18K gold, spring, elastic sheet and manufacturing method thereof

Abstract

The invention relates to 18K gold, a spring, an elastic piece and a manufacturing method of the 18K gold. The 18K gold comprises the following components: 75.3-76.3% of gold; 5.1%-9.5% of silver; 4.5%-10% of copper; 1.5%-3.5% of nickel; 0.3% to 2.5% of aluminum; 0.2%-0.9% of silicon; 1.3% to 1.5% of titanium; 0.4%-1% of iron; 0.5%-0.7% of lanthanum; and 0.5 to 0.6 percent of chromium. The 18K gold contains nickel, aluminum and silicon, one or two or more intermetallic compounds can be separated out through reaction, the compounds are fine and hard, the hardness and strength of the 18K gold can be improved, and the 18K gold can be suitable for being made into springs and elastic pieces used in precious metal jewelry.

Description

Technical Field

[0001] The invention relates to the technical field of precious metals, and in particular to 18K gold, a spring, a spring sheet and a manufacturing method thereof. Background Art

[0002] Gold jewelry can be divided into pure gold and K gold according to its content. The gold content of pure gold jewelry or jewellery is required to be above 99%, and the highest can reach 99.99%. Pure gold is relatively soft and easy to deform and wear. In order to overcome this shortcoming, some other metal elements are usually added to gold to adjust its properties, thus making K gold. K gold is divided into 22K gold, 18K gold, 14K gold, etc. according to the gold content. The gold content of 1K gold is about 1 / 24, that is, 4.166%, and the gold content of 18K gold is 75%.

[0003] At present, the springs and shrapnel used in the buckles of gold jewelry such as necklaces, earrings, cufflinks, etc. are usually made of materials such as stainless steel to obtain suitable elasticity, which greatly reduces the overall gold content of gold jewelry. Therefore, it is urgent to provide a new solution. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide an 18K gold, a spring, a spring sheet and a manufacturing method thereof, so as to solve the problem that the existing 18K gold cannot meet the spring and spring sheet manufacturing requirements due to its strength and elasticity, and stainless steel springs and spring sheets are used to affect the overall gold content of the jewelry.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides an 18K gold comprising the following components:

[0007] Gold 75.3% ~ 76.3%;

[0008] Silver 5.1% to 9.5%;

[0009] Copper 4.5% to 10%;

[0010] Nickel 1.5% to 3.5%;

[0011] Aluminum 0.3% to 2.5%;

[0012] Silicon 0.2% to 0.9%;

[0013] Titanium 1.3% to 1.5%;

[0014] Iron 0.4% to 1%;

[0015] Lanthanum 0.5% to 0.7%;

[0016] Chromium 0.5~0.6%.

[0017] A further improvement of the 18K gold of the present invention is that it also includes 0.4% to 0.5% of cobalt and 0.3% to 0.4% of ruthenium.

[0018] The present invention also provides a method for making an 18K gold spring, comprising the following steps:

[0019] Providing the above-mentioned 18K gold raw material, melting and casting the provided 18K gold raw material to obtain a K gold ingot;

[0020] Tempering the K gold ingot and cold rolling it into K gold wire;

[0021] Tempering the K gold wire and cold drawing it into K gold wire at room temperature;

[0022] Heat the K gold wire at 330℃~380℃ for 0.5h~1h;

[0023] The heat-insulated K gold wire is wound into a K gold spring.

[0024] A further improvement of the method for making the 18K gold spring of the present invention is that when providing the 18K gold raw material, the nickel, aluminum and silicon in the 18K gold raw material are pre-smelted into alloy particles;

[0025] The alloy particles are then mixed and melted with the remaining components of the 18K gold raw material.

