JP2002030373A - High specific gravity composite material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive W-based high specific gravity composite material solved in the defects of the conventional integrated type material as the use for damping, having a high damping capacity which has not been exhibited heretofore, high in workability, easy to be formed into various shapes and having a high radiation shielding capacity which has not been exhibited heretofore as the use for radiation shielding. SOLUTION: By obtaining a sintered body containing one or more kinds selected from In, Sn, Sb, Tl and Bi of 15 to 90 wt.%, and the balance W or a material in which one or more kinds selected from In, Sn, Sb, Tl and Bi of 15 to 90 wt.% are infiltrated into a W skeleton containing one or more kinds selected from Ni, Cu and Co of 0.3 to 3 wt.% on the surface, the inexpensive high specific gravity composite material provided with good damping and radiation shielding properties can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high specific gravity composite material used for vibration suppression, radiation shielding and the like.

[0002]

2. Description of the Related Art Vibration damping materials are broadly classified into an integral type and a laminated type in which plates are laminated. Recently, damping steel sheets, which are one of the laminated types, have been developed. Since the damping steel sheet has a laminated structure of steel sheet and resin or other materials, there is a fatal restriction on weldability, formability, and size and shape of the product, and therefore, great results are mainly obtained for container or cover applications. Have been reported. On the other hand, materials having an integral structure do not have such restrictions, and there are many studies so far. Mn-Cu alloys, Cu-Mn alloys, aluminum bronze, magnesium alloys, nitinol and the like are known. Actually, Cu-Mn based alloys have been developed based on Cu. However, these are all cast materials, and have poor workability and insufficient performance. Alloys used for conventional radiation shielding include stainless steel, lead, and heavy alloys. However, stainless steel and lead have low specific gravities and insufficient shielding properties, and therefore, have to be increased in volume to ensure predetermined performance. Lead itself is toxic, and its toxicity persists even after disposal, so its use tends to be limited by environmental protection. On the other hand, heavy alloys have excellent shielding properties but are disadvantageous in that they are not economical.

[0003]

SUMMARY OF THE INVENTION The present invention eliminates the drawbacks of conventional integrated materials for vibration damping applications, has unprecedented high vibration damping performance, has good workability, and can cope with various shapes. It is another object of the present invention to provide a low-priced, low-cost, high-specific-gravity W-based composite material having high radiation shielding performance, which has never been achieved before, as a radiation shielding application.

[0004]

