CN102776407A - Gold alloy and preparation method thereof - Google Patents
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- CN102776407A CN102776407A CN2012102687175A CN201210268717A CN102776407A CN 102776407 A CN102776407 A CN 102776407A CN 2012102687175 A CN2012102687175 A CN 2012102687175A CN 201210268717 A CN201210268717 A CN 201210268717A CN 102776407 A CN102776407 A CN 102776407A
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Abstract
The invention provides a gold alloy and a preparation method thereof. The gold alloy comprises the following components by weight part: 60 to 70 parts of gold, 0.5 to 2 parts of platinum, 0.5 to 1 part of palladium, 11 to 17 parts of silver, 1 to 6 parts of zinc, 1 to 3 parts of nickel, and 11 to 14 parts of copper. According to the embodiment of the invention, the hardness of the gold alloy can be improved, the color of the gold alloy can be changed, and the preparation cost of the gold alloy can be reduced.
Description
Technical field
The present invention relates to the precious metal processing technique field, relate in particular to a kind of au-alloy and preparation method thereof.
Background technology
Au-alloy is as the existing very long history of the material of traditional mode of production gold ornament, and the au-alloy that is adopted of common thousand solid gold jewelries is the silver or the copper of adding 0.09% in 99.99% gold, and its gold content is at least more than 99.9%; Hardness is generally softer; The about 72.4HV1 of Vickers' hardness GB/T4340.1-1999, the about 68.9HRF of Rockwell hardness GB/T230.1-2004, the about 19.352g/cm3 of density GB/T1423-1996; Therefore thousand pure gold product easy deformation are not suitable for inlaying jewelry; And the color of thousand pure golds is yellow, in the white jewellery popular not enough fashion that seems today; In addition, thousand pure golds are because gold content is higher, and its preparation cost is also higher.
Summary of the invention
The problem that the present invention will solve provides a kind of au-alloy and preparation method thereof, can improve the hardness of au-alloy, changes the color of au-alloy, and reduces the preparation cost of au-alloy.
For solving the problems of the technologies described above, the objective of the invention is to realize through following technical scheme:
The embodiment of the invention provides a kind of au-alloy, and the component of this au-alloy is represented by weight, comprising:
60～70 parts gold, 0.5～2 part platinum, 0.5～1 part porpezite, 11～17 parts silver, 1～6 part zinc, 1～3 part nickel and 11～14 parts copper.
The embodiment of the invention also provides a kind of preparation method of au-alloy, comprising:
Get the gold of 60～70 parts of parts by weight, 0.5～2 part platinum, 0.5～1 part porpezite, 11～17 parts silver, 1～6 part zinc, 1～3 part nickel and 11～14 parts copper;
With parts by weight is that 0.5～2 part platinum, 0.5～1 part porpezite, 1～3 part nickel are put into molten gold pot, and this molten gold pot is heated;
After waiting to put into the whole fusings of metal of molten gold pot; In molten gold pot, putting into parts by weight is 60～70 parts gold, 11～17 parts silver, 1～6 part zinc and 11～14 parts copper; Molten gold pot is proceeded heating; Yellow gold and silver, zinc, the copper in molten gold pot, put into all melt, and obtain alloy solution;
Pour the alloy solution in the molten gold pot into graphite cuvette, cool off 20～30 minutes at normal temperatures after, put it into again and be cooled to normal temperature in the tank.
Because platinum or palladium after the high temperature melting, silver, zinc, nickel, copper play the effect of variable color to gold solution, make the au-alloy of processing be rendered as white in the au-alloy that the embodiment of the invention provides, therefore increased stylishness with respect to thousand pure golds; Simultaneously; Through detecting; The about 89.42HRB of au-alloy Rockwell hardness GB/T230.1-2009 that the embodiment of the invention provides, the about 193.57HV1 of Vickers' hardness GB/T4340.1-2009, the about 13.64g/cm3 of density GB/T1423-1996; It is thus clear that hardness is higher than the hardness of thousand pure golds, thereby improved the hardness of au-alloy; In addition simultaneously in the au-alloy that provides of the embodiment of the invention content of gold be about 60% to 70%, it is lower to compare thousand pure gold preparation costs.
