CN101852735A - Method for measuring titanium content of aluminum-titanium-boron alloy by using photoelectric direct reading emission spectrometer - Google Patents
Method for measuring titanium content of aluminum-titanium-boron alloy by using photoelectric direct reading emission spectrometer Download PDFInfo
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Abstract
The invention relates to a method for measuring the titanium content of an aluminum-titanium-boron alloy by using a photoelectric direct reading emission spectrometer. The method comprises the following steps of: setting appropriate shooting parameters, such as argon input pressure, flushing time, pre-burning time, exposure time and the like for the emission spectrometer and drawing a first working curve by selecting an analysis line pair of 395.821/266.039 nanometers to detect the titanium content in a mass fraction range of between 0.020 and 6.50 percent; and drawing a second working curve by selecting an analysis line pair of 311.77/266.039 nanometers to detect the titanium content in a mass fraction range of between 0.200 and 12.86 percent so as to directly and accurately measure constant titanium in the aluminum-titanium-boron alloy by using the photoelectric direct reading emission spectrometer. Since sample decomposition is not needed, the method has the advantages of high analysis speed, simple operation and high suitability for process control detection and finished product detection of a production line.
Description
[technical field]
The present invention relates to the ultimate analysis method of testing of alloy material, especially a kind of method of measuring the Ti content in the Al-Ti-B alloy with the photo-electronic directly reading emission spectrometer.
[background technology]
Al-Ti-B alloy is the grain refiner that must add in a kind of aluminum profile extrusion process, the Al-Ti-B alloy of China's independent research has captured the home market comprehensively, and having opened the international market, China has become maximum in the world Al-Ti-B alloy producing country now.The key index of Al-Ti-B alloy depends on the content of alloying element such as titanium boron in the alloy, must carry out strict control in process of production, but because the time of Al-Ti-B alloy research and development is not long, the paces of production are not also caught up with in the research of corresponding analysis, and therefore researching and developing the analyzing detecting method that can satisfy the production control requirement becomes the task of top priority.
Standard GB/T 20975.25-2008 aluminium and aluminum alloy chemically analytical approach the 25th part: ICP-AES, stipulated the assay method of constituent contents such as iron, copper, titanium, silicon in aluminium and the aluminium alloy, wherein the measurement range of titanium elements is 0.0010%～5.00% (mass percent, the alleged constituent content number percent of the present invention is mass percent), this method requires to obtain solution according to the type of aluminium alloy and the content of element with acid or alkali decomposition samples, solution carries out spectroscopic assay with the plasma light source activation.Though this method accurately and reliably, but owing to before test, need a step of sample being carried out chemolysis, troublesome poeration and complexity, particularly the production run of Al-Ti-B alloy control requires that testing process is easy, data accurately and fast go out analysis result, and obviously this method is difficult to satisfy such requirement.Standard GB/T 7999-2007 aluminium and aluminium alloy photo-electronic directly reading emission spectrometry method, stipulated directly to measure the method for constituent content in the aluminum alloy materials with the photo-electronic directly reading emission spectrometer, comprise mensuration to constituent contents such as Si, Fe, Cu, Mg, Ni, Zn, Ti, V, Be, Ce, Ca, Na in the aluminium alloy, wherein the sensing range of titanium elements (Ti) content is limited to 0.00010～0.500%, for the titanium of constant, just can not adopt the method for this standard code to detect such as the titanium more than 1%.In other 2009 the 18th volume the 4th phase " chemical analysis and metering " the 28th～30 page of " the photoelectric direct reading spectrometry method is measured multielement in 7075 aluminium alloys " literary compositions, disclose the employing photo-electric direct reading spectrometer and measured Si in 7075 aluminum alloy materials simultaneously, Fe, Cu, Mg, Cr, Mn, Zn, Ti, the method of constituent contents such as Zr, this article has been studied each element optimal light spectral line and condition of work, but select in the analytical line that its analysis spectral line is just recommended from GB/T 7999-2007 aluminium and aluminium alloy photo-electronic directly reading emission spectrometry method, therefore the detection level of the titanium elements that it was suitable for≤0.2% also can't use the titanium that this method detects constant in the Al-Ti-B alloy.
[summary of the invention]
In order to address the above problem, the invention provides a kind of photo-electronic directly reading emission spectrometry that is suitable for directly measuring constant Ti content in the Al-Ti-B alloy.
