% scope.

Zr is the indifferent equilibrium element, can improve hot strength on the basis that does not reduce plasticity, is the important element that improves the alloy resistance toheat.Zr is the same with Ti, is easy to produce fire by friction, if too much add, is unfavorable for improving the flame resistant performance.Experiment shows, the preferred suitable add-on of Zr is 2.0%～6.0% to be advisable.

V and Mo are beta stable elements, and V has certain solubleness in two-phase, the ability of stablizing the β phase a little less than, the general selection share with other beta stable element; Mo has very strong stable β phase ability, strengthens the resistance of oxidation of alloy simultaneously.V is favourable to process plastic and flame resistant performance with the interpolation of Mo: increase β share mutually on the one hand in alloy, adjust alloy prior plasticity, the effect that improves room temperature strength to playing in the heat-resistant titanium alloy; In the alloy combustion processes, the products of combustion of vanadium and molybdenum is overflowed with the gas phase form in a large number on the other hand, and this process will be absorbed heat, and the belt zone of rich vanadium in while rhegmalypt edge and chromium has further suppressed combustion reactions and spread.The molten barrier film that forms by Ti, V, Mo oxide compound, play oxygen barrier, heat insulation, every the effect of combustionmaterial, this is to contain the reason that V, Mo alloy can be fire-retardant, the mechanism of action is seen synoptic diagram 3, fire retardant mechanism is specifically: form the fire-retardant film of spontaneous fusion, be characterized in having levelling property and homogeneity.Select one or both uses of V, Mo element as the case may be, weight content is preferably 1%～10%.

The interpolation of Cu and Ni mainly is to consider from the angle of Metallkunde.Copper has good thermal conductivity, and the content of copper is 17% o'clock in the alloy, can form the eutectic (see figure 4) in the time of 955～990 ℃, promptly liquid phase occurs and serves as lubricant, and metal to-metal contact is converted into wet friction, effectively reduces frictional force and heat; The raising of while owing to the solubility with temperature of copper changes, and the content that forms copper on the interface between cold metal and the combustion zone exceeds 2～4 times rich copper barrier layer, thereby stops alloy to oxygen absorption, stops burning to be proceeded.

Eutectic reflection (see figure 5) can take place, L-(β Ti)+Ti at 24% o'clock in Ni in the time of 942 ℃ ₂Ni promptly liquid phase occurs and obviously reduces frictional coefficient and wear rate, plays friction resistant effect on fire.The adding of Cu and Ni has improved β volume fraction mutually in the alloy, help improving alloy at room temperature plasticity and process plastic, but can reduce the high-temperature behavior of material, alloy content will be controlled under the basic demand prerequisite that guarantees 500 ℃ of mechanical properties, reaches friction resistant function on fire.Elements such as Mn, Cr, Be, Ag can improve alloy friction resistant ability on fire with Cu, Ni element, and improve alloy strength.Test-results shows, particular case is selected one or more of Cu, Ni, Mn, Cr, Be, Ag element, and weight content is 1%～25% to be advisable.

In terms of existing technologies, the present invention has obviously better heat-resisting, anti-corrosion, flame resistant, friction resistant performance on fire, good room temperature or mechanical behavior under high temperature.We are starting point with China's existence conditions, by composition is analysed in depth, develop with legacy equipment and technology and can produce, and have the producing no spark by friction titanium alloy material of independent intellectual property rights; It has foreseeable comparatively long-range economic benefit, military value and deep political meaning.

Description of drawings:

Spark photo when Fig. 1 is U.S.'s Alloy C alloy and the friction of high speed rotating emery wheel;

Spark photo when Fig. 2 is Russian BTT-1 alloy and the friction of high speed rotating emery wheel;

Fig. 3 is for containing V, Mo titanium alloy fire retardant mechanism synoptic diagram;

Fig. 4 is the Ti-Cu binary phase diagram;

Fig. 5 is the Ti-Ni binary phase diagram;

Spark photo when Fig. 6 friction resistant of the present invention titanium alloy on fire and the friction of high speed rotating emery wheel.

Embodiment:

Below by example in detail the present invention is described in detail:

Embodiment 1

A kind of anti-corrosion friction resistant titanium alloy on fire, alloying constituent is as shown in table 1.Alloy is selected the two-phase region finish-forging, and two-phase region process of thermal treatment route obtains primary at the bifurcation tissue more than 30%, and the mechanical property after the alloy thermal treatment the results are shown in Table 2.

Table 1: alloying constituent

Show 2:500 ℃ of heat-resistant titanium alloy mechanical property

Embodiment 2

A kind of anti-corrosion, friction resistant titanium alloy on fire, alloying constituent is as shown in table 3.

Table 3: alloying constituent

Alloy at room temperature, high temperature tensile properties see Table 4 after this alloy thermal treatment.Flame resistant, heat-resistant titanium alloy sample emery wheel friction sight are seen Fig. 6, and alloy shows good friction resistant spark and forms ability.

The mechanical property of 4:500 ℃ of heat-resistant titanium alloy of table

Embodiment 3

A kind of titanium alloy material of producing no spark by friction, described titanium alloy material is made up of following alloying element: the Al element: weight content is 6.0%; The Sn element: weight content is 3.2%; The Zr element: weight content is 4.5%; Cu, Ni, Mn, Cr, Be, Ag element wt content are respectively 1%; V element and Mo element: weight content is respectively 2%; The Si element: weight content is 0.35%; Ti element: surplus.

Embodiment 4

A kind of titanium alloy material of producing no spark by friction, described titanium alloy material is made up of following alloying element: the Al element: weight content is 5.0%; The Sn element: weight content is 2%; The Zr element: weight content is 6%; One or more of Cu, Ni, Mn, Cr, Be, Ag element: gross weight content is 1%; One or both of V, Mo element: gross weight content is 1%; The Si element: weight content is 0.5%; Ti element: surplus.

Embodiment 5

A kind of titanium alloy material of producing no spark by friction, described titanium alloy material is made up of following alloying element: the Al element: weight content is 6.8%; The Sn element: weight content is 4%; The Zr element: weight content is 2%; One or more of Cu, Ni, Mn, Cr, Be, Ag element: gross weight content is 25%; One or both of V, Mo element: gross weight content is 10%; Ti element: surplus.

Claims

1, a kind of titanium alloy material of producing no spark by friction is characterized in that: described titanium alloy material is by forming in the following alloying element:

The Al element: weight content is 5.0%～6.8%; The Sn element: weight content is 2%～4%; The Zr element: weight content is 2%～6%; One or more of Cu, Ni, Mn, Cr, Be, Ag element: weight content is 1%～25%; One or both of V, Mo element: weight content is 1%～10%; The Si element: weight content is 0～0.5%; Ti element: surplus.

2, according to the titanium alloy material of the described producing no spark by friction of claim 1, it is characterized in that: the weight content of Si element is 0.2%～0.5% in the described titanium alloy material.