DE202011052304U1 - Device for scouring material samples - Google Patents

Abstract

Device for flaming material samples by means of high-intensity high-temperature heating, including a gas burner (1) with an extension piece, the extension piece being provided with numerous evenly arranged nozzles, characterized in that the device is equipped with a separating screen (2) made of a heavy material, wherein the length and the width of the separating screen (2) exceed the corresponding dimensions of the sample (3) of the material to be treated by 10-15 mm and the separating screen (2) is designed so that it is between the extension piece and the sample (3) of the material to be processed can be arranged, and that the nozzles of the extension piece are conical, have a diameter of the outlet opening of 0.8-1.2 mm and an opening angle of 10-20 °, are 1-2 mm high and in one A distance of 3–4 mm to each other are arranged.

Description

The invention relates to a device for scarfing material samples according to the preamble of the claim.

The invention can be used for devices for scarfing material samples by means of high-intensity high-temperature heating. The invention can be used to perform strength and durability tests at elevated (above 1000 ° C) temperatures and when the specimens are heated at a rate of 30-50 degrees / sec. be applied, d. H. in such work processes of the materials, which are close to their work under real conditions.

) ermöglichen eine Steigerung der Aufheizrate bis zu 20–30 Grad/Sek. Die höchste Erhitzungstemperatur ist jedoch 1.000°C. Die Temperatur der Proben kann erhöht werden, wenn die elektrische Speisespannung der Lampen erhöht wird. Dadurch wird aber ihre Lebensdauer vermindert. Bei einer Erhitzung der Probestücke bis zu Temperaturen von 1.300–1.400°C muss die Speisespannung ca. 300 V betragen. In diesem Fall verringert sich die Lebensdauer der Halogenlampen auf nur 100–150 Sek. Bei einer weiteren Erhöhung der Speisespannung der Halogenlampen bis z. B. 330–350 V werden diese Lampen praktisch sofort zerstört.The equipment currently used and used in the test rigs to heat materials is mostly electrical. These are often either muffle ovens or equipment with halogen lamps. The muffle furnaces are used for testing the fatigue strength of material samples. In this case, no high heating rate is required. The holding time under high temperatures is several hours. Halogen lamps (in test equipment of type MTS (MTC) or ZVIG

) allow an increase in the heating rate up to 20-30 degrees / sec. However, the highest heating temperature is 1,000 ° C. The temperature of the samples may be increased as the electrical supply voltage of the lamps is increased. As a result, but their life is reduced. When the specimens are heated up to temperatures of 1,300-1,400 ° C, the supply voltage must be approx. 300V. In this case, the life of the halogen lamps is reduced to only 100-150 sec. In a further increase in the supply voltage of the halogen lamps to z. B. 330-350 V, these lamps are destroyed almost immediately.

) vorgenommen werden. Um diese zu starten und zu betreiben, ist eine spezielle Ausrüstung erforderlich. Ihre sichere und lange Funktion setzt die Anwendung einer Außenkühlung mit Hilfe von destilliertem Wasser voraus.The heating of the samples to be tested down to temperatures of 1,400-1,500 ° C can be carried out by means of gas discharge lamps (type DKSTV

). To start and operate these special equipment is required. Their safe and long function requires the application of external cooling with the help of distilled water.

wird Folgendes festgestellt: Die Materialprobe wird im Abstand von 10 mm zur Lampe angeordnet. Bei einer Speisespannung von 300 V zur Erhitzung der Materialprobe bis auf eine Temperatur von 1.800°C vermindert sich die Lebensdauer der Lampen und beträgt nur 300–400 Sek. Wird die Speisespannung bis 330 V erhöht, so wird die Materialprobe zwar bis 1.800°C erwärmt, die Lebensdauer der Lampe beträgt dabei aber nur noch 150–200 Sek.Today, the need for material testing at temperatures of 1,800-1,900 ° C is becoming more current. When using a lamp DKSTV

the following is determined: The material sample is placed at a distance of 10 mm from the lamp. With a supply voltage of 300 V for heating the material sample up to a temperature of 1,800 ° C, the life of the lamps is reduced and is only 300-400 sec. If the supply voltage is increased up to 330 V, the material sample is heated to 1,800 ° C However, the lamp life is only 150-200 sec.