First kind of technical scheme of the present invention is: a kind of method with Ti content in the photo-electronic directly reading emission spectrometer mensuration Al-Ti-B alloy, described titanium elements sensing range is 0.020%～6.50% (massfraction), comprises the following steps:
A, sampling: from sampling of the molten condition of Al-Ti-B alloy to be measured and cast molding is sample, perhaps directly intercepts sample on the ingot casting of Al-Ti-B alloy to be measured, foundry goods, converted products;
B, sample processing: materialsing analysis face is processed into bright and clean plane with lathe or milling machine;
C, test with the photo-electronic directly reading emission spectrometer: the shooting parameter of at first setting described photo-electronic directly reading emission spectrometer is in following scope: argon gas input pressure 0.35MPa～0.55MPa, flush time 3s～7s, preburn time 13s～17s, time shutter 6s～10s, set analytical line 395.821nm then, internal standard line 266.039nm also draws first working curve, before test sample, described first working curve is calibrated, begin to test the aforementioned sample that processes after the calibration, described photo-electronic directly reading emission spectrometer detects the spectral intensity of described analytical line and internal standard line and its ratio and described first working curve is compared and obtains the titanium elements content results.
The sensing range of more suitable titanium elements is 1.00%～6.50% (massfraction).
Further preferred scheme is: in the above-mentioned C step, setting the argon gas input pressure is 0.40MPa, flush time 5s, preburn time 15s, time shutter 7s.
Further preferred scheme is: the titanium elements mass percent of drawing in the above-mentioned C step in the selected aluminium alloy standard substance of described first working curve is respectively: 0.0141%, 0.197%, 5.29%, and the titanium elements mass percent in the Al-Ti-B alloy control sample is respectively: 4.80%, 6.50%.
For measuring the more titanium of high-load, second kind of technical scheme of the present invention is: a kind of method of measuring Ti content in the Al-Ti-B alloy with the photo-electronic directly reading emission spectrometer, the sensing range of described titanium elements is 0.200%～12.86% (massfraction), comprises the following steps:
A, sampling: from sampling of the molten condition of Al-Ti-B alloy to be measured and cast molding is sample, perhaps directly intercepts sample on the ingot casting of Al-Ti-B alloy to be measured, foundry goods, converted products;
B, sample processing: materialsing analysis face is processed into bright and clean plane with lathe or milling machine;
C, test with the photo-electronic directly reading emission spectrometer: the shooting parameter of at first setting described photo-electronic directly reading emission spectrometer is in following scope: argon gas input pressure 0.35MPa～0.55MPa, flush time 3s～7s, preburn time 13s～17s, time shutter 6s～10s, set analytical line 311.770nm then, internal standard line 266.039nm also draws second working curve, before test sample, described second working curve is calibrated, begin to test the aforementioned sample that processes after the calibration, described photo-electric direct reading spectrometer detects the spectral intensity of described analytical line and internal standard line and its ratio and described second working curve is compared and obtains the titanium elements content results.
The sensing range of the titanium elements that above-mentioned second kind of technical scheme is more suitable is 5.00%～10.00% (quality).
Above-mentioned second kind of further preferred version of technical scheme is: in the described C step, setting the argon gas input pressure is 0.40MPa, flush time 5s, preburn time 15s, time shutter 7s.
Above-mentioned second kind of technical scheme further preferred version is: the Ti content of drawing in the described C step in the selected aluminium alloy standard substance of described second working curve is respectively: the Ti content in 1.05%, 5.29% (quality) 0.107%,, and the Al-Ti-B alloy control sample is respectively: 12.86% (quality) 9.65%.
The present invention is by rationally setting the argon gas input pressure of photo-electronic directly reading emission spectrometer, flush time, preburn time and time shutter equal excitation parameter, and through long-term, a large amount of tests is selected from titanium elements number of characteristics spectral line and to be suitable for the photo-electronic directly reading emission spectrographic determination, with the corresponding desirable spectral line of sensing range as analytical line, it is unstable and owing to spectral line is dispersed with self-priming and caused the inaccurate problem of analysis result to have overcome in the mensuration of constant titanium other line strength well, from the characteristic spectral line of base aluminum, selected to have better spectral intensity simultaneously, disturb the few spectral line of spectral line as corresponding internal standard line, right with selected titanium elements analytical line composition analysis line, and this analytical line pair spectral intensity has the better linearity relation than the massfraction with titanium elements in sensing range, and then set up the working curve that can detect the constant titanium, thereby realized with the photo-electronic directly reading emission spectrometer directly to the accurate mensuration of constant titanium in the Al-Ti-B alloy, this method is not owing to need decompose sample, only need carry out simple sample processing can measure, therefore analysis speed is fast, simple to operate, be very suitable for the process control detection and the finished product detection of production line.