Embodiment
To carry out clear, intactly description to the technical scheme in the embodiment of the invention below.Obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, the scope that all belongs to the present invention and protected.
Au-alloy provided by the invention comprises following embodiment:
Embodiment one,
The au-alloy that embodiment one provides, its component are represented by weight, are made up of following material:
60～70 parts gold, 0.5～2 part platinum, 0.5～1 part porpezite, 11～17 parts silver, 1～6 part zinc, 1～3 part nickel and 11～14 parts copper.
Enumerating embodiment in the face of embodiment one down describes:
Embodiment one,
The au-alloy that the embodiment of the invention one provides is made up of following material:
66.66 gold, 0.8335 part platinum, 0.8335 part porpezite, 13.336 parts silver, 3.334 parts zinc, 1.667 parts nickel and 13.336 parts the copper of part.
The au-alloy that this embodiment one provides, the weight percent of each component is:
Gold accounts for 66.66%, platinum accounts for 0.8335%, porpezite accounts for 0.8335%, silver accounts for 13.336%, zinc accounts for 3.334%, nickel accounts for 1.667%, and copper accounts for 13.336%.
In the embodiment of the invention,, come gold is changed color, make the au-alloy color that obtains be rendered as white, increased stylishness with respect to traditional yellow through in gold, adding platinum, palladium gold and silver, zinc, nickel, copper; Through detecting; The about 89.42HRB of au-alloy Rockwell hardness GB/T230.1-2009 that present embodiment provides; The about 193.57HV1 of Vickers' hardness GB/T4340.1-2009, the about 13.64g/cm3 of density GB/T1423-1996, the visible about 72.4HV1 of Vickers' hardness GB/T4340.1-1999 with respect to thousand pure golds; The about 68.9HRF of Rockwell hardness GB/T230.1-2004; The about 19.352g/cm3 of density GB/T1423-1996 has improved the hardness of au-alloy; In addition, gold accounts for 66.66% in au-alloy, has reduced the preparation cost and the cost of gold product, and simultaneously because 6 lucky meanings in traditional Chinese culture, 4 " 6 " more seem to have special meaning.
Embodiment one can also realize that experiment shows through following examples, the au-alloy that following embodiment provides, and color is a white, Vickers' hardness is greater than 72.4HV1; Rockwell hardness is greater than 68.9HRF; Density is less than 19.352g/cm3.
Embodiment two,
66.66 gold, 1 part platinum, 0.667 part porpezite, 13.336 parts silver, 3.334 parts zinc, 1.667 parts nickel and 13.336 parts the copper of part.
Embodiment three,
66.66 gold, 1 part platinum, 1 part porpezite, 12 parts silver, 5 parts zinc, 3 parts nickel and 11.34 parts the copper of part.
Embodiment four,
66.66 gold, 1 part platinum, 1 part porpezite, 11 parts silver, 6 parts zinc, 3 parts nickel and 11.34 parts the copper of part.
Embodiment five,
60 parts gold, 2 parts platinum, 1 part porpezite, 17 parts silver, 6 parts zinc, 3 parts nickel and 14 parts copper.
Embodiment six,
70 parts gold, 1 part platinum, 0.5 part porpezite, 11 parts silver, 1 part zinc, 6 parts nickel and 11 parts copper.
This embodiment provides the part embodiment of au-alloy, in concrete implementation process, according to the parts by weight scope of each component in the au-alloy, can also list other embodiment, here particularize no longer.
Embodiment two,
The au-alloy that embodiment two provides, its component are represented by weight, are made up of following material:
60～70 parts gold, 0.5～2 part platinum, 0.5～1 part porpezite, 11～17 parts silver, 1～6 part zinc, 1～3 part nickel and 11～14 parts copper and 1～10 part he Li Shi repaired mouth H-142 or H-310.