[0026] A further improvement of the method for making the 18K gold spring of the present invention is that pre-melting nickel, aluminum and silicon into alloy particles comprises the following steps:

[0027] Put nickel and silicon into a vacuum melting furnace to melt and mix them evenly;

[0028] The temperature of the vacuum melting furnace is adjusted to 700°C ± 50°C, and aluminum is put into the vacuum melting furnace to be melted and mixed evenly;

[0029] The temperature of the vacuum melting furnace is raised to 1300°C ± 50°C and the mixture is mixed uniformly to obtain a molten alloy;

[0030] pouring the alloy melt into water and cooling it to obtain alloy particles;

[0031] The alloy particles are heat-treated at 330° C. to 380° C. for 5 to 50 minutes to obtain pre-smelted alloy particles.

[0032] A further improvement of the method for making the 18K gold spring of the present invention is that it also includes pre-smelting the titanium and chromium in the 18K gold raw material together with the nickel, aluminum and silicon into alloy particles.

[0033] A further improvement of the method for manufacturing the 18K gold spring of the present invention is that after the K gold spring is wound, the K gold spring is kept at a temperature of 370° C. to 380° C. for 30 min to 45 min, and then rapidly cooled in water for quenching;

[0034] The K gold spring is kept at a temperature of 300° C. to 320° C. for 30 min to 45 min, and naturally cooled to room temperature, thereby obtaining an 18K gold spring.

[0035] The present invention further provides an 18K gold spring, which is manufactured by adopting the manufacturing method of the 18K gold spring.

[0036] The present invention further provides a method for manufacturing an 18K gold shrapnel, comprising the following steps:

[0037] Providing the 18K gold raw material as claimed in claim 1, melting the provided 18K gold raw material and preparing a K gold shrapnel;

[0038] The K gold shrapnel is heat-treated at 330°C to 380°C for 0.5h to 1h, thereby completing the production of the 18K gold shrapnel.

[0039] The present invention further provides an 18K gold shrapnel, which is manufactured by adopting the manufacturing method of the 18K gold shrapnel.

[0040] The beneficial effects of the 18K gold, spring, spring sheet and the manufacturing method thereof of the present invention are as follows:

[0041] The 18K gold of the present invention contains a variety of strengthening elements, which can improve the hardness, strength, elasticity, flexibility and stability of the 18K gold. The 18K gold has high yield strength, and both fatigue resistance and processing performance are relatively excellent.

[0042] In the 18K gold of the present invention, nickel, aluminum and silicon can react to obtain Ni 3 Al, Ni 3 Si、Ni 2 Al, Ni 2 Si and Ni 5 Si 2 Any one or two or more intermetallic compounds, which are fine and hard and can improve the hardness and strength of 18K gold.

[0043] In the 18K gold of the present invention, silver can form a solid solution with gold to improve the hardness and strength of the 18K gold. Copper is also an important solid solution element, which can improve the hardness and strength of the 18K gold, and also improve the stability and corrosion resistance of the 18K gold.

[0044] In the 18K gold of the present invention, titanium, chromium and cobalt can promote the formation of nickel, aluminum and silicon precipitation compounds; nickel and titanium can also improve the elasticity of 18K gold; chromium can also increase the quenching permeability of 18K gold; iron can improve the hardenability and fatigue resistance of 18K gold, and it also affects the elasticity of 18K gold; lanthanum can improve the yield strength and flexibility of 18K gold, and can also improve the corrosion resistance of 18K gold. Ruthenium can increase the hardness of 18K gold.

[0045] In the manufacturing method of the 18K gold spring and the 18K gold spring of the present invention, by subjecting the K gold wire to heat preservation treatment at 330°C to 380°C for 0.5h to 1h, nickel, aluminum and silicon can precipitate corresponding intermetallic compounds, thereby improving the strength, hardness and thermal fatigue resistance of the gold spring. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with specific embodiments.

