KR20170033108A - Manufacturing method for hydrogen storage molded body - Google Patents

Abstract

The present invention relates to a manufacturing method for a hydrogen storage molded body. According to an embodiment of the present invention, a manufacturing method for a hydrogen storage molded body comprises the following steps of: (S100) manufacturing a mixture (110) by mixing titanium (Ti) powder (120), titanium hydrogen compound (TiHx) powder (130), a reducing agent (140), and a binder (150); (S200) generating base material powder (210) by granulating the mixture (110); (S300) forming a molded body (310) by injection molding the base material powder (210); and (S400) defatting the molded body (310).

Description

TECHNICAL FIELD [0001] The present invention relates to a method for producing a hydrogen storage molded article,

The present invention relates to a process for producing a hydrogen storage compact.

Each year, a fire causes many casualties and property damage. The average number of fires over the past decade has exceeded 400,000 statistically. The average casualty is about 2,000 people. Also, as of 2014, property damage exceeded 4 trillion won. These fires occur frequently in buildings where people live or work, but since the time of occurrence is mainly nighttime, it is difficult for people to find a fire easily and cope with it.

In order to solve such a problem, a fire detector has been devised as disclosed in the patent documents of the following prior art documents. Here, a fire detector refers to a component that directly detects a fire in an automatic fire detection system or an automatic fire extinguishing system. When a fire occurs in a room, such a fire detector detects smoke or heat, detects the occurrence of a fire, sounds an alarm or emits water. Smoke detectors used in fire detectors are ionization type that uses the change of ion current and photoelectric type that uses the change of light amount. It has a higher fire response than the heat detector, but is relatively expensive. On the other hand, a heat sensor includes a bimetal-based calorimetric thermal sensor and a differential-type sensor that uses internal air expansion. However, the thermal sensor has a problem that the reaction time is slow and the bimetal malfunctions due to moisture or dust.

In order to overcome the problems of smoke detectors and heat detectors, fire detectors using metal hydrides have been developed. Metal hydrides are formed by the absorption of hydrogen by a metal, and they have the property of releasing hydrogen when heated. These metal hydrides constitute a fire detector, which detects a change in gas pressure and detects a fire when a fire occurs. A fire detector using such a metal hydride can detect a fire in a wide area and has excellent reliability, so that it has a higher utilization rate than a conventional fire detector, but has a problem that the manufacturing cost is excessively high and the manufacturing process is complicated.

KR 10-2013-0025173 A

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and one aspect of the present invention is to provide a method of manufacturing a composite material by mixing titanium hydride (TiHx) powder in a mixing process of titanium (Ti) powder, a reducing agent, The present invention is intended to provide a method of manufacturing a hydrogen storage compact capable of effectively suppressing formation of titanium oxide and capable of hydrogen injection into a compact even at a low temperature.

Another aspect of the present invention is to provide a method for producing a hydrogen storage molded article, which is simple in the manufacturing process, by granulating the mixture into powder form and injection molding.

(A) mixing a titanium (Ti) powder, a titanium hydrogen compound (TiHx) powder, a reducing agent, and a binder to prepare a mixture, (B) ) Granulating the mixture to produce a raw material powder, (C) injection molding the raw material powder to form a formed body, and (D) degreasing the formed body.

Further, in the method for producing a hydrogen storage molded body according to an embodiment of the present invention, the molar ratio (x) of hydrogen (H0) to titanium (Ti) in the titanium hydrogen compound is 1.7-2.

Further, in the method for producing a hydrogen storage molded article according to an embodiment of the present invention, the reducing agent is at least one of magnesium (Mg) and aluminum (Al).

Further, in the method for manufacturing a hydrogen storage molded article according to an embodiment of the present invention, the binder is at least one of naphthalene and paraffin wax.

Further, in the method for manufacturing a hydrogen storage molded article according to an embodiment of the present invention, the step (C) comprises injection molding the molded body in the form of a wire.

Further, in the method for manufacturing a hydrogen storage molded article according to an embodiment of the present invention, the step (C) includes a step of extruding the molded article injection-molded into a predetermined shape into a wire shape.

Further, in the method of manufacturing a hydrogen storage molded article according to an embodiment of the present invention, the step of sintering the degreased molded body further includes the step of sintering the degreased molded body.