Wherein, congratulating Li Shi repaired mouth H-142 or H-310 is the blue or green red and bluish yellow look of two kinds of models, and model is that the repaired mouth color of H-142 is red for green grass or young crops, and the repaired mouth color of H-310 is a bluish yellow.
Enumerating embodiment in the face of embodiment two down describes:
Embodiment one,
The au-alloy that this embodiment one provides, form by following material:
66.66 the gold of part, 0.8335 part platinum, 0.8335 part porpezite, 13.336 parts silver, 3.334 parts zinc, 1.667 parts nickel, 12.336 parts copper and 1 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106.
The weight percent of each component is in the au-alloy that present embodiment one provides:
Gold accounts for 66.66%, platinum accounts for 0.8335%, porpezite accounts for 0.8335%, silver accounts for 13.336%, zinc accounts for 3.334%, nickel accounts for 1.667%, and copper accounts for 12.336%, congratulates Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106 and accounts for 1%.
In the embodiment of the invention; Through in gold, adding platinum, palladium gold and silver, zinc, nickel, copper and congratulating Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106 and come gold is changed color; Make the au-alloy color that obtains be rendered as white, increased stylishness with respect to traditional yellow; In addition; Through detecting; The about 89.42HRB of au-alloy Rockwell hardness GB/T230.1-2009 that present embodiment provides; The about 193.57HV1 of Vickers' hardness GB/T4340.1-2009, the about 13.64g/cm3 of density GB/T1423-1996, the visible about 72.4HV1 of Vickers' hardness GB/T4340.1-1999 with respect to thousand pure golds; The about 68.9HRF of Rockwell hardness GB/T230.1-2004; The about 19.352g/cm3 of density GB/T1423-1996 has improved the hardness of au-alloy.
Embodiment two can also realize that experiment shows through following examples, the au-alloy that following embodiment provides, and color is a white, Vickers' hardness is greater than 72.4HV1; Rockwell hardness is greater than 68.9HRF; Density is less than 19.352g/cm3.
Embodiment two,
66.66 gold, 1 part platinum, 1 part porpezite, 16 parts silver, 2 parts zinc, 1 part nickel and 12.24 parts the copper of part, and 1～10 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106.
Embodiment three,
66.66 gold, 2 parts platinum, 1 part porpezite, 15 parts silver, 2 parts zinc, 2 parts nickel and 11.24 parts the copper of part, and 1～10 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106.
Embodiment four,
66.66 gold, 1 part platinum, 1 part porpezite, 17 parts silver, 1 part zinc, 1 part nickel and 12.24 parts the copper of part, and 1～10 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106.
Embodiment five,
60 parts gold, 2 parts platinum, 1 part porpezite, 17 parts silver, 6 parts zinc, 3 parts nickel, 14 parts copper and 1～10 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106.
Embodiment six,
70 parts gold, 1 part platinum, 0.5 part porpezite, 11 parts silver, 1 part zinc, 6 parts nickel, 11 parts copper and 1～10 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106.
This embodiment provides the part embodiment of au-alloy, in concrete implementation process, according to the parts by weight scope of each component in the au-alloy, can also list other embodiment, here particularize no longer.
More than au-alloy that embodiment of the present invention is provided be described, embodiment of the present invention also provides the preparation method of au-alloy.
The preparation method of the au-alloy that embodiment of the present invention one provides comprises:
(1) getting parts by weight is 60～70 parts gold, 0.5～2 part platinum, 0.5～1 part porpezite, 11～17 parts silver, 1～6 part zinc, 1～3 part nickel and 11～14 parts copper.
(2) be that 0.5～2 part platinum, 0.5～1 part porpezite, 1～3 part nickel are put into molten gold pot with parts by weight, this molten gold pot is heated.
(3) all after the fusing, in molten gold pot, put into parts by weight is 60～70 parts gold, 11～17 parts silver, 1～6 part zinc and 11～14 parts copper to the metal of waiting to put into molten gold pot.