[0047] The present invention provides 18K gold, a spring, a shrapnel and a manufacturing method thereof, which are used to solve the problem of reduced gold content caused by the use of stainless steel springs and shrapnel in existing gold ornaments and jewelry such as necklaces, earrings, cufflinks and other buckles. The 18K gold, 18K gold spring, 18K gold shrapnel and a manufacturing method thereof of the present invention provide 18K gold containing a variety of strengthening elements, aiming to improve the hardness, strength, elasticity, flexibility, corrosion resistance and stability of 18K gold, which can meet the elastic performance requirements of the spring and the processing requirements of gold ornaments and jewelry, thereby ensuring the gold content in the gold ornaments and jewelry. The 18K gold, spring, shrapnel and a manufacturing method thereof of the present invention are described below.

[0048] The present invention provides an 18K gold comprising the following components:

[0049] Gold 75.3% ~ 76.3%;

[0050] Silver 5.1% to 9.5%;

[0051] Copper 4.5% to 10%;

[0052] Nickel 1.5% to 3.5%;

[0053] Aluminum 0.3% to 2.5%;

[0054] Silicon 0.2% to 0.9%;

[0055] Titanium 1.3% to 1.5%;

[0056] Iron 0.4% to 1%;

[0057] Lanthanum 0.5% to 0.7%;

[0058] Chromium 0.5~0.6%.

[0059] In a specific embodiment of the present invention, the 18K gold of the present invention further comprises 0.4% to 0.5% of cobalt and 0.3% to 0.4% of ruthenium.

[0060] In a specific embodiment of the present invention, the composition of the 18K gold of the present invention specifically includes: 75.5% gold; 5.4% silver; 9.8% copper; 2.5% nickel; 2% aluminum; 0.8% silicon; 1.5% titanium; 0.5% iron; 0.5% lanthanum; 0.6% chromium; 0.5% cobalt and 0.4% ruthenium.

[0061] In a specific embodiment of the present invention, the composition of the 18K gold of the present invention specifically includes: 75.8% gold; 8.2% silver; 7.3% copper; 2.8% nickel; 1.5% aluminum; 0.4% silicon; 1.4% titanium; 0.6% iron; 0.7% lanthanum; 0.5% chromium; 0.5% cobalt and 0.3% ruthenium.

[0062] The 18K gold of the present invention contains nickel, aluminum and silicon, which can react and precipitate Ni 3 Al, Ni 3 Si、Ni 2 Al, Ni 2 Si and Ni 5 Si 2 Any one or two or more intermetallic compounds in the present invention are fine and hard, which can improve the hardness and strength of 18K gold, making it suitable for making springs used in precious metal jewelry. Furthermore, the addition of titanium, chromium and cobalt in the 18K gold of the present invention can promote the formation of nickel, aluminum and silicon precipitation compounds.

[0063] The addition of iron, silver and ruthenium in the 18K gold of the present invention can make up for the relatively soft physical property of gold, so that the 18K gold can be suitable for making springs used in precious metal jewelry, and the elasticity, hardness, toughness and strength of the springs are ensured.

[0064] The alloy elements in the 18K gold of the present invention have good solid solubility and can be directly smelted with gold with little loss. The prepared 18K gold spring has good elasticity, is not easily deformed after long-term use, and is not easily oxidized and discolored when worn.

[0065] The silver in the 18K gold of the present invention can improve the hardness and strength of the 18K gold. Copper can also improve the hardness and strength of the 18K gold, and can also improve the stability and corrosion resistance of the 18K gold. Nickel and titanium can also improve the elasticity of the 18K gold; chromium can also increase the quenching permeability of the 18K gold; iron can improve the hardenability and fatigue resistance of the 18K gold, and it also affects the elasticity of the 18K gold; lanthanum can improve the yield strength and flexibility of the 18K gold, and can also improve the corrosion resistance of the 18K gold. Ruthenium can increase the hardness of the 18K gold.

[0066] The present invention also provides a method for manufacturing an 18K gold spring. The method for manufacturing the 18K gold spring is described below.

[0067] The manufacturing method of the 18K gold spring of the present invention comprises the following steps:

[0068] S11, providing the above-mentioned 18K gold raw material, and melting and casting the provided 18K gold raw material to obtain a K gold ingot;

[0069] S12, tempering the K gold ingot and cold rolling it into K gold wire;

[0070] S13, tempering the K gold wire and cold drawing it into K gold wire at room temperature;

[0071] S14, heat-treating the K gold wire at 330°C to 380°C for 0.5h to 1h;

[0072] S15, winding the heat-insulated K gold wire into a K gold spring.

