Technical description:
Temperature measurement is the eyes of the industrial production and scientific research. However, this high temperature measurement, particularly  the automatic control  of high temperature, still is the  expensive platinum-rhodium thermocouple .Conventional tungsten rhenium thermocouple is capable of measuring high temperatures,but  that can not be used in an oxidizing atmosphere. This patent takes use of the double protection tube  and the perfect combination of special packing structure and the outer and inner layers of .It can prevent oxidation of the high-temperature process of using osmotic mini,at the same time  eliminate residual oxygen packing microporous and silk gap.So that can ensure the long-term use of tungsten-rhenium thermocouples in the oxidation of the atmosphere . While using the structure and techniques of this patent, we useboth inside and outside protective tube of different materials  and  different fillers.In this way it can widen the range of applications of the tungsten-rhenium thermocouple extending from the ultra-high temperature to the high temperature,from the general medium  to the special medium.  This method not only can partially replace the platinum rhodium thermocouple, but also  can  be applied to special areas which some of the platinum-rhodium thermocouple are unbearable.

Prospects for applications of the technology:
The patented technology  is the  main part of  measuring high temperature. In the high temperature zone  it can replace the expensive platinum-rhodium thermocouple. In ultra-high temperature zone it  is NO.1. Its products can be widely used in metallurgy, machinery, chemical industry, light industry, electric power, petroleum, aerospace, and cement ceramic silicate industrial sector, the market prospect is  so broad.

The analysis of economic benefit :
This patented technology uses raw materials and equipment  in the existing markets, require minimal equipment and don not have waste emissions. This patent is especially suitable for the existing thermal instrumentation manufacturers. Initial investment  can be only a few million. If  it is estimatedf  from  the market share  of a few percent , there are several million dollars of annual profit margins.


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The invention discloses a  kind of  beneficiation process molybdenum-tungsten oxide. This process as follows: the degree of ore crushing monomer solution dissociation is  ≥ 70%; preferential flotation molybdenum disulfide; sorting after flotation tailings grading sediment, sediment systemalkali to adjust the agent, sodium silicate inhibitor, emulsified fatty acids collector, the mixed sediment sorting rough concentrate Featured, molybdenum and tungsten oxide ore mixed concentrate. The mixed concentrate regrinding join inhibitor, selected secondary concentrates; the secondary concentrates Petrov method selected, scheelite and molybdenum oxide, tungsten ore dressing concentrate.

This  invention has the following advantages: 1. The  invention discloses a process of molybdenum and tungsten oxide ore beneficiation process;

2. The invention solves the problem of low technology indicators of  molybdenum tungsten oxide;

3. The invention is to complete the study of laboratory tests, and complete the implementation of the industrialization at  first time in domestic.


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The shape of the general chemical synthesis calcium tungsten is amorphous powder. Because powdery is sticky, controlled feeding can not be accurately measured, and therefore it is more difficult in the application. Measurement of granular calcium tungsten  is accurate,  and feeding applications are so extensive . The present invention is a new technology  by using chemical methods to manufacture calcium tungsten. Chemical synthesis, could be produced mainly through the control of the mother liquor PH  to complete 5-7 microns of chemical calcium tungsten particles and calcium tungsten  can be widely applied to the process of feeding of calcium tungsten. This product  was welcomed by foreign businessmen in the 1979 Fair trading.


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The invention relates to a tungsten alloy and tantalum alloys cryogenic diffusion welding method, the steps of this method include: (1) the cleaning steps of workpiece surface: tungsten alloy, tantalum alloy processed to a predetermined size, and to be welded to remove them and the intermediate layer - nickel foil surface oxide layer;

(2)the steps of workpiece assembly : the middle layer - nickel foil placed between the tungsten alloy and tantalum alloy structure is welded to the workpiece;

(3)the steps of vacuum diffusion welding: put welded workpiece into the vacuum diffusion welding furnace, heating, insulation. At the beginning of the insulation axial pressure is applied to the workpiece. At the end of insulation, we should remove pressure and cool in the furnace.

The problem of the present invention is able to overcome that the existing welding techniques can not be achieved at a low temperature of tungsten alloys and tantalum alloys high quality diffusion welding. This invention is particularly suitable for reliable and precision at low temperatures of the diffusion welding between the tungsten alloys and tantalum alloys. The tungsten tantalum welded body can be used to in the fields of high-pressure physics and nuclear fusion research.


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