In addition, in the method for manufacturing a hydrogen storage molded article according to an embodiment of the present invention, it further includes injecting hydrogen into the degreased molded body.

Further, in the method of manufacturing a hydrogen storage molded body according to an embodiment of the present invention, the hydrogen-injected molded body releases the hydrogen by heat when a fire occurs, thereby changing the pressure of the gas to detect a fire.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, titanium hydride (TiHx) powder as well as a reducing agent as well as a titanium hydrogen compound effectively inhibit the formation of titanium oxide by mixing titanium hydride (TiHx) powder during mixing of titanium (Ti) powder, a reducing agent and a binder. Therefore, there is an advantage that hydrogen can be injected into a molded body even at a low temperature.

Further, according to the present invention, the bulk material is not produced in the form of a wire but the mixture is granulated in the form of powder and injection-molded in the form of a wire, so that the manufacturing process is simplified.

1 is a flowchart of a method of manufacturing a hydrogen storage molded article according to an embodiment of the present invention.
Fig. 2 is a configuration diagram showing the configuration of Fig. 1. Fig.
Figs. 3 to 4 are flowcharts of the steps of forming the molded body shown in Fig.
5 is a cross-sectional view illustrating a part of a fire sensor to which the hydrogen storage molded body manufactured by the method of manufacturing the hydrogen storage molded body according to the embodiment of the present invention is applied.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. Also, the terms "first "," second ", and the like are used to distinguish one element from another element, and the element is not limited thereto. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flowchart of a method for manufacturing a hydrogen storage molded article according to an embodiment of the present invention, and FIG. 2 is a configuration diagram showing the configuration of FIG.

1 and 2, a method of manufacturing a hydrogen storage molded body according to an embodiment of the present invention includes a method of manufacturing a TiO 2 powder 120, a TiHx powder 130, a reducing agent 140, A step S100 of mixing the binder 110 and the binder 110 to form a mixture 110 and a step S200 of forming the mixture 110 to form a raw powder 210, (S300) of forming a formed body (310) by molding, and degreasing the formed body (310) (S400).

The method for producing a hydrogen storage compact according to the present embodiment includes the steps of producing a mixture 110, producing a raw material powder 210, forming a formed body 310, (S300), and degreasing the formed body 310 (S400).

Here, the hydrogen storage compact is a metal hydride produced by absorbing hydrogen from a metal, and means a formed body 310 having a predetermined shape through injection molding. Such a hydrogen storage compact emits hydrogen when heated, and absorbs hydrogen again when cooled.

The hydrogen storage compact is produced by mixing metal powder. In the step (S100) of producing the mixture 110, the titanium (Ti) powder 120, the titanium hydrogen compound (TiHx) powder 130, the reducing agent 140, Binder 150 is mixed. Here, titanium is one of the metals that absorbs and binds hydrogen well, and is not only excellent in hydrogen storage capacity but also very stable, so that the risk of explosion is low. These titanium are mixed in powder form. This is because an oxide film is formed on titanium to inhibit hydrogen injection, which will be described later. Specifically, in the case of using bulk titanium, the surface area of titanium exposed to hydrogen is reduced due to the oxide film, so that the hydrogen adsorption rate is delayed. As a result, the hydrogen injection process must be performed at a high temperature of 600 ° C or higher have. On the other hand, in the method of manufacturing the hydrogen storage molded body according to the present embodiment, since titanium is used in powder form, the surface-to-volume ratio is greatly improved, and the amount of titanium exposed to the hydrogen gas is increased, have.

Further, the titanium powder 120 maximizes the effect of the reducing agent 140. Here, the reducing agent 140 may be at least one of magnesium (Mg) and aluminum (Al), for example, a material for reducing titanium dioxide (TiO ₂ ) having an oxide coating formed thereon. However, the reducing agent 140 is not necessarily limited to magnesium or aluminum, and includes all known materials capable of reducing the titanium oxide to reduce the oxide film.

On the other hand, the titanium hydrogen compound powder 130 mixed in the compound improves the quality of the formed body 310. Specifically, the titanium hydrogen compound reduces impurities such as oxygen, thereby suppressing the formation of an oxide film on the surface of titanium and having an excellent surface quality. The molar ratio (x) of hydrogen (H) to titanium (Ti) in this titanium hydrogen compound may be 1.7 to 2. However, the molar ratio is not necessarily limited thereto. On the other hand, titanium hydrogen compounds are also mixed in powder form, wherein the average particle size can be 8.40 to 8.80 탆. However, the average particle size is not necessarily limited thereto.