[0073] In a specific embodiment of the present invention, in step S11, when providing 18K gold raw material, nickel, aluminum and silicon in the 18K gold raw material are pre-smelted into alloy particles;

[0074] The alloy particles are then mixed and melted with the remaining components of the 18K gold raw material.

[0075] That is, before melting and casting the 18K gold raw material to obtain the K gold ingot, nickel, aluminum and silicon are melted into alloy particles in advance.

[0076] Preferably, the raw material of 18K gold is metal particles or metal powder.

[0077] Further, pre-smelting nickel, aluminum and silicon into alloy particles comprises the following steps:

[0078] Put nickel and silicon into a vacuum melting furnace to melt and mix them evenly;

[0079] Adjust the temperature of the vacuum melting furnace to 700℃±50℃, put aluminum into the vacuum melting furnace to melt and mix evenly;

[0080] Raise the temperature of the vacuum melting furnace to 1300°C ± 50°C and mix uniformly to obtain a molten alloy;

[0081] pouring the alloy melt into water and cooling it to obtain alloy particles;

[0082] The alloy particles are heat-treated at 330° C. to 380° C. for 5 to 50 minutes to obtain pre-smelted alloy particles.

[0083] Among them, when the alloy melt is poured into water to cool and obtain alloy particles, the alloy melt is dripped into water to cool and form alloy particles. The water is cooling water, and its temperature can be maintained at a set temperature, such as 0°, or 1°, etc. The cooling water needs to flow to maintain the temperature of the water constant. In the smelting process, high-melting-point metal elements are first added. After complete melting, the temperature is lowered and low-melting-point metal elements are added. This can reduce the political loss of low-melting-point metal elements during the smelting process and ensure the accuracy of the composition ratio of the alloy particles. Finally, the alloy melt is fully mixed by heating for a short time. After obtaining the alloy particles, the alloy particles are heat-treated at 330°C to 380°C for 5min to 50min, so that nickel, aluminum and silicon can react to precipitate Ni 3 Al, Ni 3 Si、Ni 2 Al, Ni 2 Si and Ni 5 Si 2 Any one or two or more intermetallic compounds in the alloy can be formed, and the precipitated compounds are hard and can improve the overall strength of the alloy particles.

[0084] Furthermore, the method further includes pre-smelting titanium and chromium in the 18K gold raw material together with nickel, aluminum and silicon into alloy particles.

[0085] Furthermore, when 18K gold includes cobalt, the cobalt is also pre-smelted together with nickel, aluminum and silicon into alloy particles.

[0086] Specifically, titanium, chromium or titanium, chromium and cobalt are put into a vacuum melting furnace to melt and mix evenly, and the temperature of the vacuum melting furnace is about 1700℃±50℃; the temperature of the vacuum melting furnace is adjusted to about 1500℃±50℃, nickel and silicon are hooked into the vacuum melting furnace to melt and mix evenly; the temperature of the vacuum melting furnace is adjusted to 700℃±50℃, and aluminum is put into the vacuum melting furnace to melt and mix evenly; the temperature of the vacuum melting furnace is increased to 1300℃±50℃ and mixed evenly to obtain an alloy melt; the alloy melt is poured into water to cool to obtain alloy particles; the alloy particles are heat-treated at 330℃~380℃ for 5min~50min, thereby obtaining pre-smelted alloy particles.

[0087] The addition of titanium, chromium and cobalt can promote the reaction of nickel, aluminum and silicon to precipitate compounds.

[0088] In a specific embodiment of the present invention, in step S11, the K gold ingot obtained by casting is cylindrical, and the mold is preheated before casting.