[description of drawings]
Fig. 1 is applicable to that the Ti content sensing range is 0.020%～6.50% first working curve, among the figure with the massfraction of titanium be horizontal ordinate, with analytical line pair (395.821/266.039nm) spectral intensity than being ordinate;
Fig. 2 is applicable to that the Ti content sensing range is 0.200%～12.86% second working curve, among the figure with the massfraction of titanium be horizontal ordinate, with analytical line pair (311.77/266.039nm) spectral intensity than being ordinate.
[embodiment]
Can further be well understood to the present invention by several specific embodiments of the present invention given below.But they are not limitation of the invention.
The Ti content of indication all refers to the content in titanium elements among the present invention.Except as otherwise noted, the content percentage that is adopted among the present invention is mass percent.
The employed key instrument of the embodiment of the invention: photo-electronic directly reading emission spectrometer FOUNDRY MASTER, German WAS company.
Instrument condition of work: working temperature: 18 ℃～26 ℃, working relative humidity: 30%～65% (relative humidity); No electromagnetic interference (EMI); Voltage: (220 ± 22) V, frequency: (50 ± 1) Hz.
Photo-electronic directly reading emission spectrometer shooting parameter compliance test result
1, argon gas input air pressure
Under the constant situation of other condition, only change the argon gas input air pressure, Ti10B0.1 excites to self-control Al-Ti-B alloy control sample, selects analytical line 311.770nm for use, internal standard line 266.039nm, measurement result 1 (n=6) that see the following form.
Table 1
| Argon gas input air pressure (MPa) | Titanium elements analytical line pair spectral line strength ratio average | ??RSD(％) |
| ?0.35 | ??128364 | ??2.2 |
| ?0.40 | ??129429 | ??1.7 |
| ?0.45 | ??131807 | ??3.5 |
| ?0.50 | ??130812 | ??2.5 |
| ?0.55 | ??129495 | ??2.6 |
In the table, titanium elements analytical line pair spectral line strength ratio is meant the ratio of titanium elements analytical line and aluminium base internal standard line line strength in the Al-Ti-B alloy, and RSD is meant relative standard deviation, equal implication for this reason among the present invention.
Test shows that the pressure control of argon gas sample excitation degree in 0.35MPa～0.55MPa scope is better, and excitation intensity was good when the pressure of argon gas was 0.40MPa, relative standard deviation is little.
2, flush time
Under the constant situation of other condition, only change flush time, homemade Al-Ti-B alloy control sample Ti5B0.2 is excited, select analytical line 395.821nm for use, internal standard line 266.039nm, measurement result 2 (n=6) that are listed in the table below.
The result shows that flush time is when 3s is above, and titanium elements analytical line pair spectral line strength ratio tends towards stability.
3, preburn time
Under the constant situation of other condition, only change preburn time, homemade Al-Ti-B alloy control sample Ti10B0.1 is excited, select analytical line 311.770nm for use, internal standard line 266.039nm, measurement result 3 (n=6) that are listed in the table below.
The result shows that preburn time line strength in the time of 13 seconds～17 seconds is stable, when preburn time is 15 seconds, and spectral line strength ratio relative standard deviation minimum.
Table 2
| Flush time (s) | Titanium elements analytical line pair spectral line strength ratio average | ??RSD(％) |
| ??3 | ??5637238 | ??0.7 |
| ??4 | ??5489873 | ??0.8 |
| ??5 | ??5698995 | ??1.2 |
| ??6 | ??5617369 | ??1.6 |
| ??7 | ??5561148 | ??1.7 |
Table 3
| Preburn time (s) | Titanium elements analytical line pair spectral line strength ratio average | ??RSD(％) |
| ??13 | ??132297 | ??2.1 |
| ??14 | ??129474 | ??2.0 |
| ??15 | ??129789 | ??1.4 |
| ??16 | ??131155 | ??2.9 |
| ??17 | ??132487 | ??2.5 |
4, the time shutter
Under the constant situation of other condition, only change the time shutter, homemade Al-Ti-B alloy control sample Ti5B0.2 is excited, select analytical line 395.821nm for use, internal standard line 266.039nm, measurement result 4 (n=6) that are listed in the table below.
