Single crystal copper fixed anode target for X-ray tube and preparing method thereof

A technology for fixing anodes and single crystal copper, applied in X-ray tube electrodes, X-ray tube components, etc., can solve problems such as cracking, affecting vacuum degree, shortening life, etc., achieve long service life, improve power and life , the effect of reducing the casting temperature

Inactive Publication Date: 2019-10-08
株洲未铼新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is easy to cause cracking along the grain boundary, thereby affecting the vacuum degree and shortening the life

Method used

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  • Single crystal copper fixed anode target for X-ray tube and preparing method thereof
  • Single crystal copper fixed anode target for X-ray tube and preparing method thereof

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preparation example Construction

[0027] The preparation method of the copper single crystal fixed anode target for the X-ray tube, the specific steps include:

[0028] Step 1, the preparation of the mold, prepare a graphite mold suitable for the size of the fixed anode target, drill holes on the side of the mold, and keep the angle of the hole consistent with the slope of the mold.

[0029] Step 2, the pre-reduction process, put the tungsten-rhenium alloy rolled sheet and high-purity copper powder in the mold, and heat and reduce in a heating furnace with hydrogen. The temperature is controlled at 900-1000°C, and the hydrogen flow is controlled to clean and restore impurities on the surface of the mold and raw materials. During this step, crystal nuclei start to form above the mold holes. At the same time, the tungsten-rhenium alloy flakes and the copper powder form a certain combination, which accelerates the growth rate of the copper single crystal in the third step.

[0030] Step 3: Casting, raise the te...

Embodiment 1

[0033] Such as figure 1 A graphite mold structure for fixing an anode target with single crystal copper for an X-ray tube shown includes a graphite base 1 and a graphite peripheral wall 1a, which are integrally combined with the graphite base 1 . The side inner holes 2 are parallel to the upper surface 1 of the graphite base, which can promote the formation of crystal nuclei. Tungsten-rhenium alloy sheet 3, high-purity copper powder 4.

Embodiment 2

[0035] Put into the processed tungsten-rhenium alloy sheet 3 and high-purity copper powder 4 according to the proportion in the graphite mold in embodiment 1, then place in the heating furnace, according to figure 2 The process of temperature curve is heated.

[0036] In stage A, hydrogen gas is introduced and the temperature is kept at 800-900° C. During this process, impurities on the surface of the graphite boat 1 in the furnace are reduced and cleaned. The time of heating and passing hydrogen should be long enough to remove impurities on the surface of the boat and raw materials in the furnace. Through this step, the formation of crystal nuclei in parts other than the parts above the inner holes on the sides of the graphite mold can be suppressed, and the speed of nucleation in the cooling step will be accelerated. At the same time, at this stage, a bonding layer is formed between the tungsten-rhenium alloy sheet and the copper powder, which will accelerate the rate of f...

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Abstract

The invention provides a single crystal copper fixed anode target for an X-ray tube. The single crystal copper fixed anode target comprises a copper base and a tungsten-rhenium alloy sheet target surface. A preparing method for preparing the single crystal copper fixed anode target for the X-ray tube comprises the steps that a tungsten-rhenium alloy sheet and a high-purity copper powder are addedinto a mold, and slow cooling is carried out after two-stage temperature rising and heating are carried out. Through design of the mold and the process temperature, the prepared fixed anode target base copper is of a single crystal structure. Because no thermal expansion coefficient and thermal conductivity anisotropy caused by grain boundaries exists, the problem of grain boundary cracking causedby the thermal stress effect in work of the X-ray fixed anode target is solved, the heat dissipation performance is higher, and the service life is longer.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to a single crystal copper fixed anode target material for an X-ray tube and a preparation method thereof. Background technique [0002] When the X-ray tube is working, a high voltage is applied to the cathode to generate an electron beam, which bombards the anode target at high speed, so that the anode target generates X-rays. When the electron beam bombards, only 1% of the energy is converted into X-ray energy, and the rest of the energy is all converted into heat energy, so the temperature of the target body will rise sharply to above 1000°C. In order to obtain stronger X-ray output power, it is usually adopted by increasing the electron beam current rating. While requiring more concentration in the focal area, it will also lead to overheating or even partial melting of the target surface. [0003] The X-ray tube fixed anode target is usually composed of an oxygen-free...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16C22C27/04H01J35/08
CPCB22D19/16C22C27/04H01J35/08
Inventor 张明鸣邹远振周文强
Owner 株洲未铼新材料科技有限公司
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