[0089] In a specific embodiment of the present invention, in step S12, after the karat gold ingot is cooled, annealing heating is performed at a temperature of about 450° C. to eliminate the internal stress generated in the karat gold ingot during the casting process. After annealing, the karat gold ingot is subjected to multiple cold rolling to obtain a karat gold wire.

[0090] In a specific embodiment of the present invention, in step S13, the K gold wire is annealed and heated at a temperature of about 450°C to eliminate the stress generated during the rolling process, and then the K gold wire is drawn through a wire drawing device to obtain a K gold wire, and the wire diameter of the K gold wire is between 0.1mm and 0.3m (including the end values).

[0091] In a specific embodiment of the present invention, in step 14, the K gold wire is heat-treated at 330°C to 380°C for 0.5h to 1h to allow nickel, aluminum and silicon to react and precipitate Ni 3 Al, Ni 3 Si、Ni 2 Al, Ni 2 Si and Ni 5 Si 2 Any one or two or more intermetallic compounds in the K gold wire are deposited. At this time, the precipitated compounds are located on the surface of the K gold wire, and the precipitated compounds are hard and can improve the overall strength of the K gold wire.

[0092] In a specific embodiment of the present invention, after the K gold spring is wound, the K gold spring is kept at a temperature of 370° C. to 380° C. for 30 min to 45 min, and then rapidly cooled in water for quenching;

[0093] The K gold spring is kept at a temperature of 300°C to 320°C for 30min to 45min, and naturally cooled to room temperature, thereby obtaining an 18K gold spring.

[0094] The K gold spring is subjected to two heat preservation treatments to maximize the reaction of nickel, aluminum and silicon on the surface of the K gold spring to precipitate Ni 3 Al, Ni 3 Si、Ni 2 Al, Ni 2 Si and Ni 5 Si 2 Any one or two or more intermetallic compounds in the K gold spring can improve the strength of the K gold spring. After the first heat preservation treatment, it is rapidly cooled and quenched to improve the flexibility and fatigue resistance of the K gold spring.

[0095] Furthermore, the wire diameter of the K gold spring is 0.1 mm to 0.3 mm.

[0096] The present invention further provides an 18K gold spring, which is manufactured by adopting the manufacturing method of the 18K gold spring.

[0097] In order to illustrate the technical performance of the K gold spring of the present invention, the present invention conducted the following performance tests: First, examples and comparative examples were prepared, and the following examples and comparative examples were prepared in weight percentage (wt%).

[0098] Embodiment 1: The composition of the 18K gold spring includes: 75.5% gold; 5.4% silver; 9.8% copper; 2.5% nickel; 2% aluminum; 0.8% silicon; 1.5% titanium; 0.5% iron; 0.5% lanthanum; 0.6% chromium; 0.5% cobalt and 0.4% ruthenium. The manufacturing method adopts the manufacturing method of the 18K gold spring of the present invention.

[0099] Embodiment 2: The composition of the 18K gold spring includes: 75.8% gold; 8.2% silver; 7.3% copper; 2.8% nickel; 1.5% aluminum; 0.4% silicon; 1.4% titanium; 0.6% iron; 0.7% lanthanum; 0.5% chromium; 0.5% cobalt and 0.3% ruthenium. The manufacturing method adopts the manufacturing method of the 18K gold spring of the present invention.

[0100] Embodiment 3: The composition of the 18K gold spring includes: 76% gold; 9% silver; 8.3% copper; 1.6% nickel; 0.8% aluminum; 0.3% silicon; 1.3% titanium; 0.8% iron; 0.6% lanthanum; 0.5% chromium; 0.4% cobalt and 0.4% ruthenium. The manufacturing method adopts the manufacturing method of the 18K gold spring of the present invention.

[0101] Comparative Example 1: An existing gold spring mainly composed of gold, silver, copper and zinc includes 75.5% gold, 23% copper, 1% silver and 0.5% zinc.

[0102] Comparative Example 2: An existing gold spring mainly composed of gold, silver, copper and zinc includes 75.8% gold, 20% copper, 3.2% silver and 1% zinc.