Table 4
| Time shutter (s) | Titanium elements analytical line pair spectral line strength ratio average | ??RSD(％) | The shot point blushing |
| ??3 | ??5838760 | ??2.0 | Occur once in a while |
| ??4 | ??5763876 | ??1.0 | Occur once in a while |
| ??5 | ??5704090 | ??1.0 | Occur once in a while |
| ??6 | ??5672815 | ??1.1 | Do not have |
| ??7 | ??5564176 | ??1.2 | Do not have |
| ??8 | ??5745753 | ??1.1 | Do not have |
| ??9 | ??5475824 | ??1.9 | Do not have |
| ??10 | ??5464454 | ??2.2 | Do not have |
The result shows that time shutter line strength when 6s～10s is stable, and shot point does not have the phenomenon of turning white.
The drafting of working curve
The shooting parameter that the photo-electronic directly reading emission spectrometer is set is: ar pressure 0.4MPa, flush time 5s, preburn time 15s, time shutter 7s
1, first working curve: be applicable to that the Ti content sensing range is that the aluminium alloy standard substance selected for use of 0.0200%～6.50% working curve and the Ti content of self-control Al-Ti-B alloy control sample see the following form 5.
Table 5
| Sample number into spectrum | |
|
Standard specimen 3 | |
|
| Ti content (%) | ??0.0141 | ??0.197 | ??5.29 | ??4.80 | ??6.50 |
The setting analytical line is 395.821nm, internal standard line 266.039nm, and the drawing curve is seen Fig. 1, the massfraction with titanium elements among the figure is horizontal ordinate, be ordinate with analytical line pair (395.821/266.039nm) spectral intensity than (being relative spectral intensity).Drawing the working curve equation is: y=108510+135500x, and y is a relative spectral intensity in the formula, and x is the massfraction (%) of titanium elements, and related coefficient is R=0.9994.
2, second working curve: be applicable to that the Ti content sensing range is that the aluminium alloy standard substance selected for use of 0.200%～12.86% working curve and the Ti content of self-control Al-Ti-B alloy control sample see the following form 6.
Table 6
| Sample number into spectrum | |
|
Standard specimen 6 | Control sample 3 | |
| Ti content (%) | ??0.107 | ??1.05 | ??5.29 | ??9.65 | ??12.86 |
The setting analytical line is 311.770nm, internal standard line 266.039nm, and the drawing curve is seen Fig. 2, the massfraction with titanium elements among the figure is horizontal ordinate, be ordinate with analytical line pair (311.77/266.039nm) spectral intensity than (being relative spectral intensity).Drawing the working curve equation is: y=5200+9026x, and y is a relative spectral intensity in the formula, and x is the massfraction (%) of titanium elements, and related coefficient is R=0.9945.
Embodiment 3
The detection of Ti content in the production line Ti3B1 alloy
Take a sample from molten condition; pig mold or the bar-shaped sample of punching block cast molding (diameter is about 10mm) with preheating; about this bar-shaped sample 150mm of cooling back intercepting; cut each 10mm of two ends; analysis face is processed into bright and clean plane with lathe or milling machine; add and man-hour sample tiltedly be clipped on the anchor clamps, make that analyzing the face length degree is not less than 45mm, during sample turning with absolute ethyl alcohol cooling, lubricated.Open Atomic Emission Spectrometer AES, aluminium-titanium-boron alloy analytical parameters is set, with parameter setting be: argon gas input air pressure 0.45MPa, flush time 5s, preburn time 13s, time shutter 7s; The selection analytical line is 395.821nm, and internal standard line is 266.039nm.After treating instrument stabilizer, open vacuum pump,,, excite blank sample again to rinse out air wherein with argon cleaning whole loop 1min, treat at least 3 excitation values approximately equals after, select standard specimen that first working curve of drawing by embodiment 2 is carried out two point calibrations.After qualified, select the control sample close that this first working curve is carried out a point calibration, measure sample after finishing with the sample to be tested chemical constitution.Prefabricated sample to be tested is fixed on tackling excites on the platform, cover and excite the hole, keep contacting between spark platen and the sample to be tested excitating surface good, air tight, then sample is excited mensuration, excite at the face of analysis different parts at every turn, again process analysis face when needing, excite test 11 times, its result such as following table 7.