(4) molten gold pot is proceeded heating, gold, copper, silver, the zinc in molten gold pot, put into all melt, and obtain alloy solution.
The alloy solution that (5) will melt in the gold pot is poured graphite cuvette into, cool off 20 to 30 minutes at normal temperatures after, put it into again and be cooled to normal temperature in the tank.
The preparation method of the au-alloy that provides in the face of embodiment of the present invention one down, enumerate embodiment and describe:
Embodiment one,
The preparation method of the au-alloy that the embodiment of the invention one provides comprises:
(1) getting parts by weight is 66.66 parts gold, 1 part platinum, 1 part porpezite, 11.34 parts silver, 5 parts zinc, 2 parts nickel and 13 parts copper.
(2) the various metals that will get are respectively put into the beaker that zero(ppm) water is housed and are boiled 10 minutes except that degreasing.
Wherein, also can respectively the various metals of getting be put into the beaker that zero(ppm) water is housed and boil 12 or 15 minutes except that degreasing.
(3) will remove the smeary metal respectively and in beaker, take out cleaning, drying, put into clean utensil.
(4) be that 1 part platinum, 1 part porpezite, 2 parts nickel are put into molten gold pot with parts by weight, this molten gold pot is heated.
(5) all after the fusing, in molten gold pot, put into parts by weight is 66.66 parts gold, 11.34 parts silver, 5 parts zinc to the metal of waiting to put into molten gold pot, and 13 parts copper.
(6) molten gold pot is proceeded heating, yellow gold and silver, zinc, the copper in molten gold pot, put into all melt, and obtain alloy solution.
The alloy solution that (7) will melt in the gold pot is poured graphite cuvette into, cool off 25 minutes at normal temperatures after, put it into again and be cooled to normal temperature in the tank.
Wherein, also can pour the alloy solution that melts in the gold pot into graphite cuvette, cool off at normal temperatures 20 minutes or 30 minutes.
Wherein, graphite cuvette is rectangular groove.
Experiment shows; Adopt the au-alloy of this embodiment preparation; Because the platinum after the high temperature melting, palladium gold and silver, zinc, nickel, copper play the effect that changes color to gold solution, make the au-alloy of processing be rendered as white, therefore increased stylishness with respect to thousand pure golds; Through detecting; The about 89.42HRB of au-alloy Rockwell hardness GB/T230.1-2009 that the embodiment of the invention provides, the about 193.57HV1 of Vickers' hardness GB/T4340.1-2009, the about 13.64g/cm3 of density GB/T1423-1996; It is thus clear that hardness is higher than the hardness of thousand pure golds, thereby improved the hardness of au-alloy; In addition, gold accounts for 66.66% in au-alloy, has reduced the preparation cost and the cost of gold product, and simultaneously because 6 lucky meanings in traditional Chinese culture, 4 " 6 " more seem to have special meaning.
Wherein, platinum can be replaced with the palladium of identical weight umber.
It is understandable that in the practical implementation process, the au-alloy that provides according to other embodiment in the embodiment of the present invention one, and the TR in the preparation process, time range can also be listed other embodiment, repeat no more here.
The preparation method of the au-alloy that embodiment of the present invention two provides comprises:
(1) getting parts by weight is 60～70 parts gold, 0.5～2 part platinum, 0.5～1 part porpezite, 11～17 parts silver, 1～6 part zinc, 1～3 part nickel and 11～14 parts copper, 1～10 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106.
(2) the various metals that will get are respectively put into the beaker that zero(ppm) water is housed and are boiled 10 to 15 minutes except that degreasing.
(3) will remove the smeary metal respectively and in beaker, take out cleaning, drying, put into clean utensil.
(4) be 0.5～2 part platinum, 0.5～1 part porpezite, 1～3 part nickel with parts by weight, 1～10 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106 heat this molten gold pot.
(5) all after the fusing, in molten gold pot, put into parts by weight is 60～70 parts gold, 11～17 parts silver, 1～6 part zinc and 11～14 parts copper to the metal of waiting to put into molten gold pot.