[0103] Test 1:

[0104] The test was carried out according to the method specified in GB / T 35777 "Mechanical Properties Test Tensile Test of Metal and Alloy Jewelry Chains". A Class 1 tensile testing machine was selected. The two ends of the gold spring were clamped by a fixture. The gold springs of Examples 1 to 3 and Comparative Examples 1 and 2 were subjected to tensile tests respectively. The test conditions were: the tensile speed was 20 mm / min, the sample was stretched and extended until the spring wire broke, and the maximum tensile force (unit N) was recorded. The test results are shown in Table 1 below:

[0105] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Maximum pulling force 38.7 36.5 35.4 13.6 12.1

[0106] Table 1 Gold spring tensile performance test results.

[0107] It can be seen from the test results in Table 1 that the 18K gold springs of Examples 1 to 3 of the present invention have greater maximum tension than the 18K gold springs of Comparative Examples 1 and 2, and the 18K gold springs of the present invention have higher strength and better durability.

[0108] Fatigue test was carried out according to the test method specified in GB / T 16947-2009 "Fatigue Test Specification for Coil Springs". The test conditions were: load 0.30N, test frequency 20Hz, stroke 2.0mm, and the number of cycles when the spring broke was recorded (in ten thousand times). The test results are shown in Table 2 below:

[0109] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Cycle times 198 193 187 49 52

[0110] Table 2 Gold spring fatigue performance test results.

[0111] It can be seen from the test results in Table 2 that the 18K gold springs of Examples 1 to 3 of the present invention have better fatigue resistance and longer service life than the 18K gold springs of Comparative Examples 1 and 2.

[0112] The 18K gold, spring, spring piece and manufacturing method thereof of the present invention have the advantages of strong machinability and not easy to deform, and can improve the strength and toughness of 18K gold while ensuring the gold content, and have stable glossiness and are not easy to fade, so they are suitable for application to precious metal ornaments and high-end precious jewelry.

[0113] The present invention further provides a method for manufacturing an 18K gold shrapnel, and the method for manufacturing the 18K gold shrapnel is described below.

[0114] The method for making the 18K gold shrapnel of the present invention comprises the following steps:

[0115] Providing the above-mentioned 18K gold raw material, melting the provided 18K gold raw material and preparing a K gold shrapnel;

[0116] The prepared K gold shrapnel is heat-treated at 330° C. to 380° C. for 0.5 h to 1 h, thereby completing the production of the 18K gold shrapnel.

[0117] In a specific embodiment of the present invention, the method of melting 18K gold raw material and preparing K gold shrapnel includes using a mold, melting the 18K gold raw material and casting it into the mold to obtain an 8K gold shrapnel. Preferably, the K gold shrapnel is a flat sheet.

[0118] Alternatively, a stamping die is used to melt the 18K gold raw material and then cast it into the stamping die, and then a press is used to stamp out the K gold spring piece.

[0119] Preferably, the thickness of the K-gold spring is between 0.1 mm and 0.3 mm (including the end values).

[0120] Furthermore, the prepared K-gold spring piece is cold rolled according to the required size.

[0121] Furthermore, when providing 18K gold raw material, nickel, aluminum and silicon in the 18K gold raw material are pre-smelted into alloy particles;

[0122] The alloy particles are then mixed and melted with the remaining components of the 18K gold raw material.

[0123] That is, before melting the 18K gold raw material to make the K gold shrapnel, nickel, aluminum and silicon are melted into alloy particles in advance.

[0124] Preferably, the raw material of 18K gold is metal particles or metal powder.

[0125] Further, pre-smelting nickel, aluminum and silicon into alloy particles comprises the following steps:

[0126] Put nickel and silicon into a vacuum melting furnace to melt and mix them evenly;

[0127] Adjust the temperature of the vacuum melting furnace to 700℃±50℃, put aluminum into the vacuum melting furnace to melt and mix evenly;

[0128] Raise the temperature of the vacuum melting furnace to 1300°C ± 50°C and mix uniformly to obtain a molten alloy;

[0129] pouring the alloy melt into water and cooling it to obtain alloy particles;

[0130] The alloy particles are heat-treated at 330° C. to 380° C. for 5 to 50 minutes to obtain pre-smelted alloy particles.