Table 7
The result shows that to measure relative standard deviation with this method little, satisfies 2% the requirement of being not more than of stipulating among the concerned countries standard GB/T 7999-2007, and revision test precision is good.
The mensuration of Ti content in the product Ti5B1 alloy
Get the Ti3B1 bulk sample of 50 * a 50 * 20mm, become bright and clean plane as analysis face with machined on 50 * 50mm plane of sample.Open emission spectrometer, with parameter setting be: argon gas input air pressure 0.40MPa, flush time 5s, preburn time 15s, time shutter 7s; Analytical line 395.821nm, internal standard line 266.039nm.After treating instrument stabilizer, first working curve is proofreaied and correct according to the method for embodiment 3, after finishing with sample with tackling be fixed on excite begin on the platform test, excite at the face of analysis different parts at every turn, again process analysis face when needing, sample excitation 11 times, its result such as following table 8.
Table 8
The result shows that to measure relative standard deviation with this method little, satisfies 2% the requirement of being not more than of stipulating among the concerned countries standard GB/T 7999-2007, and revision test precision is good.
The mensuration of Ti content in the product Ti5B0.2 alloy
Intercepting Ti5B0.2 diameter is about the bar-shaped sample 150mm of 10mm, cuts each 10mm of two ends, and analysis face becomes the worker to become bright and clean plane with machined into, adds man-hour sample tiltedly to be clipped on the anchor clamps, makes that analyzing the face length degree is not less than 45mm.Open emission spectrometer, with parameter setting be: argon gas input air pressure 0.50MPa, flush time 3s, preburn time 16s, time shutter 8s; Analytical line 311.770nm, internal standard line 266.039nm.After treating instrument stabilizer, open vacuum pump,,, excite blank sample again to rinse out air wherein with argon cleaning whole loop 1min, treat at least 3 excitation values approximately equals after, select standard specimen that second working curve of drawing by embodiment 2 is carried out two point calibrations.After qualified, select the control sample close that this second working curve is carried out a point calibration, measure sample after finishing with the sample to be tested chemical constitution.Sample is fixed on to excite with tackling begins test on the platform, excite analyzing the face different parts at every turn, process analysis face when needing again, sample excitation 11 times, its result such as following table 9.
Table 9
The result shows that to measure relative standard deviation with this method little, satisfies 2% the requirement of being not more than of stipulating among the concerned countries standard GB/T 7999-2007, and revision test precision is good.
Embodiment 6
The mensuration of Ti content in the product Ti10B0.1 alloy
Get the Ti10B0.1 bulk sample of 50 * a 50 * 20mm, become bright and clean plane as analysis face with machined on the plane of a 50 * 50mm of sample.Open emission spectrometer, with parameter setting be: argon gas input air pressure 0.40MPa, flush time 5s, preburn time 15s, time shutter 7s; Analytical line 311.770nm, internal standard line 266.039nm.After treating instrument stabilizer, second working curve is proofreaied and correct according to the method for embodiment 5, after finishing with sample with tackling be fixed on excite begin on the platform test, excite at the face of analysis different parts at every turn, again process analysis face when needing, sample excitation 11 times, its result such as following table 10.
Table 10
The result shows that to measure relative standard deviation with this method little, satisfies 1.5% the requirement of being not more than of stipulating among the concerned countries standard GB/T 7999-2007, and revision test precision is good.
Embodiment 7
Accuracy test
Get four batches in the Al-Ti-B alloy sample of different Ti contents, be numbered 1
#, 2
#, 3
#, 4
#, wherein 1
#, 2
#Sample adopts method and the standard GB/T 20975.12-2008 aluminium and aluminum alloy chemically analytical approach the 12nd part of the embodiment of the invention 4: the assay method two of Ti content: the test of comparing of hydrogen peroxide spectrophotometric method, 3
#, 4
#Sample adopts method and the standard GB/T 20975.12-2008 aluminium and aluminum alloy chemically analytical approach the 12nd part of the embodiment of the invention 6: the assay method two of Ti content: the test of comparing of hydrogen peroxide spectrophotometric method, analysis result sees the following form 11.
Table 11
By the comparison to the inventive method and GB/T20975.12-2008 methods analyst result, the result of table 11 shows the inventive method accuracy height, satisfies the corresponding requirements of chemical analysis national standard.