According to the present invention, as a result of conducting research focusing on W having a high specific gravity from the above viewpoint, vibration suppression,
In order to obtain a high specific gravity composite material having radiation shielding properties, In,
One or more powders of Sn, Sb, Tl, Bi
It is characterized in that 90% by weight and the remainder W powder are mixed, molded by pressing or the like, and then sintered. In, Sn, Sb, Tl, B
If at least one of i is less than 15% by weight, the amount of the liquid phase is insufficient, and sufficient sintered body strength cannot be obtained. On the other hand, if it exceeds 90% by weight, the specific gravity decreases, and it is not possible to improve the vibration damping property and the radiation shielding property, so that In, Sn, Sb, T
The amount of the species 1 and Bi is preferably 15 to 90% by weight. In the case of manufacturing by the infiltration method which is more economical than the sintering method, since wettability is poor and infiltration is not performed, in order to improve wettability at the time of infiltration, In, Sn, Sb, Tl, and Bi At least one of 15 to 90% by weight is infiltrated into a W skeleton containing 0.3 to 3% by weight of one or more of Ni, Cu, and Co on a surface thereof. If at least one of Ni, Cu, and Co is smaller than 0.3% by weight, the wettability is deteriorated and no infiltration occurs. On the other hand, if it exceeds 3% by weight, the specific gravity decreases, and it is not possible to expect improvement in vibration damping properties and radiation shielding properties.
The amount of at least one of i, Cu, and Co is desirably 0.3 to 3% by weight. Here, W is a material obtained by combining powders of two or three kinds of particle diameters as described in claims 3 and 4, and one or more of In, Sn, Sb, Tl, and Bi are used for 15 or more. A high specific gravity composite material in which tungsten particles are closest packed is obtained by infiltrating by ~ 90 wt%. When the specific gravity is less than 10, the vibration damping property and the radiation shielding property are not sufficient, and when the specific gravity is more than 17, the vibration damping property and the radiation shielding property are only 17 by increasing the usage of W.
Since the cost is uneconomical regardless of the specific gravity, the specific gravity may be 10 or more and 17 or less. The present invention provides W- (0.
3-3) A hydrogen gas stream of 800 ° C. or more after tapping filling of a weight% Ni powder into a carbon mold or placing an ingot of Bi on a pressed compact of W- (0.3-3) weight% Ni It can be obtained by infiltrating in the inside.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is characterized in that In, S
a high specific gravity composite material containing 15 to 90% by weight of at least one of n, Sb, Tl and Bi, with the balance being W
-Has vibration damping and radiation shielding properties higher than those of Mn-based alloy, stainless steel and lead. The invention according to claim 2 contains at least one of Ni, Cu, and Co at 0.3 to 3% by weight, and at least one of In, Sn, Sb, Tl, and Bi at 15 to 90% by weight. The remaining portion is made of W. However, when the present invention according to claim 1 is manufactured by an infiltration method which is more economical than the sintering method, wettability is poor and infiltration is not performed. In, S to improve wettability at the time
at least one of n, Sb, Tl, and Bi in an amount of 15 to 90% by weight
Is produced by infiltrating at least one of Ni, Cu, and Co into a W skeleton containing 0.3 to 3% by weight on the surface, and is compared with Cu-Mn alloy, stainless steel, and lead. Even more than these, it has vibration suppression and radiation shielding properties,
It is more economical than heavy alloys. The third aspect of the present invention is to improve the packing property of W so as to be the closest packing by combining a group of particles having different distributions of W particles, and to enhance the vibration damping and radiation shielding effects of W. The invention according to claim 4 relates to the specific particle size and the compounding ratio of the particle group. By adopting this compounding, the filling property of the W particles is improved, the packing becomes close-packed, and the material of the present invention has vibration damping and radiation shielding. The effect can be enhanced. The invention according to claim 5 is the high specific gravity composite material according to any one of claims 1 to 4, wherein the specific gravity is from 10 to 17, and if the specific gravity is less than 10, it is conventionally used. Vibration damping and radiation shielding properties are the same as those of Cu-Mn-based alloys, stainless steel, and lead, and there is no advantage. At a specific gravity of 17, it has almost the same vibration damping and radiation shielding properties as a heavy alloy. Hereinafter, the present invention will be described in detail with reference to examples.

[0006]