[0131] Among them, when the alloy melt is poured into water to cool and obtain alloy particles, the alloy melt is dripped into water to cool and form alloy particles. The water is cooling water, and its temperature can be maintained at a set temperature, such as 0°, or 1°, etc. The cooling water needs to flow to maintain the temperature of the water constant. In the smelting process, high-melting-point metal elements are first added. After complete melting, the temperature is lowered and low-melting-point metal elements are added. This can reduce the political loss of low-melting-point metal elements during the smelting process and ensure the accuracy of the composition ratio of the alloy particles. Finally, the alloy melt is fully mixed by heating for a short time. After obtaining the alloy particles, the alloy particles are heat-treated at 330°C to 380°C for 5min to 50min, so that nickel, aluminum and silicon can react to precipitate Ni 3 Al, Ni 3 Si、Ni 2 Al, Ni 2 Si and Ni 5 Si 2Any one or two or more intermetallic compounds in the alloy can be formed, and the precipitated compounds are hard and can improve the overall strength of the alloy particles.

[0132] Furthermore, the method further includes pre-smelting titanium and chromium in the 18K gold raw material together with nickel, aluminum and silicon into alloy particles.

[0133] Furthermore, when 18K gold includes cobalt, the cobalt is also pre-smelted together with nickel, aluminum and silicon into alloy particles.

[0134] Specifically, titanium, chromium or titanium, chromium and cobalt are put into a vacuum melting furnace to melt and mix evenly, and the temperature of the vacuum melting furnace is about 1700℃±50℃; the temperature of the vacuum melting furnace is adjusted to about 1500℃±50℃, nickel and silicon are hooked into the vacuum melting furnace to melt and mix evenly; the temperature of the vacuum melting furnace is adjusted to 700℃±50℃, and aluminum is put into the vacuum melting furnace to melt and mix evenly; the temperature of the vacuum melting furnace is increased to 1300℃±50℃ and mixed evenly to obtain an alloy melt; the alloy melt is poured into water to cool to obtain alloy particles; the alloy particles are heat-treated at 330℃~380℃ for 5min~50min, thereby obtaining pre-smelted alloy particles.

[0135] The addition of titanium, chromium and cobalt can promote the reaction of nickel, aluminum and silicon to precipitate compounds.

[0136] In a specific embodiment of the present invention, after the prepared K-gold spring piece is cooled, annealing heating is performed at a temperature of about 450° C. to eliminate the internal stress generated in the K-gold spring piece during the preparation process.

[0137] In a specific embodiment of the present invention, the K gold spring is heat-treated at 330°C to 380°C for 0.5h to 1h to allow nickel, aluminum and silicon to react and precipitate Ni 3 Al, Ni 3 Si、Ni 2 Al, Ni 2 Si and Ni 5 Si 2 Any one or two or more intermetallic compounds in the K gold wire are deposited. At this time, the precipitated compounds are located on the surface of the K gold wire, and the precipitated compounds are hard and can improve the overall strength of the K gold wire.

[0138] In a specific embodiment of the present invention, after obtaining the K-gold shrapnel, the K-gold shrapnel is further bent according to the required shape. The K-gold shrapnel can be bent using a bending mold. Before bending, the bending mold and the K-gold shrapnel are preheated at a temperature of about 450°C and a heating time of about 15 minutes. Then, the K-gold shrapnel is placed on the bending mold, and then the K-gold shrapnel is bent using a bending machine. The bending angle is determined according to the required shape. After the bending process is performed once, the K-gold shrapnel after the first bending is kept at a temperature of 370°C to 380°C for 30 minutes to 45 minutes, and then rapidly cooled in water for quenching. The K-gold spring is heated at a temperature of 300°C to 320°C. Keep warm for 30min to 45min, and cool naturally to room temperature; then preheat the K gold spring and the bending mold after the first bending again, the preheating temperature is about 450℃, and the heating time is about 15min; then place the K gold spring on the bending mold, and then use the bending machine to perform a secondary bending treatment on the K gold spring, and the bending angle is determined according to the required shape; after the secondary bending treatment, keep the K gold spring after the secondary bending at a temperature of 370℃ to 380℃ for 30min to 45min, and then quench it in water; keep the K gold spring at a temperature of 300℃ to 320℃ for 30min to 45min, and cool it naturally to room temperature, so as to obtain the bent 18K gold spring.