(6) molten gold pot is proceeded heating, yellow gold and silver, zinc, the copper in molten gold pot, put into all melt, and obtain alloy solution.
The alloy solution that (7) will melt in the gold pot is poured graphite cuvette into, cool off 20 to 30 minutes at normal temperatures after, put it into again and be cooled to normal temperature in the tank.
The preparation method of the au-alloy that provides in the face of embodiment of the present invention two down, enumerate embodiment and describe:
Embodiment one,
The preparation method of the au-alloy that the embodiment of the invention one provides comprises:
(1) getting parts by weight is 66.66 parts gold, 1 part platinum, 1 part porpezite, 12 parts silver, 4 parts zinc, 1 part nickel and 13.34 parts copper, 1 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106.
(2) the various metals that will get are respectively put into the beaker that zero(ppm) water is housed and are boiled 10 minutes except that degreasing.
Wherein, also can respectively the various metals of getting be put into the beaker that zero(ppm) water is housed and boil 12 or 15 minutes except that degreasing.
(3) will remove the smeary metal respectively and in beaker, take out cleaning, drying, put into clean utensil.
(4) be that 1 part platinum, 1 part porpezite, 1 part nickel, 1 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106 are put into molten gold pot with parts by weight, this molten gold pot is heated.
(5) all after the fusing, in molten gold pot, put into parts by weight is 66.66 parts gold, 12 parts silver, 4 parts zinc and 13.34 parts copper to the metal of waiting to put into molten gold pot.
(6) molten gold pot is proceeded heating, yellow gold and silver, the zinc in molten gold pot, put into all melt, and obtain alloy solution.
The alloy solution that (7) will melt in the gold pot is poured graphite cuvette into, cool off 25 minutes at normal temperatures after, put it into again and be cooled to normal temperature in the tank.
Wherein, also can pour the alloy solution that melts in the gold pot into graphite cuvette, cool off at normal temperatures 20 minutes or 30 minutes.
Wherein, graphite cuvette is rectangular groove.
Experiment shows; Adopt the au-alloy of this embodiment preparation; Because the platinum after the high temperature melting, palladium gold and silver, zinc, nickel, copper and he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106; Gold solution is played the effect that changes color, make the au-alloy of processing be rendered as white, therefore increased stylishness with respect to thousand pure golds; Through detecting; The about 89.42HRB of au-alloy Rockwell hardness GB/T230.1-2009 that the embodiment of the invention provides, the about 193.57HV1 of Vickers' hardness GB/T4340.1-2009, the about 13.64g/cm3 of density GB/T1423-1996; It is thus clear that hardness is higher than the hardness of thousand pure golds, thereby improved the hardness of au-alloy; In addition, gold accounts for 66.66% in au-alloy, has reduced the preparation cost and the cost of gold product, and simultaneously because 6 lucky meanings in traditional Chinese culture, 4 " 6 " more seem to have special meaning.
In the present embodiment, platinum can be replaced with the palladium of identical weight umber.
It is understandable that in concrete implementation process, the au-alloy that provides according to other embodiment in the embodiment of the present invention two, and the TR in the preparation process, time range can also be listed other embodiment, repeat no more here.
More than embodiment provided by the present invention has been carried out detailed introduction, used concrete example among this paper principle of the present invention and embodiment set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. an au-alloy is characterized in that, the component of said au-alloy is represented by weight, comprising:
60～70 parts gold, 0.5～2 part platinum, 0.5～1 part porpezite, 11～17 parts silver, 1～6 part zinc, 1～3 part nickel and 11～14 parts copper.
2. au-alloy according to claim 1 is characterized in that, the weight percent of each component is in the said au-alloy:
Gold accounts for 66.66%, platinum accounts for 0.5～2%, porpezite accounts for 0.5～1%, silver accounts for 11～17%, zinc accounts for 1～6%, nickel accounts for 1～3%, and copper accounts for 11～14%.