The heating of the material samples to be tested to temperatures of 1,800-1,900 ° C by means of gas discharge lamps is possible, but only for a very short time with difficult predictable lifetime of the used gas discharge lamps.

From publication RU 2215623 (C1, B23K 5/00, 7/06, 10.11.2003) is a device for scarfing materials is known, which has a burner with an extension. The attachment is provided with numerous nozzles. This device is considered to be the closest state of the art. This device allows high-intensity high-temperature heating of the materials to be carried out over a long period of time.

However, this known device provides a strength and durability test of the materials with heating of the specimens up to temperatures of 1,800-2,000 ° C under a high heating rate up to 80 degrees / sec. for a long time (this is limited by the characteristics of the gas flow and a container with gas components) no uniform heating of the sample sure. This causes premature cracking in the samples and thus does not reflect any actual functional conditions of the materials.

It is an object of the invention to ensure a uniform heating and to avoid an impact of the combustion products of the fuel used for the gas burner on the sample.

The stated object is solved by the features of the claim.

The means for scavenging material samples by heating comprises a gas burner with a nosepiece. The attachment is provided with numerous nozzles. This device is equipped according to the invention with a separation screen (partition plate) made of a heavy liquid material. The length and the width of the separating screen exceed the dimensions of the sample to be processed by 10-15 mm.

The separation screen is configured to be disposed between the gas burner and the sample. The nozzles of the extension piece are conical, with the diameter of the outlet opening 0.8-1.2 mm, the height 1-2 mm and the opening angle 10-20 °. The nozzles are arranged at a distance of 3-4 mm from each other.

The invention will be explained in more detail with reference to an embodiment shown in the drawings. Show it:

1 a device for scarfing on average and

2 the device in operating condition.

The device has a gas burner 1 with an extension on. In the attachment 4 There are many nozzles installed. The gas burner 1 Is operated with gas components. As Oxydans is gaseous oxygen and used as fuel propane, methane or ethane. The nozzles in the attachment of the burner 1 have a diameter of 0.8-1.2 mm and are arranged at a distance of 3-4 mm from each other to ensure an overlap of the flames of the burning gas of all nozzles. This is necessary to achieve a uniform heating of the material sample. Each nozzle is formed at its exit as a 1-2 mm high cone with an opening angle of 10-20 °. Depending on the task of the test is between the burner 1 and the sample 3 a separating screen 2 in the form of a plate 2 ( 2 ) arranged. This is necessary to prevent mass leakage from the material sample to be tested and uniform heating of the sample 3 to improve. The separating screen 2 is made of a heavy liquid material (niobium, molybdenum, tungsten or ceramic). The heat from the plate is sent to the sample 3 transfer. This is done either thanks to the thermal conductivity of the sample material when the sample 3 is located close to the plate, or thanks to the radiant heat flux when the sample 3 protrudes from the heated plate. During a high intensity heating of the sample 3 are the burner 1 and the plate at such a distance from the sample 3 arranged that the hot gases of the burner 1 the sample 3 do not hit and do not touch. Once the plate is heated to the required predetermined temperature, the plate is joined to the burner 1 shifted into a dwell of the material sample to be tested. Thereafter, an intense heating of the sample begins 3 , The constant temperature of the sample 3 is maintained by keeping a distance from the sample 3 to the burner 1 or up to that through the burner 1 heatable plate is selected. This distance is chosen in advance during tests on model samples.

The device allows material samples up to temperatures of 1,800-2,000 ° C with a high heating rate up to 80 degrees / sec. and to warm for a long time. This is limited by such characteristics as gas flow and capacity of a container with gas components.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• RU 2215623 [0007]

Claims (1)

Device for scavenging material samples by means of high-intensity high-temperature heating, including a gas burner ( 1 ) with an attachment piece, the attachment piece being provided with numerous uniformly arranged nozzles, characterized in that the device is provided with a separation screen ( 2 ) is made of a heavy liquid material, the length and the width of the separating screen ( 2 ) the corresponding dimensions of the sample ( 3 ) of the material to be treated exceed 10-15 mm and wherein the separation screen ( 2 ) is designed so that it is between the end piece and the sample ( 3 ) of the material to be processed can be arranged, and that the nozzles of the end piece are conical, have a diameter of the outlet opening of 0.8-1.2 mm and an opening angle of 10-20 °, 1-2 mm high and in a distance of 3-4 mm from each other are arranged.

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