The binder 150 is for binding powder particles, and at least one of naphthalene and paraffin wax may be used. However, the material is not limited thereto, and known materials such as polyethylene, polypropylene and the like may be used.

The mixture 110 is prepared by mixing the titanium powder 120, the titanium hydrogen compound powder 130, the reducing agent 140, and the binder 150.

After the mixture 110 is produced, a step S200 of producing a raw powder 210 is performed. Here, the mixture 110 is granulated to produce a raw material powder 210. That is, the mixture 110 is granulated in the form of granules to become the raw material powder 210. The mixture 110 is in the form of a lump since the titanium powder 120, the titanium hydrogen compound powder 130 and the reducing agent 140 are combined by the binder 150, but they are weak in strength and easily crushed even with small external force.

When the raw material powder 210 is formed, the raw material powder 210 is injection-molded to form the formed body 310. Specifically, in step S300 of forming the formed body 310, the raw powder 210 is injected into a metal mold and molded into a predetermined shape using an injection molding apparatus. At this time, the injection molding apparatus may be a known powder injection molding apparatus including a hopper, an injection cylinder, a screw, and a mold. That is, the step S300 of forming the formed body 310 is performed by powder injection molding. Therefore, the method of manufacturing the hydrogen storage compact according to the present embodiment can form a uniform microstructure without forming a density gradient in the compact 310, and the manufacturing process is simple and economical.

After the formed body 310 is formed, the step of degreasing the formed body 310 is performed (S400). Degreasing means a step of removing the binder 150 in the formed body 310. When the binder 150 is present in the formed body 310, the mechanical strength is lowered, and hydrogen is inflowed when hydrogen is injected, so that the binder 150 is removed. The degreasing process includes a sublimation process, that is, a process of heating the compact 310 to a predetermined temperature. On the other hand, the titanium hydrogen compound should not be included in the final formed body 310 manufactured by the method of manufacturing the hydrogen storage compact according to the present embodiment. Accordingly, the sublimation temperature in the degreasing process is a temperature suitable for degreasing, at which the titanium hydrogen compound is dehydrogenated and reduced to metallic titanium.

The hydrogen storage compact according to the embodiment of the present invention can be manufactured by mixing the titanium hydrogen compound powder 130 in the mixing process of the titanium powder 120, the reducing agent 140 and the binder 150, 140, as well as the titanium hydrogen compound powder 130 effectively inhibits the formation of titanium oxide, enabling hydrogen injection into the degreased molded body 310 even at a low temperature.

Further, since the powder 110 is subjected to a powder injection molding process after being granulated in the form of powder instead of using a bulk material, the production process is simple.

Figs. 3 to 4 are flowcharts of the steps of forming the molded body shown in Fig.

The injection-molded body 310 may finally have a wire form. Specifically, as shown in FIG. 3, in the step S300 of forming the formed body 310, injection molding can be effected directly in the form of a wire by an injection molding apparatus. That is, the raw powder 210 is injected into a wire-shaped metal mold to form a wire-shaped formed body 310.

On the other hand, as shown in FIG. 4, the step of forming the molded body 3100 (S3000) may include a step of extrusion molding. Specifically, raw material powder 2100 is injection-molded to form bar-shaped formed body 3100a, and bar-shaped formed body 3100a is supplied to an extrusion molding machine to push molded body 3100 in a wire form. Here, the rod shape and the wire shape are distinguished according to the size of the cross-sectional area, and the wire shape means a shape having a smaller cross-sectional area than the rod shape. An extruder is generally a type of pressurizing machine that puts a material into a cylinder and extrudes it with a plunger or a screw, and includes all known molding machines. The extrusion process includes hot extrusion at high temperature and cold extrusion at room temperature. At this time, any one of the processes can be selected, but cold extrusion is more preferable in consideration of prevention of oxidation, increase in production rate, and excellent surface finishing treatment.