3. au-alloy according to claim 2 is characterized in that, the weight percent of each component is in the said au-alloy:
Gold accounts for 66.66%, platinum accounts for 0.8335%, porpezite accounts for 0.8335%, silver accounts for 13.336%, zinc accounts for 3.334%, nickel accounts for 1.667%, and copper accounts for 13.336%.
4. au-alloy according to claim 1 is characterized in that, also comprises:
1～10 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106.
5. the preparation method of an au-alloy is characterized in that, comprising:
Get the gold of 60～70 parts of parts by weight, 0.5～2 part platinum, 0.5～1 part porpezite, 11～17 parts silver, 1～6 part zinc, 1～3 part nickel and 11～14 parts copper;
With parts by weight is that 0.5～2 part platinum, 0.5～1 part porpezite, 1～3 part nickel are put into molten gold pot, and this molten gold pot is heated;
After waiting to put into the whole fusings of metal of molten gold pot; In molten gold pot, putting into parts by weight is 60～70 parts gold, 11～17 parts silver, 1～6 part zinc and 11～14 parts copper; Molten gold pot is proceeded heating; Yellow gold and silver, zinc, the copper in molten gold pot, put into all melt, and obtain alloy solution;
Pour the alloy solution in the molten gold pot into graphite cuvette, cool off 20～30 minutes at normal temperatures after, put it into again and be cooled to normal temperature in the tank.
6. method according to claim 5; It is characterized in that; The said gold of 60～70 parts of parts by weight, 0.5～2 part platinum, 0.5～1 part porpezite, 11～17 parts silver, 1～6 part zinc, 1～3 part nickel and 11～14 parts the copper got also comprises:
Get parts by weight and be 1～10 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106;
Said is that 0.5～2 part platinum, 0.5～1 part porpezite, 1～3 part nickel are put into molten gold pot and also comprised with parts by weight:
With parts by weight is that 1～10 part he Li Shi repaired mouth H-142 or H-310 or golden warrier's repaired mouth 1106 put into molten gold pot.
7. according to claim 5 or 6 described methods, it is characterized in that said is that 0.5～2 part platinum, 0.5～1 part porpezite, 1～3 part nickel are put into molten gold pot with parts by weight, before this molten gold pot is heated, also comprises:
The various metals that to get are respectively put into the beaker that zero(ppm) water is housed and are boiled 10 to 15 minutes except that degreasing;
To remove the smeary metal respectively and in beaker, take out cleaning, drying, put into clean utensil.
8. according to claim 5 or 6 described methods, it is characterized in that said graphite cuvette is rectangular groove.
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| CN106676368A (en) * | 2015-11-05 | 2017-05-17 | 尼瓦洛克斯-法尔股份有限公司 | Method for manufacturing gold alloy wire |
| CN106676368B (en) * | 2015-11-05 | 2018-09-18 | 尼瓦洛克斯-法尔股份有限公司 | The manufacturing method of golden alloy wire |
| CN111819299A (en) * | 2018-03-15 | 2020-10-23 | 瑞士贺利氏公司 | Gold alloy with color meeting 5N standard and production method thereof |
| US11725257B2 (en) | 2018-03-15 | 2023-08-15 | Argor-Heraeus Sa | Gold alloy with color compatible with the 5N standard and method of production thereof |
| CN108922876A (en) * | 2018-06-27 | 2018-11-30 | 汕头市骏码凯撒有限公司 | A kind of billon bonding wire and its manufacturing method |
| CN108922876B (en) * | 2018-06-27 | 2020-05-29 | 汕头市骏码凯撒有限公司 | Gold alloy bonding wire and manufacturing method thereof |
| CN109022890A (en) * | 2018-09-20 | 2018-12-18 | 张家港市勇峰精密机械有限公司 | A kind of corrosion-resistant auri precision hardware material |
| CN109913688A (en) * | 2019-04-11 | 2019-06-21 | 深圳市甘露珠宝首饰有限公司 | Billon and preparation method thereof |
| CN115558822A (en) * | 2022-07-19 | 2023-01-03 | 朱言军 | Novel gold-silver alloy material and preparation method thereof |
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