[0139] The present invention is described in detail above in conjunction with the embodiments, and those skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute limitations of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. An 18K gold, characterized in that: The components include: Gold 75.3% ~ 76.3%; Silver 5.1% to 9.5%; Copper 4.5% to 10%; Nickel 1.5% to 3.5%; Aluminum 0.3% to 2.5%; Silicon 0.2% to 0.9%; Titanium 1.3% to 1.5%; Iron 0.4% to 1%; Lanthanum 0.5% to 0.7%; Chromium 0.5~0.6%.

2. The 18K gold according to claim 1, characterized in that: It also includes 0.4% to 0.5% cobalt and 0.3% to 0.4% ruthenium.

3. A method for making an 18K gold spring, characterized in that: The steps include: Providing the 18K gold raw material as claimed in claim 1, and melting and casting the provided 18K gold raw material to obtain a K gold ingot; Tempering the K gold ingot and cold rolling it into K gold wire; Tempering the K gold wire and cold drawing it into K gold wire at room temperature; Heat the K gold wire at 330℃~380℃ for 0.5h~1h; The heat-insulated K gold wire is wound into a K gold spring.

4. The method for making an 18K gold spring according to claim 3, characterized in that: When providing 18K gold raw materials, nickel, aluminum and silicon in the 18K gold raw materials are pre-smelted into alloy particles; The alloy particles are then mixed and melted with the remaining components of the 18K gold raw material.

5. The method for making an 18K gold spring as claimed in claim 4, characterized in that: Pre-melting nickel, aluminum and silicon into alloy particles includes the following steps: Put nickel and silicon into a vacuum melting furnace to melt and mix them evenly; The temperature of the vacuum melting furnace is adjusted to 700°C ± 50°C, and aluminum is put into the vacuum melting furnace to be melted and mixed evenly; The temperature of the vacuum melting furnace is raised to 1300°C ± 50°C and the mixture is mixed uniformly to obtain a molten alloy; pouring the alloy melt into water and cooling it to obtain alloy particles; The alloy particles are heat-treated at 330° C. to 380° C. for 5 to 50 minutes to obtain pre-smelted alloy particles.

6. The method for making an 18K gold spring according to claim 4 or 5, characterized in that: It also includes pre-smelting the titanium and chromium in the 18K gold raw material together with nickel, aluminum and silicon into alloy particles.

7. The method for making an 18K gold spring as claimed in claim 3, characterized in that: After the K-gold spring is wound, the K-gold spring is kept at a temperature of 370°C to 380°C for 30min to 45min, and then rapidly cooled in water for quenching; The K gold spring is kept at a temperature of 300° C. to 320° C. for 30 min to 45 min, and naturally cooled to room temperature, thereby obtaining an 18K gold spring.

8. An 18K gold spring, characterized in that: The 18K gold spring is manufactured by the manufacturing method of any one of claims 3 to 7.

9. A method for making an 18K gold shrapnel, characterized in that: The steps include: Providing the 18K gold raw material as claimed in claim 1, melting the provided 18K gold raw material and preparing a K gold shrapnel; The K gold shrapnel is heat-treated at 330°C to 380°C for 0.5h to 1h, thereby completing the production of the 18K gold shrapnel.

10. An 18K gold shrapnel, characterized in that: The 18K gold shrapnel is manufactured by the manufacturing method of claim 9.