EXAMPLES A high-density composite material of the present invention, a comparative sample, and a sample for a physical property test using stainless steel, lead, and heavy alloy,
A sample for γ-ray shielding test (thickness: 20 mm) was prepared, and the specific gravity, γ-ray transmittance, vibration damping, and shielding performance were compared. Example 1 50 wt% of W powder, 5 wt% of Sn powder, and 45 wt% of Bi powder were mixed, molded, and sintered at 900 ° C. to produce a high specific gravity composite material of the present invention. 5 W powder as a comparative sample
% Of Sn powder, 5% by weight of Sn powder, and 90% by weight of Bi powder.
Heavy alloy was used. The specific gravities of the same components as those of the present invention but having different contents, stainless steel and lead were 9.7, 8.0 and 11.2, respectively. The specific gravity of the high specific gravity composite material of the present invention is 12.5, and 16.8 of heavy alloy.
Although smaller than that of the present invention, those having the same components as those of the present invention but containing different amounts of components, the specific gravity was higher than that of stainless steel and lead.
Comparing the γ-ray transmittance, when the heavy alloy is set to 1, the components similar to those of the present invention and having different contents are 1.67, and stainless steel and lead are 2.2 and 1.54, respectively.
Met. The high specific gravity composite material of the present invention was 1.33, which was found to be superior to those of the present invention in terms of radiation shielding properties as compared with those of the present invention, which were different from those containing stainless steel and lead.
At least one of In, Sn, Sb, Tl, and Bi
Similar results were obtained for other high specific gravity composite materials containing 90% by weight and the balance being W. Example 2 64.5% by weight of W powder and 1.5% by weight of Ni powder were mixed, filled in a carbon mold, placed on a Bi ingot, and infiltrated in a hydrogen stream at 800 ° C. to form a main body. An inventive high specific gravity composite material was produced. As a comparative sample, 5% by weight of W powder, Ni
After mixing 0.3% by weight of the powder and filling in a carbon mold, a Bi ingot was placed thereon and infiltrated under the same conditions, and commercially available stainless steel, lead, and heavy alloy were used. The specific gravity of a sample having the same component as that of the present invention but having a different component content was 9.8, and the values of stainless steel and lead were 8.0 and 11.2, respectively. Although the specific gravity of the high specific gravity composite material of the present invention is 14.2, which is smaller than 16.8 of the heavy alloy, the specific gravity is higher than that of the sample, stainless steel, and lead which are similar to the present invention and have different component contents. there were. When the γ-ray transmittances were compared, when the heavy alloy was set to 1, the samples of the same type as the present invention and having different component contents were 1.67, and those of stainless steel and lead were 2.2 and 1.54, respectively. The high specific gravity composite material of the present invention was 1.18, and it was found that it had better shielding properties than samples of the same type as the present invention but having different component contents, stainless steel, and lead. Containing 0.3 to 3% by weight of one or more of Ni, Cu, and Co, and containing In, Sn, Sb, Tl, and B
i in an amount of 15 to 90% by weight, with the balance being W
The same results were obtained for other high specific gravity composite materials consisting of the following, except that the ingot of Bi was placed on a compact formed by mixing 83.5% by weight of W powder and 1.5% by weight of Ni powder. 80
The specific gravity of the high specific gravity composite material of the present invention produced by infiltration in a hydrogen stream at 0 ° C. is 16.6, and the γ-ray transmittance is 1.01.
Was almost equivalent to a heavy alloy. Example 3 W powders having an average particle diameter of 12 μm, 4 μm, and 1 μm were mixed at a blending ratio of 75% by weight, 15% by weight, and 15% by weight, respectively, and the W powder was 64.5% by weight, and the Ni powder was 1.5% by weight. %, And filled in a carbon mold. Then, a Bi ingot was placed thereon and infiltrated in a hydrogen stream at 800 ° C. to produce a high specific gravity composite material of the present invention. The comparative sample was produced by using only W powder having an average particle diameter of 4 μm and infiltrating under exactly the same conditions as the material of the present invention except for the particle diameter. The specific gravity of the comparative sample is 11.4,
The specific gravity of the high specific gravity composite material of the present invention was 14.2. It can be seen that a high specific gravity composite material can be obtained by setting the particle diameter and the amount of compounding as described in claim 3 or 4. Example 4 The high specific gravity material of the present invention used in Examples 1 to 3 was attached to a container of a personal computer external storage device, and vibration and noise were measured using a vibration measuring device and a noise measuring device. Vibration suppression and sound insulation performance several times higher than conventional Cu-Mn alloys and stainless steel were exhibited.

[0007]

The high specific gravity composite material of the present invention has a specific gravity of 10 to 10.
17, a conventional Cu-Mn-based alloy as a vibration damping application,
It eliminates the disadvantages of stainless steel, has unprecedented high vibration damping performance, and has good workability, so it can be used in a variety of shapes. Further, it has unprecedentedly high radiation performance and has low toxicity for use as a radiation shielding application. Therefore, when used as a substitute for stainless steel and lead, the volume becomes small and space can be saved. Also, it can be used as an alternative to heavy alloys because of its low manufacturing cost.

Claims (5)

[Claims] 1. A high specific gravity composite material comprising 15 to 90% by weight of at least one of In, Sn, Sb, Tl, and Bi and the balance being W. 2. The high specific gravity composite material according to claim 1, wherein 0.3 to 3% by weight is replaced by one or more of Ni, Cu and Co. 3. The method according to claim 1, wherein at least one of Ni, Cu, and Co is added to 0.3.
-3% by weight of a large W having an average particle diameter of 7-25 μm and a small W having an average particle diameter of less than 2.0 μm, or one or more of Ni, Cu and Co contained in a surface of 0.3 to 0.3% by weight. ~
Large W having an average particle diameter of 7 to 25 μm and medium W having an average particle diameter of 2 to 4 μm contained on a 3 wt% surface.
In, Sn, Sb, T are placed in the gaps of the W skeleton, where W and the small W particles having an average particle diameter of less than 2.0 μm are alternately dispersed.
The high specific gravity composite material according to claim 2, comprising a composite material in which at least one of l and Bi is infiltrated and filled by 15 to 90% by weight. 4. The particle size of W is composed of a combination of a large particle group, a medium particle group and a small particle group, wherein the large particle group is powder having an average particle diameter of 7 to 25 μm, and the medium particle group is an average particle diameter. Two
4 μm powder, and the small particle group is a powder having an average particle diameter of less than 2.0 μm, and the large particle group is 60 to 80 μm.
The small particle group comprises 4 to 19% by weight, and the remainder comprises a medium particle group.
High specific gravity composite material according to any of the above 5. The high specific gravity composite material according to claim 1, wherein the specific gravity is 10 to 17.