Claims (8)
1. measure the method for Ti content in the Al-Ti-B alloy with the photo-electronic directly reading emission spectrometer for one kind, the sensing range of described titanium elements is 0.020%～6.50% (massfraction), comprises the following steps:
A, sampling: from sampling of the molten condition of Al-Ti-B alloy to be measured and cast molding is sample, perhaps directly intercepts sample on the ingot casting of Al-Ti-B alloy to be measured, foundry goods, converted products;
B, sample processing: materialsing analysis face is processed into bright and clean plane with lathe or milling machine;
C, test with the photo-electronic directly reading emission spectrometer: the shooting parameter of at first setting described photo-electronic directly reading emission spectrometer is in following scope: argon gas input pressure 0.35MPa～0.55MPa, flush time 3s～7s, preburn time 13s～17s, time shutter 6s～10s, set analytical line 395.821nm then, internal standard line 266.039nm also draws first working curve, before test sample, described first working curve is calibrated, begin to test the aforementioned sample that processes after the calibration, described photo-electronic directly reading emission spectrometer detects the spectral intensity of described analytical line and internal standard line and its ratio and described first working curve is compared and obtains the titanium elements content results.
2. the method with Ti content in the photo-electronic directly reading emission spectrometer mensuration Al-Ti-B alloy according to claim 1, it is characterized in that: the sensing range of described titanium elements is 1.00%～6.50% (massfraction).
3. the method with Ti content in the photo-electronic directly reading emission spectrometer mensuration Al-Ti-B alloy according to claim 1, it is characterized in that: in the described C step, setting the argon gas input pressure is 0.40MPa, flush time 5s, preburn time 15s, time shutter 7s.
4. according to claim 1, the 2 or 3 described methods of measuring Ti content in the Al-Ti-B alloy with the photo-electronic directly reading emission spectrometer, it is characterized in that: the titanium elements mass percent of drawing in the described C step in the selected aluminium alloy standard substance of described first working curve is respectively: 0.0141%, 0.197%, 5.29%, and the titanium elements mass percent in the Al-Ti-B alloy control sample is respectively: 4.80%, 6.50%.
5. measure the method for Ti content in the Al-Ti-B alloy with the photo-electronic directly reading emission spectrometer for one kind, the sensing range of described titanium elements is 0.200%～12.86% (massfraction), comprises the following steps:
A, sampling: from sampling of the molten condition of Al-Ti-B alloy to be measured and cast molding is sample, perhaps directly intercepts sample on the ingot casting of Al-Ti-B alloy to be measured, foundry goods, converted products;
B, sample processing: materialsing analysis face is processed into bright and clean plane with lathe or milling machine;
C, test with the photo-electronic directly reading emission spectrometer: the shooting parameter of at first setting described photo-electronic directly reading emission spectrometer is in following scope: argon gas input pressure 0.35MPa～0.55MPa, flush time 3s～7s, preburn time 13s～17s, time shutter 6s～10s, set analytical line 311.770nm then, internal standard line 266.039nm also draws second working curve, before test sample, described second working curve is calibrated, begin to test the aforementioned sample that processes after the calibration, described photo-electronic directly reading emission spectrometer detects the spectral intensity of described analytical line and internal standard line and its ratio and described second working curve is compared and obtains the titanium elements content results.
6. the method with Ti content in the photo-electronic directly reading emission spectrometer mensuration Al-Ti-B alloy according to claim 5, it is characterized in that: the sensing range of described titanium elements is 5.00%～10.00% (massfraction).
7. the method with Ti content in the photo-electronic directly reading emission spectrometer mensuration Al-Ti-B alloy according to claim 5, it is characterized in that: in the described C step, setting the argon gas input pressure is 0.40MPa, flush time 5s, preburn time 15s, time shutter 7s.
8. according to claim 5, the 6 or 7 described methods of measuring Ti content in the Al-Ti-B alloy with the photo-electronic directly reading emission spectrometer, it is characterized in that: the titanium elements mass percent of drawing in the described C step in the selected aluminium alloy standard substance of described second working curve is respectively: 0.107%, 1.05%, 5.29%, and the titanium elements mass percent in the Al-Ti-B alloy control sample is respectively: 9.65%, 12.86%.
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| CN1360084A (en) * | 2001-12-31 | 2002-07-24 | 清华大学 | Coating for selective absorption of sunlight spectrum |
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