Meanwhile, the method of manufacturing the hydrogen storage compact according to the present embodiment may further include a step of sintering the compact 310. The sintering process is a process for improving the mechanical properties by densifying the powder remaining after degreasing, and there are general sintering, pressure sintering, hot isostatic pressing, and the like. The sintering process according to the present embodiment proceeds in consideration of the mechanical strength of the degreased formed body 310. That is, since there is a need to form the porous formed body 310 to prevent hydrogen brittleness, which is caused by the hydrogen absorbed into the metal, the sintering process is minimized in order to improve the mechanical strength. At this time, the desired porosity can be obtained by controlling the sintering temperature and the holding time.

As described above, in order to form the wire-shaped formed body 310, the extrusion method for applying the compressive force is employed instead of the wire drawing method in which a tensile force is applied .

In addition, the method for manufacturing the hydrogen storage molded body according to the present embodiment may further include injecting hydrogen. Hydrogen is injected into the degreased wire-shaped formed body 310 in the step of injecting hydrogen. As described above, by using the titanium powder 120, the reducing agent 140, and the titanium hydrogen compound to prepare the mixture 110, the surface area of titanium exposed to the hydrogen gas is increased, and the formation of the oxygen film Hydrogen injection can be performed even at a low temperature.

On the other hand, the molded body 310 into which the hydrogen is injected can be used for various devices and the like, but can be particularly usefully applied to a fire detector.

Hereinafter, the case where the molded body 310 into which hydrogen is injected is used for a fire detector will be described in detail.

5 is a cross-sectional view illustrating a part of a fire sensor to which the hydrogen storage molded body manufactured by the method of manufacturing the hydrogen storage molded body according to the embodiment of the present invention is applied.

As shown in FIG. 5, the hydrogen storage compact 310 can be applied to a fire detector. Here, the formed body 310 into which the hydrogen is injected is defined as the hydrogen storage body 310. The hydrogen storage molded body 310 discharges the hydrogen 1 when it is heated because the titanium is combined with the hydrogen 1 and absorbs the hydrogen 1 again when it is cooled. Specifically, the hydrogen storage molded body 310 is inserted into the tube 330 having a predetermined length in such a fire detector. Therefore, when a fire occurs, the hydrogen storage molded body 310 generates hydrogen 1 by heat, and the hydrogen 1 thus generated increases the pressure of the gas in the tube 330. At this time, the pressure change of the gas is detected by the pressure switch 340 of the fire detector, and as a result, the occurrence of the fire is detected. Meanwhile, an inert gas such as helium gas may be injected into the tube 330 in which the hydrogen storage compact 310 is disposed. At this time, even if a small amount of hydrogen (1) is generated at a low temperature, the pressure of the gas changes. Since such a fire detector can be formed in the shape of a long tube 330, a fire detection area is wide, and a fire due to a temperature rise in a predetermined space as well as a local flame can be simultaneously detected.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: hydrogen 110: mixture
120: Titanium powder 130: Titanium hydrogen compound powder
140: Reducing agent 150: Binder
210, 2100: raw material powder 310, 3100, 3100a:
330: tube 340: pressure switch

Claims (9)

(A) mixing a titanium (Ti) powder, a titanium hydrogen compound (TiHx) powder, a reducing agent, and a binder to prepare a mixture;
(B) granulating the mixture to produce a raw material powder;
(C) injection-molding the raw material powder to form a formed body; And
(D) degreasing the molded body;
Wherein the hydrogen storage molded article is a hydrogen storage molded article.
The method according to claim 1,
Wherein the molar ratio (x) of hydrogen (H) to titanium (Ti) is 1.7 to 2 in the titanium hydrogen compound.
The method according to claim 1,
Wherein the reducing agent is at least one of magnesium (Mg) and aluminum (Al).
The method according to claim 1,
Wherein the binder is at least one of naphthalene and paraffin wax.
The method according to claim 1,
Wherein the step (C) comprises injection molding the molded body into a wire shape.
The method according to claim 1,
The step (C)
And extruding the molded product injection-molded in a predetermined shape into a wire shape.
The method according to claim 1,
Sintering the degreased molded body;
Further comprising the steps of:
The method according to claim 1,
Injecting hydrogen into the degreased molded body;
Further comprising the steps of:
The method of claim 8,
Wherein the molded article to which the hydrogen is injected releases the hydrogen by heat when a fire occurs to change the pressure of the gas to detect a fire.

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